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Old 11-05-2009, 04:38 AM   #1
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Build Review Hangar 9 RV-8 EP Build

After enjoying the E-flite RV-9, I decided to get something similar yet larger. I just picked up the Hangar 9 RV-8. This is my first ARF from Hangar 9 and will be the largest in my fleet. I just unpacked it and checked the contents - quite happy as everything is mint All the fragiles are individually wrapped and secured. The covering is excellent, better than I have ever seen from E-Flite out of the box. I flipped through the manual and it seems completely logical thus far. I took a few pics, and may start in on it tonight.

I will be using mostly the recommended gear, here is my config:

E-Flite Power 46
Castle Phoenix 60 and CC-BEC
6x JR DS821 digital sport servos
JR R921 RX with 4th. receiver

Will be flown with X9303 so should have 2048 resolution w/the R921. I bench tested everything and was surprised at how smooth and accurate the servos are.

I have yet to crack open the hardware kit tho it all looks proper. This was meant to be either a slimer or an EP so it's sturdy I'm sure.

All control surfaces are pre-hinged with control horns attached.

Anyway, I'll update later if anyone has any questions or wants specs just reply.


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Old 11-06-2009, 08:10 AM   #2
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Cool Progress update

Well so far this has been a smooth and enjoyable ARF build. I've got the radio gear installed along with R and E servos and linkage. First time I've had a pull / pull w/cable for the rudder. Also the elevator is dual halves. Opted out on the wheel pants as my field is bumpy. Horiz. stab installed smoothly w/the joining tubes and 30 min. epoxy. Starting in on servo and linkage installation in the wing panels.

There is plenty of room inside - a joy to deal with. RX is mounted with pins up directly above the wing tube, to allow for the lipo. The first satellite RX is on a 6" lead up near the front of the fuse. The other is 12" away in the back.

The motor mount template is sweet, you tape it in place then pin drill a pilot hole for drilling them out.

All the hardware needed is included and high-qual IMHO.


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Old 11-06-2009, 01:25 PM   #3
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I hear you on the two piece landing gear, I dont know why anyone would do this on a kit. One thing I have done is fabricate an aluminum or fiberglass plate that spans the width of the gear on the fuse so they are at least tied together. It seems to work for my fathers hard landings but is not ideal. It is a rather ugly solution however.
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Old 11-06-2009, 09:37 PM   #4
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Yup, I suspect it's that way for looks. I was considering a mod. such as what you have done, but decided to take my chances on this one. Slight bummer though as the 2-piece solution has bitten me more than once. Plus this bird will be a bit hefty all-up.

Weather is overcast and raining here, plus work is slow So I will continue to work away and will update later on. Thanks for checking out the build!

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Old 11-06-2009, 09:47 PM   #5
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One thing I just thought of, is there enough room to have a similar piece of aluminum or fiberglass spanning the distance inside the fuse? This would provide similar strength without being seen.
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Old 11-06-2009, 09:50 PM   #6
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I just looked at the pic of the front of the fuse. It looks like you can just use long bolts for the existing gear then make a piece with the same bolt pattern on each side and bolt it in. Just a thought.
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Old 11-06-2009, 09:52 PM   #7
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Not a bad idea at all! What material would be best though - wondering if I could get flat carbon fiber that wide. Hrmm.

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Old 11-06-2009, 10:05 PM   #8
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You can get carbon sheet that big, it will be costly though. Im assuming your plane is less than 12" wide so a 12"x12" sheet should be big enough. I would look at G10 fiberglass sheet. Its relatively inexpensive and I dont think carbon will be any better for this application. I would think 1/8" would be plenty thick but you can get up to 1/4" readily. G10 can be had from any high powered rocketry webstore as G10 is our fin material of choice.
http://blastzone.com/performancehobb...32902122304585
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Old 11-06-2009, 10:14 PM   #9
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Thanks for the info! I'll look into that fiberglass sheet solution. Yes at it's widest point the fuse is roughly 9" wide so that should be just fine.

Hang on a tick while I apply some science...

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Old 11-06-2009, 10:16 PM   #10
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This is not a gripe - more of a LOL situation.

When the RV-9 shipped the manual referenced pre-installed pull strings for the wing servos which were not there.

A certain person @ Horizon had noted that will never happen again.

Well, it did happen again, with the RV-8.

A totally simple task of course, a lead weight and some fishing line.

Still, I think it's funny

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Old 11-07-2009, 12:35 AM   #11
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Cool Progress update

OK so next was the canopy installation. This took alot of time and patience. It's cut out of the giant mold then trimmed with hobby knife then sanded. It's curing with good old formula 560. Wings are nearing completion.


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Old 11-11-2009, 06:39 AM   #12
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Cool Progress update

Got some more work done. The motor bolts right up with the included standoffs. I used a hand drill to enlarge the pilot holes I had made using the template. You do need to drill out the x-mount holes to about 4.5mm to allow for the bolts.

The cowl was a total pain though it's done now. Manual states use a hobby knife to cut it out - um ya this is fiberglass. I used a rotary tool to drill a few holes then routed it out and sanded down.

Tomorrow I'll deal with cutting out the cooling holes in the motor mount.


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Old 11-13-2009, 05:43 AM   #13
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Cool It's done!

Well, she's all done and looking good! The wings finished up easily. I cut out the cooling holes in the firewall and mounted the ESC & BEC. Cowl lines up nicely and the spinner looks good. Just needs a balanced prop! I cleaned up the wiring inside as best I could with wire keeps, it's still messy but functional. I did the radio programming - 3 position flaps, dual ailerons w/differential, etc. and throws are set. Hoping to maiden this weekend.


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Old 02-15-2010, 03:34 AM   #14
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Cool Finally maidened the RV-8 !!

Well yesterday I finally took the RV-8 out for maiden. Wired up a parallel harness and used 2x 2500 30C 4s eXcite lipos for good capacity. C/G was insane to fix - ended up having to get the lipos _all_ the way forward behind the tray and into the firewall! it was safe though and worked just fine. I think I will need to buy a couple big lipos for this one.

The Du-Bro spinner was rubbing on the cowling so I didn't fly with it.

I used an APC 13 x 8 and it had authority throughout the throttle range.

Did some final pre-flight work, popped in the EagleTree logger and the JR flight log.

Took it up, nice straight rollout w/little right rudder, excellent climbout, brought it around and started to trim. 1 click down elevator and 3 clicks right aileron. Dialed!

It will cruise around scale-like @ 1/2 throttle but watch for tip stalls if the angle of attack is too much. The power 46 hauls it around nicely, I bursted to WOT a couple times. I pushed it around the pattern in simple manuevers like slow rolls, large inside loops, a bit of inverted, etc. and it flew great.

Have not reviewed the EagleTree data yet. The flight log showed the R921 RX w/satellites performed in a stellar fashion.

Flaps worked great! Set per manual for mid & full positions. I thought I would need to determine a flap to elevator mix and / or use flight modes in the JR. Ended up no elevator correction at all required to land her nicely! Servo slowing on the flaps looks sweet as well.


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Old 02-16-2010, 03:18 AM   #15
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Default Weight vs Watts

Does anyone have the actual ready to fly weight for the electric build?

I've calculated at 7 lbs with a Pwr 46 and 4 cells to be 86.9 watts per lb and with 5 cells to be 108.6 watts per lb at the motors continuous 40a. This makes me think a Pwr 60 with 6 cells maybe a good performance option. Adding another 8oz for motor and battery would provide 121.6 watts per pound at 40a.

My guess is the pwr 46 with 5 cells providing 108.6 watts per pound @ 40amps and 149.3 watts per pound @ the motors 15sec max burst of 55a would do great.

4 Cells on the other hand seems under powered @ 86.9w/40a and 119.4w/55a.

Any thoughts?

Thanks
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Old 02-16-2010, 03:40 AM   #16
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I will have to get the AUW and EagleTree data later this week when I take it out again. It's @ a friends house @ the moment. I may try a 5s lipo. I do like the way it flies currently.

When I build the De Night Special 50 I will go with a Power 60 on 6s.

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Old 04-01-2010, 06:15 PM   #17
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I have just tested a power system on 5S 3700mah and Torque Revolution 540kv. ESC Jeti Opto 77A
APC 14X7 1000w 55A
Xoar 14X7 900w 45A, but here I have much more torque. I have no equipment to measure that, but I feel it holding the plane - > Paradox
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Old 02-01-2011, 04:20 PM   #18
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Hi there, nice builds guys!!

Based on the good reviews, scale looks, and excellent quality from Hangar 9, I also got this plane, I have about 15 flights up on it.
my setup is as follows: Eflite 46, 85amp esc 6S 3300 mah 35C
13x6 apc-e
She was cutting out (over volt limit?) on 60amp esc around mid throttle, but no problems now, loads and loads of power, but only 6 mins of 50% throttle.

About to get the H9 Denight racer, going to use same batteries, but 100amp esc ( just lying idle, wont hurt ) and either an eflite 60 or 90, going to start with the 90 and a 16x8 prop. Looking for blistering speed from the denight, and scale like flying from the RV.

Ill post pics of the denight as she goes on a different thread, but it will be interesting to compare the power setups with same lipos. Im using http://www.ecalc.ch/ for guidance.

Any suggestions?

http://www.facebook.com/grahamdwyer


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Old 08-04-2013, 07:15 AM   #19
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I have this plane with the Power 52. Flies real nice.
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Old 03-04-2014, 10:22 PM   #20
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I have 2 RV8s! I had bought one locally that I found on RC Univ. My wife didnt know, she got me one online for Christams! With that being said, I am new to electrics.

I am considering on OS40, OS50, Rimfire55, Eflite52, or Eflite46. Maybe even an Eflite60. Looks like a little exrtra weight up front would be well spent on the motor weight.

Lastly, ESCs with BEC built in worry me. Maybe an OPTO ESC would be safer?

I have a just bought at Perry, a DX-9.

Any assistance appreciated!

Cesar

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Old 03-04-2014, 10:37 PM   #21
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Originally Posted by skyboy50 View Post
I have 2 RV8s! I had bought one locally that I found on RC Univ. My wife didnt know, she got me one online for Christams! With that being said, I am new to electrics.

I am considering on OS40, OS50, Rimfire55, Eflite52, or Eflite46. Maybe even an Eflite60. Looks like a little exrtra weight up front would be well spent on the motor weight.

Lastly, ESCs with BEC built in worry me. Maybe an OPTO ESC would be safer?

I have a just bought at Perry, a DX-9.

Any assistance appreciated!

Cesar

Ah Ha
You came to the right place!

Here is a bit of reading information on this size model.
As for me, those $$$$ Hacker A50 series motors work well in models running about 7.5 to 8 pounds. Or, check out those Hyperion motors.

If you don't have the ESC yet, check out those Castle Creations Talon ESC's. I've got their 90 Amp unit. These ESC's use a switching type of Battery Elimination Circuit that will provide all the servo power you'll ever need.

Redwing MXSR Model
http://www.wattflyer.com/forums/showthread.php?t=72225

Thread on 70 size glow engine conversion to electric
http://www.wattflyer.com/forums/showthread.php?t=45222

Hacker 6S2P A123 powered Models
http://www.wattflyer.com/forums/showthread.php?t=44686

Hangar 9 Kantana Model
http://www.wattflyer.com/forums/showthread.php?t=68844

Hanger 9 Twist 40 Model
http://www.wattflyer.com/forums/showthread.php?t=70548

AEAJR's Site on Electric Power
http://www.wattflyer.com/forums/showthread.php?t=18521

BEC Linear Current Rating
http://www.wattflyer.com/forums/showthread.php?t=63779

DennyV
Retired and the days are just too short, busier than ever!
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Old 03-04-2014, 11:32 PM   #22
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Denny,

Thanks for the great info!

I see your retired. I retired from FAA on January 3rd. I havent flown in 15 years as my work had me traveling a lot and also I live 1 hr from my work, so I wouldnt get home till late. Im trying to adjust to retirement. I have continued to buy stuff over the years, so I have a bunch of everything... this should ease my transition!

The RV8s will be down the road a bit, I will start with a Goldberg Protoge ARF followed by a BigStik 60 from GP. I do belong to a club here, so Im not going it alone. I also have a good friend (Joe) about an hour away that is big into electrics, so I will be seeking his advice also. Just as a point of interest... Me and Joe used to fly RC in Puerto Rico in the late 60's! Just ran into each other at SEFF about 3 years ago. Now we go to Perry, SEFF and Joe Nall together every year!

Again, thanks!

Cesar

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