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-   -   $100 Twin Build Contest XF5U (http://www.Wattflyer.com/forums/showthread.php?t=73638)

xmech2k 04-26-2014 09:50 AM

$100 Twin Build Contest XF5U
 
Well, I said I'd start my thread when the foam arrives, so here it is. I'm building it from Andy Reynolds plans from the AMA Park Pilot magazine. Flat foam, twin Suppo 2208-14 1450kva motors swinging counter-rotating GWS 7x3.5.3 props, 20 amp ESC's, 3S 2200 battery. The plans don't include them, but I may add working rudders and a tail wheel.

http://www.laesieworks.com/ifo/lib/d.../XF5U-1-02.jpghttp://static.rcgroups.net/forums/at...g?d=1351560712

Hope to get started soon. Been busier than a one-armed paper hanger this week, and this weekend is kinda booked, too.

solentlife 04-26-2014 11:13 AM

I'm really starting to consider that my choice of Tu144 may not be weird or interesting enough !!

This is some machine ....

Nigel

Wrongway-Feldman 04-26-2014 01:38 PM

Subscribed!

xmech2k 04-26-2014 05:53 PM

Quote:

Originally Posted by solentlife (Post 946564)
I'm really starting to consider that my choice of Tu144 may not be weird or interesting enough !!

This is some machine ....

Nigel

Are you kidding?! Through my many excessive hours of Internet browsing, I've never seen an rc Tu-144. Granted, it's similar to the Concorde, but I think it would be fantastic! Actually, I'd love to one day build your same Concorde and Tu-144. Definitely some bucket-list planes! So is the XF5U. That's why I'm pushing myself to enter this contest.

solentlife 04-26-2014 06:05 PM

Quote:

Originally Posted by xmech2k (Post 946582)
Are you kidding?! Through my many excessive hours of Internet browsing, I've never seen an rc Tu-144. Granted, it's similar to the Concorde, but I think it would be fantastic! Actually, I'd love to one day build your same Concorde and Tu-144. Definitely some bucket-list planes! So is the XF5U. That's why I'm pushing myself to enter this contest.

Gee .. tks ...

But the Concorde is actually easy .. DEG and I ironed out the difficulties to create a model that is really a flat square job with a flat plate wing.
All the CoG work is now sorted .. so it's a BnP job now ! Build n' Play !

It's why I like the Scratch section .. so many models shown .. read the text .. get the data so it flies.

Trouble is most time - for some reason I keep NOT building what people post .. so I end up in the R&D stage of a model ...

Silly me !

Nigel

DEG 04-27-2014 12:34 AM

Quote:

Originally Posted by solentlife (Post 946564)
I'm really starting to consider that my choice of Tu144 may not be weird or interesting enough !!

This is some machine ....

Nigel


Ahhhhhhhhh Nigel,

The Tu144 will be most interesting and a great follow up to your Concorde.

Now as for the plane I have on my drawing board now, it really isn't weird, just plain vanilla twin sea-plane, but it's been very interesting to me as I worked through all the problems as much as I could in the drawing. I selected this one when the talk was about having a build that could fly off water and land....now, the take-off requirement got dropped but I'll build it anyway but probably not for the contest.

Good luck on the XF5U Xman...I'm sure you'll have fun with it....

CHELLIE 04-27-2014 03:22 AM

Quote:

Originally Posted by xmech2k (Post 946561)
Well, I said I'd start my thread when the foam arrives, so here it is. I'm building it from Andy Reynolds plans from the AMA Park Pilot magazine. Flat foam, twin Suppo 2208-14 1450kva motors swinging counter-rotating GWS 7x3.5.3 props, 20 amp ESC's, 3S 2200 battery. The plans don't include them, but I may add working rudders and a tail wheel.

http://www.laesieworks.com/ifo/lib/d.../XF5U-1-02.jpghttp://static.rcgroups.net/forums/at...g?d=1351560712

Hope to get started soon. Been busier than a one-armed paper hanger this week, and this weekend is kinda booked, too.

That will be a neet build :ws: here is some information on how to add differential trust for steering if your interested, Take care, Chellie

http:/www.speedwing.net/minitwin_250_assembly_instructions.pdf

xmech2k 04-27-2014 04:41 AM

Thanks, Chellie. Yes, I'm considering diff thrust also. Actually, that's more definite than rudders. I'd like both to have more stuff to play with and see what she can do! Thanks for the article, too. But I'm afraid it kind of leaves me more confused. It can't be too hard. I printed the appropriate page from there anyway. Maybe it'll sink in later!

CHELLIE 04-27-2014 07:46 AM

Quote:

Originally Posted by xmech2k (Post 946618)
Thanks, Chellie. Yes, I'm considering diff thrust also. Actually, that's more definite than rudders. I'd like both to have more stuff to play with and see what she can do! Thanks for the article, too. But I'm afraid it kind of leaves me more confused. It can't be too hard. I printed the appropriate page from there anyway. Maybe it'll sink in later!

to keep it simple, you can use a simple v tail mixer with the ESCs, and you dont need to use the computer mixing on your transmitter, I like KISS :Q :D :ws:

thepiper92 04-27-2014 08:37 AM

Make sure it's like how the real thing was, and needs a wrecking ball to destroy it.

solentlife 04-27-2014 08:49 AM

Quote:

Originally Posted by CHELLIE (Post 946632)
to keep it simple, you can use a simple v tail mixer with the ESCs, and you dont need to use the computer mixing on your transmitter, I like KISS :Q :D :ws:

mmmm why didn't I think of that !!

I knew there must be a use for those gizmo's ...

Nigel

BroncoSquid 04-29-2014 01:29 AM

Quote:

Originally Posted by CHELLIE (Post 946632)
to keep it simple, you can use a simple v tail mixer with the ESCs, and you dont need to use the computer mixing on your transmitter, I like KISS :Q :D :ws:

One does not Pre-order a second generation DX-18 and then NOT use the computer mixing.:rolleyes:

xmech2k 04-29-2014 02:42 AM

Lol! How true! And I think it should be possible with the DX8 as well.

xmech2k 04-29-2014 10:24 PM

1 Attachment(s)
Well, printed the plans, taped together, got my scissors and exacto knife and voila! I have a paper airplane! :D

Attachment 175515

fhhuber 04-29-2014 10:27 PM

Differential thrust is very easy to do with any computer radio. The computer radios were developed partly to eliminate the need for the little mixing devices or mechanical mixing.

CHELLIE 04-30-2014 03:10 AM

Diff Thrust with a V Tail Mixer
 
1 Attachment(s)
hope this helps :ws:

http://www.Wattflyer.com/forums/atta...6&d=1398820212

gramps2361 04-30-2014 03:32 AM

Friend of mine cuts the mini twin gremlin with differential thrust programed into the rudder. What a spin this has I have seen him do this in person really fun to watch when he does it. Here is a link to the video he made.

YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


http://youtu.be/n4QXOPRaY9s

xmech2k 05-21-2014 06:52 AM

:red: I just got around to seeing your video, gramps. Pretty cool! Yeah, I definitely want to find out what unique things this plane will do. I have a PZ micro Stryker that'll do that trick, but it's a single pusher and does it power off, so it isn't as impressive without the motor sound.

In other news, I finally got all the foam cut out! And I'll bet everyone thought only fhhuber was making progress with his Batplane! Though I can see that someone with the experience, supplies, and place for building should knock a plane like this out in a couple of days.

Next stop, LHS for the balsa, carbon rods, etc.

fhhuber 05-21-2014 08:11 AM

Note a problem with the little mixer between the RX and ESCs.

You may not be able to get a low enough throttle with throttle 0 and rudder centered...

You can fix that in a computer radio's EPA/ATV and mix % functions.

xmech2k 05-21-2014 04:52 PM

Quote:

Originally Posted by fhhuber (Post 948793)
Note a problem with the little mixer between the RX and ESCs.

You may not be able to get a low enough throttle with throttle 0 and rudder centered...

You can fix that in a computer radio's EPA/ATV and mix % functions.

Have no fear, I now have the ultimate power in the universe, a Dx18g2! (Angels sing! ) now I just have to figure out how to program a desirable throttle mix. I found a guys youtube video and website that showed a good way on the DX8, just have to translate if into Dx18g2 language.

First I have to get the plane built!

fhhuber 05-21-2014 05:54 PM

For the DX-18... plug the second throttle into any AUX. In the channel assign set that AUX to follow throttle and disable the slider/switch that is assigned to it by default. Then program 2 Pmixes, Rudder to normal throttle channel and rudder to the AUX at +/- 50% and put it on a switch. (in case you want to turn it off in flight) You'll find that the mixes work pretty well at that point.

Fine tune the percentages from there to suit your plane.

Exact mix plan I a using on a Dynam DC-3 for differential thrust when taxiing. It allows me to pivot around one main wheel.
I have good throttle control through the full range with the mix on and can fly that way but throttle for yaw in flight on my model isn't a good plan. Thrust lines are wrong for it to be helpful. (I tried to do the 540 pinwheel at top of stall turn and it wouldn't even do a normal stall turn with differential thrust active)

gramps2361 05-22-2014 01:23 AM

Quote:

Originally Posted by xmech2k (Post 948791)
:red: I just got around to seeing your video, gramps. Pretty cool! Yeah, I definitely want to find out what unique things this plane will do. I have a PZ micro Stryker that'll do that trick, but it's a single pusher and does it power off, so it isn't as impressive without the motor sound.

In other news, I finally got all the foam cut out! And I'll bet everyone thought only fhhuber was making progress with his Batplane! Though I can see that someone with the experience, supplies, and place for building should knock a plane like this out in a couple of days.

Next stop, LHS for the balsa, carbon rods, etc.

Glad you liked it sounds and looks even better in person. Be following along on your build I do like the unusual planes.

xmech2k 06-23-2014 08:46 AM

1 Attachment(s)
Well, a month later and I've been busy with the glue.

Attachment 176211

Slowly but surely... I've learned to use a new x-acto blade when cutting foam, and to not forget to put wax paper under my work when glueing. You can see I cut out the rudders, and I'll be fabricating some interesting pushrods and thingies to use one servo for the rudders and tail wheel steering.

pval3 06-23-2014 08:14 PM

entries
 
hey all
just bookmarked the thread
only three entries?
Phil

xmech2k 06-23-2014 08:34 PM

Well, I think there's Chellie's Cessna 337, Pmullen's P-61, FHuber's Batplane, Offtom's JU EF112, and my XF5U. That's five. Unfortunately, Wrongway-Feldman and Solentlife had to drop out.


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