F-82 Twin Mustang
 

Here's a pic of my scratch-built F-82 Twin Mustang. It's powered by O.S. fs-30's and uses mechanical retracts. It has a fairly scale outline and has pretty high wing loadingand yetstillflys well with one engine out ( It happens every once and awhile and doesn't seem to matter which one) although I have no idea how it will fly with both engines out(I'm thinking "Brick"). This picture was take last year on vaction in Redding California at theRedding r/c flyers field.

RE: F-82 Twin Mustang
 

Great looking scratch built..!! I have a P-82 from Nitro Planes ARF in the box still, amongst my other 28 all NIB, don't know when I'll build it. I think it is a 70" WS, for two .40-.46 2s, or .52-.70 4s.

What are the dimensions of yours?

RE: F-82 Twin Mustang
 

Looks good,
But since were showing off here's mine from close to 20 years ago ;),,,
2 house of balsa kitbashed, OS 32 FSRs, RoamAir retracts,,, Warbird racing days, she was fast,, and also flew fine with one engine out, just shook around some

RE: F-82 Twin Mustang
 

Here's the dimensions for the f-82 : w.s.50" , fuse 34". I based my design around an old set of plansfor Ritch Uravitchs P-51-D "Reno Racer" which pre-dates and is a little different than his House of Balsa .20 size P-51D. I lengthnd the nose and tail of the Fuse. Added an 11" center wing section and shortend the outer wing panels. The vertical fin and rudder are based on an F-82E night fighter(Thus the Radome and all black paint scheme). I did use the H.O.B. .20 Mustang Canopies which you can order from them for a couple of bucks each.

RE: F-82 Twin Mustang
 

Propwasher,

I have the Nitroplanes F-82 and have flown it for 2 seasons. I used Thundertiger Pro .36's and Bisson mufflers and 10x6 props. Flies great. Repalced the retracts with Hobbicos. I wouldn't go bigger engines as the plane will be nose heavy and the plane does want to nose over!

Speed is a tad over 85 mph.

RE: F-82 Twin Mustang
 

I added an 11" center too, gave is a 54" span which under the rules was the minimum span, they changed the rules to 60" minimum for twins the next year, I guess I got to close to winning. Sure was fun to fly.

Mine had a Vortec Bomb drop system too, that was fun

p.s.
I like the scale details on yours, mine was sport scale at best I'm dreaming of a larger one but have too many logs on the fire already ;)

RE: F-82 Twin Mustang
 

My F-82 loves to nose over, and would be able to, except for the fact that the Radome won't let it. Sure has saved alot of props.

RE: F-82 Twin Mustang
 

here are pics of my TF F82 conversion

RE: F-82 Twin Mustang
 

Mine ate props too, good tip,, mine next one would be the Night Fighter for sure too,, grass runways and all ;)

RamBo, I thought that was up for sale?

RE: F-82 Twin Mustang
 

it was up for sale when in kit form.....only got some nibbles and a few inquiries. If the price is right, it could be up forsale again. 2xos90, robart air retracts and mechs on the tail wheels. Setup with flaps also and has all servoes installed

RE: F-82 Twin Mustang
 

That is a sweet machine...
Obviously a man with FANTASTIC taste in fine aircraft!
Regards,
Wally
(F82FAN)

RE: F-82 Twin Mustang
 

Multiengine guy, what color "Black" didi you use to finish the F82?

RE: F-82 Twin Mustang
 

My Squadron Mustang book say's they were painted gloss black, althought there's not one picture of a "shiney" F-82. I covered mine with Monocote flat black, which is more "matte" than "flat", so there is still some shine. I'm going to recoverit in fiberglass cloth soon and paint it.
Probably going be Matte or gloss black(With alot of weathering added).


Jon

RE: F-82 Twin Mustang
 

Nice planes guys.
I am currently building up my F82 from a Nitroplanes kit I bought a year or so ago. I am installing a couple of Saito FA-40 engines in it. The Saito 40 engine actually weighs a little less than what the TT Pro 36 engine weigh, about 22 grams. I think it is mostly the huge muffler they use on the TT 36. But the TT 36 is more powerful though. But I think the Saitos will sound better.

RE: F-82 Twin Mustang
 

Earlwb,
Saitos will sound way cooler!! here's my next F-82
a scratch built 85"w.s. job which will be powered by
Saito 1.00's. post some pics of your plane!

~Jon~

RE: F-82 Twin Mustang
 

Multi-engine-guy. Nice fabricating there in that F82. Isn't it fascinating as to how fast a twin engine plane can grow up to enormous sizes as the engines get larger. A 70 inch wingspan works well with 25 to 32 size 2 stroke engines. A 80 to 85 iunch span for 40 to 45 engines. A huge 95 to 100 inches wingspan for 60 engines. it gets scary going larger.

When I was putting the Nitroplanes F82 ARF kit together, I found one major flaw so far. They want you to use 1/4 inch by 3/8 inch balsa blocks for the aileron servo mounts and the flap servo on the mounting plates. Not really any surface area for the glue to hold and really, even with super glue, the screw holes are not going to hold up for every long. So I was slowed down by needing to make some plywood servo blocks instead. I glue some 1/8 inch pieces together and drill those for the servos and then use some 5 minute epoxy to glue them to the servo plates in the wings. But anyway, soft balsa wood for servo mounts. I just do not see that as being viable.

The next odd thing was they included huge round and long 12 ounce fuel tanks with the kit. Man no wonder people were having trouble at takeoffs, as they had 24 ounces of fuel load up front in the long nose of the two Mustang fuselages. That makes it really nose heavy. Now if you used 45 or 50 size 2 stroke engines I could see using 12 ounce fuel tank. Buit the plane would be really too nose heavy with those engines anyway. I wanted to use 6 ounce tanks, but the LHS didn't have any, so I wound up with 8 ounce fuel tanks, But I think 6 ounce fuel tanks would be better, it isn't like four stroke engines can consume fuel at a fast rate like 32 to 36 size two stroke glow engines can.

The next gotcha, a minor one, is to use the retracts, you need to notch the one plywood reinforced rib to clear the retract pushrod arm. Otherwise it won't clear. The retracts that came with my kit don't seem too bad, they are working. So I'll give them a try and see what happens. But I have been drawn towards the nifty electric retracts lately. But we'll see.

The wing is pretty impressive as it is a little over 70 inches of wingspan after you glue it together, The wing sections went together with no hassles. I used 30 minute epoxy to glue in the plywood doublers and wing panels. I also added some extra string from the aileron mount points and taped them in place to make it easier to thread the servo wires through the wing, A 24 inch extension works about right to get the right aileron wires over to the left fuselage, where I'll place the receiver and battery pack. You could also reverse it and put the receiver and battery pack in the right side fuselage too. I have thought about doing that myself. I can see where the plane might want to roll naturally to the left anyway from the torque reaction from the props. So that might be worth some thought.

Unless you are doing a lot of mixing with a computer radio, I see where I need three Y-connectors for the two aileron servos, the two rudder servos and the two throttle servos, I like to use a 6 inch to 12 inch long extension in the receiver to allow for easier plugging in the servos to the receiver.

I'll get some pics of my progress soon.

anyway I took a pic of one of the servo trays after I made some better servo mounts for them. I took some 1/8 inch plywood and glued it together to make a more thick piece and then sawed them to length. I then drilled and screwed the servos into these stronger and longer blocks and glued that down onto the plywood trays.
The pic shows the 1/4 inch balsa blocks they wanted me to use instead. i just do not see how balsa would be safe to use for servo mounts
http://i248.photobucket.com/albums/g..._ServoTray.jpg

RE: F-82 Twin Mustang
 

earlwb,
Thanks for the compliment on the fabrication on the 85"ws F-82.
I wish I could take the credit for it, but I can't, as I didn't build it.
This model was given to me as is, back in june '09 by Sam Wright(The
"voice of TopGun") and the Scale Sqaudron of Southern California.

I was flying my little F-82 at a Scale Sqaudron fun-fly, Larry Wolf of
Jet Hanger Hobbies was my spotter and while I'm flying ,he mentions
that knows someone who wants to get rid of a .60 size scratch-built
F-82. When I ask him how much , he tells me, He doesn't want any
money for it. I'm lucky I didn't crash right then, all I could think about
was a big F-82 flying around, not my puny little 50" ws scratch-built
job. What a difference 35" of wingspan makes!

I told sam and the guys at the Scale Squadron that I would finish it
as the "Betty Jo" in honor of their friend Col. Robert Thacker, who still
holds the world record for speed/distance in a prop plane(Honolulu
to New York in under 15 hours).

I'll probably start a new thread for this plane once I get the project
going.

~Jon~

RE: F-82 Twin Mustang
 

I'd rather be lucky than good anyday ;)

RE: F-82 Twin Mustang
 

Make that Scale SqUAdron. My spellin' stanks. It was late.

~Jon~

RE: F-82 Twin Mustang
 

MultiEngineGuy,  Congratulations on scoring your big F82 there. Nice.

RE: F-82 Twin Mustang
 

Some pics from when i was putting my F82 together. One caveat is to carefully check the servos and the pushods out as the pics in the instructions have you putting the rudder servos on the wrong pushrod tube. so think about it before you go installing the servos, pushods, control arms and linkage.

I was too windy this weekend, so i didn't get a chance to take it out to the flying field and take pictures of it all put together and ready to go.

http://i248.photobucket.com/albums/g...82_fuse_04.jpg

To install the blind nuts on the inside, I use a small flashlight and a magnetic pickup tool to hold the blind nuts for me from the inside.
http://i248.photobucket.com/albums/g...ickup_tool.jpg

I can then get the motor mount screws started on the blind nuts and I can reach in with my finger to help hold the nuts so I can seat them with the screws.
http://i248.photobucket.com/albums/g...ool_in_use.jpg

Retracts installed and working
http://i248.photobucket.com/albums/g...install_06.jpg

http://i248.photobucket.com/albums/g...install_04.jpg


http://i248.photobucket.com/albums/g...install_03.jpg

http://i248.photobucket.com/albums/g...install_01.jpg

I later replaced the hex head screws with set screws to lower the profile a little more. But I wound up with a bulge over the top of the wing where the retract servo is located. I tried several different retract servos and they all stuck up too high.
http://i248.photobucket.com/albums/g...install_02.jpg



http://i248.photobucket.com/albums/g...cockpit_02.jpg

http://i248.photobucket.com/albums/g...cockpit_01.jpg

http://i248.photobucket.com/albums/g...82_fuse_01.jpg

RE: F-82 Twin Mustang
 

Oh yeah, here is a couple of video clips showing me testing out the retracts to ensure they are working OK.
[youtube]http://www.youtube.com/watch?v=hr0QtTKdKSs[/youtube]


[youtube]http://www.youtube.com/watch?v=gtwJQhC5o0I[/youtube]

RE: F-82 Twin Mustang
 

Put Z bends on the retract pushrods at the retract servo and it will be much cleaner...

RE: F-82 Twin Mustang
 

Yeah I thought about the Z-bends too. But the servo arm sticks up a bit too high still. So I would still have a bulge there, albeit a smaller one. So I opted for a larger bulge and used the EZ Connects with metal snap rings. I just replace the hex head screws with internal set screws and it isn't too bad then.

RE: F-82 Twin Mustang
 

How about laying the servo on it's side then?