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Old 02-03-2010, 01:16 AM   #1
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Default Gp rv-4 40 sport kit

hello all here at wf,i enjoy building alot and posting them.so here goes a greatplanes rv-4 40. i build very fast so do'nt exspect this bird will take more than 3 or 4 weeks.between cardiac rehab and buildingplanes ,not much else to do to weather the winter.
heres a few pictures and i won't bore ya all with idle chatter...lol...


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Old 02-03-2010, 03:55 AM   #2
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Looks like a fun build. Good luck on your build and rehab!!!

Visit my homepage! Have A Good One!

Robert
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Old 02-07-2010, 10:04 PM   #3
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long week guys sorry for the delay on going foward,should be moving along now that the swelling of my cheek has gone down. had a tooth pulled and a implant done and the pain and swelling was a bad trip....lots of ice for the last 48hrs and a few vicodens to ease the pain.

good news is i'll be building more now and i got the parts sorted and the tail sections started.heres a few pics .
hope everyones dug out of the snow on the east coast and that spring arrives real soon!!!!!!!!


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Old 02-08-2010, 12:58 AM   #4
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Good luck, what electronics are you using?

Hanger: GWS Slow Stick; Nutball
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Old 02-08-2010, 01:12 AM   #5
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turnigy 50-55-580kv sk series,turnigy 85ampesc with 4ampbec,2 3cell 4000mah zippyflightmaxs run in series=6cell4000mah,13x6apc e prop.all servos will be hs485's[4]

i'm looking foward to trying the new 85amp esc....i also used this motor in a extra300s gp,and the sig hog bipe.plenty of power!!but in those i used the sentilon 100amp esc.

the 50-55-580 calls for a 80ampesc.......hummmmm,hope the 85 does the trick.
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Old 02-10-2010, 12:39 AM   #6
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Ok, cool!

Hanger: GWS Slow Stick; Nutball
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Old 02-10-2010, 10:49 PM   #7
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lots of snow ,and alittle building .
second winghalf started and i really don't care to much for the design greatplanes put in for wing assembly.

it's very strong using 3/32 balsa sheeting ,1/8 ribs and the long bracing pc that holds ribs in place also is the sheerweb down the whole length of the wing and its also 1/8" balsa.

hoping theres no twists in the first half i built and if the is i'll sort it all out before joing the halfs. just 2 pictures as not much done and lots of shapping to still be done.

also thinking of ditching the plastic wing tips for shaped balsa,might leave the wing tips semi flat for easyer covering....plenty of time to decide.
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Old 02-10-2010, 10:52 PM   #8
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again forgot the pictures....i'm getting old...lol..


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Old 02-12-2010, 01:46 AM   #9
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hi all who like building,got the wing halves joined today,posting pictures to show the dihedral brace that gp use's and you dont weight one side down on the build table a lift the wing tip of the otheron a block.instead i epoxied the brace on one half and then epoxied the 2 halves together with epoxy.

i will say that the brace was very easy to use and both wing halves joined perfectly,very solid wing design .ya just need to except the design differences and at the end of the day the wing is great!very happy with the end results.
so just a few pics to show the brace installed.next will be the ailerons and flaps.
the best part of any build for me is the fuse as thats where the electric mods will begin...


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Old 02-16-2010, 03:50 AM   #10
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just a few....and only a little building done over the last few days.

wing needs some serious sanding/putty and the ailerons and flaps are hinged in, that came ok nice as this is only the second time i'v used the hobbico slot cutter.wish i'd bought one long ago.servo bows done.just need to laminate 1/4"sheets of balsa to fabricate my own wing tips as i don't want to use the plastic ones.

started the fuse,now to work out the electrics...i love this part!!!!!


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narrow is the place to land...wide is the space to crash....choose the narrow way!
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Old 02-16-2010, 11:07 PM   #11
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fuse bottom is complete,if i have anything to say today,it would bee the ply formers fit perfectly. one of the nicest fuse to build and by the time the firewall went in it wound up the 90degs to the fuse right on...

the last picture is to show where the batteries will have to go and the bottom of the cowel will have a significant pcs cut away to build the battery hatch and box. i will do this like i did on the gp extra.

i'll pull it down from the ceiling hanger when theres more space and take a few pics of its layout for batts.


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narrow is the place to land...wide is the space to crash....choose the narrow way!
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Old 02-19-2010, 11:41 PM   #12
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hello to any intrested in this build,i love building ...maybe more than flying.
hummmmmmm, nah! i love doing both.

today was a busy one and only went into the shop to kick around.
so i finnished the turtle deck and cockpit area.used elmers glue with balsa dust to fill small gaps and sanded some more on the wing .

this bird seems like i need to keep sanding ....

next on the list is my least favorite part ,to join the nose cowel halves which looks to be fiberglass ,not just plastic like the wheel pants halves.
then it onto a basic assembly of all parts,pushrods,motor mount and the battery box with easy loading design.one thing i like is the wires from motor to esc and esc to battery won't require any added lengths of wire.i will use deans connectors and incorperate a arming plug out of deans plugs.to load the batts i'll turn the plane over on a reg plane holder.the arming plug will be mounted on the fuse side with the the rx switch this is so i'll be ready to go once the flight line opens up....
just a temp pulling pcs together pictures,


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narrow is the place to land...wide is the space to crash....choose the narrow way!
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Old 02-23-2010, 11:30 PM   #13
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AAAARRRRRRRGGGGGG! there now thats out of my system.

assembled the motor,esc,rx on the build table....plug it in for test on motors direction and pluged the esc in right the first time.

at throttle up all sounded good till 1/2 throttle then the vibrations started.stopped the test to hear grinding sounds inside the motor and no longer spun freely.REJECTED!!!!

once again i have to send a motor back do to poor quality control.this same motor 50-55-580 had issues back in the spring of 2008.hobbycity wrote a answer that the manufacture had not cleaned oil properly off the bell housing and magnets were coming loose.replacement motor runs great,as does the motor i put in the hog bipe.[both 50-55-580's]

it'll take months to get the replacement motor and i'll be covering the rv soon....,may have to order a new motor and wait for the replacement as a standby......that stinks!!!!oh well ,all part of the hobby,we all deal with china...lol....:o

thanks for reading this sad post for the day complete with pictures.i feel better just venting....lol,stu

just noticed ,this is my 13th post on this build....good thing i don't believe in luck,or the only luck i'd have is badluck...lol


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narrow is the place to land...wide is the space to crash....choose the narrow way!
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Old 03-31-2010, 11:38 PM   #14
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ok then....thats enough time off building the rv-4......

today i sandeed the bevels on the ailerons,rudder,elevator and started to shape the wing tips with built up balsa as the plastic wing tips are not going to hold up to any wing tip touches.....not that i ever touch the wing tips on landings:o[lie].

the next step was centering the wing to the fuse and making sure the wing is set right before drilling the holding holes for the plastic bolt.

put the wing in what appeared center front to back and used a ruler to measure at the wing tips and the rear of the fuse to get equ/equ ...only i'm not getting it....3/16"off and if i make it right the root of the wing on the te is off center.....the front ply peg thats supposed to be center as the wing is built in 2 halves and joined together looks a lil off.

i'll shim a lil here and a lil there to get within a 1/16"and call it set!!!perfection is'nt always possible...lol...but ocd wants to get it that way.[note,all measurement on the wing were right on for left side to right sidenot sure where its going wrong]

tomorro i'l set the tail fillets that go on and then its time to final sand everything using the light weight spackel to smooth thing out.

pics tomorro ....

narrow is the place to land...wide is the space to crash....choose the narrow way!
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Old 04-01-2010, 12:28 AM   #15
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go figure...i started dinner for the kids and i and went down to the shop to see how shimming the front peg worked out....100%right on.

so heres a few pics as promised.....elev and rudder assembly is held in place with 1 pin for these shots...looking foward now to tomorros fitting the tail section.

to all,a good night!stu


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Old 04-01-2010, 12:33 AM   #16
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Will be watching! Best of luck with your efforts... both of them!

Former Formula Ford and F2000 Piloto

Thats my Dad and me in the avatar... he built mostly, I flew mostly... Miss You Dad!
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Old 04-01-2010, 04:13 PM   #17
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Hi Stuart
One I fancied myself here. I think I was one of the first to electrocute a Great Planes kit - did their then-new CAP 232 back in the last century. I met up with the kit's designer, Mike Cross, and got to see him fly his own prototype model. Was hooked.

Let's not discuss that a CAP 232 at over 6lbs with a 44oz battery on board has a tendency to snap roll if the pilot even thinks about snap rolling... Otherwise, it was a fun model and possibly still exists somewhere in MD. SOmetimes I wish I'd stashed it - would be fun on LiPo battery power vice nicads.

You're doing well on your RV. By the time I was done with the CAP, the only bits left from the kit were the cowl and rudder - I'd sort of re-designed the inside bits a little. Started by changing the mainspars - mine weighed 2oz vs the kit's at 4oz.

There's good reason why I don't build many kits or other people's plans

You putting a battery hatch on the fuselage topside? It's a real pain if you can't access your pack and this is too nice a model to risk charging a lipo inside of it.

Motors - there's reason cheap junk is cheap. I started in high power electrics with Tom Cimato's MaxCims on geardrives and have had an AXI outrunner since well before they made it to the US. Can beat them into the ground and they keep on delivering. Cheap c#@p is fine for little low stress parkfliers, but not for a big higher powered model like this with lots of time, money and effort involved.

Looking forwards to seeing how this one goes. It's a neat model and GP models all fly well - shame they don't seem able to spell 'light weight', but you can't have everything When you're done, you'll know which is yours in the pits too!

Good luck

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Old 04-29-2010, 01:17 AM   #18
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thanks dereck,its been fun up till now.........what was i thinkingi had several rolls of monocoat and decided to use them......................................

the new monocoat is n't like it used to be,very hard to work with and requires so much more heat to shrink than i remember ever using before.

the cub yellow had flaws in the color,the first half went perfect,second half had light yellow streaks after shrinking it.....peeled it off and did it again...looks better but still flaws.

1st half of the blue went perfect...second half of the blue was doing ok but i burnt a small hole shrinking it,thats my fault for stopping the heat gun instead of keeping it moving like i normally do.....

now i have to decide ,do i peel off the damaged covering or find some cleaver way to decal it.....,i like idea # 2.

i still need to use the yellow on all bottom surfaces and blue on the top of the ailerons.

then I'm switching to ultracoat white for the fuse on the top surfaces of the elev/rudder areas.

i hope to wrap this bird up as its been way to long sitting without me working on it.....its gettin old if ya know what i mean.

I'll post the rest of the covering and hope to have better things to say about the monocoat colors.

stu


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narrow is the place to land...wide is the space to crash....choose the narrow way!
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Old 04-29-2010, 02:37 AM   #19
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stuart,

Glad to see you are still working on this. The real RV-x planes are some of my favorites. I've never used monocoat ultracoat, so I can't help you there. (Microlte/Solite only so far)

I do like your color choice. Bright and easy to see, yet lots of contrast for up and down. All good things!

Did you get your new motor yet?

Steve

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Old 04-29-2010, 03:03 AM   #20
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hello steve,i did get the replacement motor,the 50-55-580kv.i already have 2 of these motors in a hog bipe,and gp extra.i think i'll keep it as a replacement for those planes if needed.

i already installed the gold turnigy 50-55-400 and plan on using a 14x6 size apc e prop on the rv4.

the monocoat was dissappointing in its quality,but i'll finnish up with it and hope it looks good when all said and done.the mian reason i used it was because monocoat self stick trim sheets match color perfectly.i got 3 sheets of blue to use on the rudder /elev tips.

ultracoat is a much better film covering,shrinks quickly with much less heat. also ultracoat reshrinks very well.i just had 3 rolls of the mono to use when i rebuild the uproar.....yellow /red/white stand out fantastic when rolling high up,i tend to need the bright colors...lol.

i really need to fix the lines on the le where the blue meets yellow on the wing,possibly by using white pin striping .the kind used on autos is very strong ,very thin,and will also shrink with heat.i can do it to make the edges look equale and even it out

anyway,i'll hopefully get everything covered and together this weekend as my better half has a conference to go to till sunday......still,lots of time to finnish up.

stu

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Old 04-30-2010, 03:48 AM   #21
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well,today i'm thrilled with the cleanup of the wing,i covered the flaps and ailerons pinstiped the lines where blue meet yellow with a white strip.

also cleaned up to top surface patched the burn hole,wiped it down with aceton after ca'ing the flaps/ailerons in. had to strip the right side aileron due to its size not matching the flap....all part of a days work on the table. lifes to short to build ugly planes.

switched to white ultracoat for the rudder/elev areas and the yellow monocoat went on real nice .heat gun can really shrink the ultracoat fast and not burn thru....used the exact touch on the yellow mono and burned a hole instantly...monocoat stinks!!!!!!
my iron broke tonight so it off to the lhs friday and more progress then.

good night to all ,see ya in the morning.

stu


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narrow is the place to land...wide is the space to crash....choose the narrow way!
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Old 05-01-2010, 02:07 AM   #22
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had a great morning flying,got a new sealing iron....what could make this day any better?

got to build the rv a little more. all surfaces are glued in and moving freely. next step is the servoes and wire everything into place.

i still have to figure out what channel the flaps go on:o,never had flaps before and i know the hitec optic 6 has a separate setting for flaps. they will require set end points I'm sure so they don't bind in the up position and i am hoping someone here will throw me a few pointers on setting up flaps. i will be checking out the instructions on the hitec tx later.

just a couple pics....i had more as i was covering ...but the memory card wasn't in the camera,it was in this laptop....dohhhhhh.......

stu


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narrow is the place to land...wide is the space to crash....choose the narrow way!
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Old 05-04-2010, 05:52 PM   #23
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finished at last! these are the last pictures of the RV. at least until i maiden it hopefully this week.

through in a few shots of the bottom feed battery compartment. it hold the 2 3cell4000mah zippies snug and its overkill in stength....this explains why i needed 2 oz weight in the tail. the esc has built in 4amp bec,so theres no rx battery to move around.using a 14x7e prop and theres deff vertical lift with 6cells.might drop down to 13 x 6 as i still need to watt/amp test this setup.

i will dress this bird up some more once I've flown it to be sure alls well in the handling dept..lol.... the flaps are on the gear switch and the end point adjustment are set so the throws of the servos don't go near max throw.


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narrow is the place to land...wide is the space to crash....choose the narrow way!
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Old 01-20-2012, 03:40 AM   #24
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thread back from the dead........

this rv4-40 has flown several times and handles ok,but from day one i hated the build design of the wing ,and the warp i had caused the trim adjustment to have the ailerons out of position after landing. one high,other low just to fly straight. i wound up putting this bird in the corner of the basement looking pretty but no place to go since the ailerons/warped wing pissed me off to much to fly that way. i purchased another kit to rebuild a new wing ,but never got to it till now.

so for the sake of closer,I'll post a rebuild of this very strange wing build design by great planes and hope to have it done for spring time weather.

the wing tips will be "clipped" since the plastic tips look and fit poorly,also the final 2" will be made from balsa block hollowed out to get the shape and strength for those wing tip touches on hairy landings. i am also considering doing away with the flaps for extra long ailerons.[should increase roll rate] I'll decide that later since this bird landed fine with out my using the flaps. ultimately i want a fun to fly plane with no fuss......and no more hanger dust collector.

pictures to follow this weekend. one note,on rcu theres a build thread that collaborates the pain to build wing design...i hope to succeed this time by studying the build sequence before blindly following the instruction book.

narrow is the place to land...wide is the space to crash....choose the narrow way!
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Old 01-20-2012, 12:09 PM   #25
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I have an modified E-FLite RV-9 and it flies like a dream. A lot of fun with good aerobatic capabilities. It slows down nice for landing. I have never seen a low wing semi-sym land so slowly and more like a cub. This is what the full size RV's are known for, a wide performance envelope. It looks like the GP version is a little overbuilt like a lot of nitro conversions.

I have been looking for a decent RV-4 or RV-8 that is at least 50" span but preferably larger that is not too heavy. I have not found one yet.

Keep after your RV and see if you can get it to behave, they really are fantastic when they fly like the real RV. I live and fly right down the way from the original RV factory in North Plains Oregon. I flew full scale for a time and had the pleasure of flying in one and they are awesome. Pilots love them because they will land and take off short and docile but will fly very fast and nimble. In the air they remind me of a well tuned and setup sports car.



Dave

"Gravity: Natures way of telling you to watch your airspeed"
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