P-39 2012 Fake Fest San Diego Build - Page 101 - RC Groups
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Jan 13, 2012, 09:43 PM
Jim in San Diego
Pismo's Avatar
Ok, I don't know what it is but this always bugs me:

Is there a proper length to use for the torque rods and tubes? I can see from the drawings that the cut in the aileron is 4" from the root and I can figure out the bends/lengths for the root but what about the outboard bend and tube? I think on my other planes I just made the bend where it looked good and made the tube long enough to just be able to hold the rod for the last 90* bend. If I go by the dwg, 1" - 1.5" looks about right.

Once again I'm over thinking this because I don't want twisty or fluttering ailerons and don't know if this has much effect on those things. I figure while I'm learning I might as well ask. I'll go get a beer and if I don't see a reply by the time I return I'll bend it like before. Starting to see why I take so long to build a plane or two?
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Jan 13, 2012, 09:50 PM
Crikey never leave beer behind
steve wenban's Avatar
Jim ,
When I was suing torque rods they where always a 1/3 into the span of the surface . The only time I ever suffered flutter was with and aerobatic machine and I thought I'd discovered gold with using the plastic from an Ice cream tub as hinge material DOH!!!! damn thing flutterd in a dive and blew 1 aileron clean off ,was able to land it and relpace the hinges but the lesson was learn ,and I quote " ICE LIDS" good for mixing bondo on and not for hinges
Jan 13, 2012, 10:00 PM
It was just a flesh wound!
he4gott's Avatar
Quote:
Originally Posted by steve wenban
Something old something new pss fest I'm coming for you
It'll need some work the poor old girl but she's tuff
Yeah...and the plane could use some fixin' up too.

Dale
Jan 13, 2012, 10:23 PM
Jim in San Diego
Pismo's Avatar
Thanks Steve but I don't think that'll work for these ailerons. That would put me over 10" from from the root and over 6" from the break/cut. I think I would for sure be getting past the 4-40 torque rod's ability to hold the torque without twisting. One thing I know I don't like is spongy controls.

I'll use the TLAR method after eyeballing the drawings. It'll do
Jan 13, 2012, 10:27 PM
Crikey never leave beer behind
steve wenban's Avatar
Well then TLAR is the correct length ,its my well worn increment on the scale
Jan 14, 2012, 12:57 AM
Registered User
Anybody doing the Cobra II air racer by "Tex" Johnston?
Jan 14, 2012, 01:13 AM
Just Toss It !!!
MATIN's Avatar
Quote:
Originally Posted by Pismo
....... I'll go get a beer and if I don't see a reply by the time I return I'll bend it like before........
That sounds like a threat......Are you threatening us?.....Hmmmm?.....Would you punch yourself if we didn't tell you???

Matin
Jan 14, 2012, 01:15 AM
Just Toss It !!!
MATIN's Avatar
Quote:
Originally Posted by RAFster
Anybody doing the Cobra II air racer by "Tex" Johnston?
Yes I am!.....What is yours going to look like?

Matin
Jan 14, 2012, 01:47 AM
Crikey never leave beer behind
steve wenban's Avatar
Quote:
Originally Posted by MATIN
Yes I am!.....What is yours going to look like?

Matin
Like a Mustang is that wrong???
Jan 14, 2012, 01:50 AM
It was just a flesh wound!
he4gott's Avatar
Quote:
Originally Posted by MATIN
Yes I am!.....What is yours going to look like?

Matin
What?! Only one "Tex" Johnston allowed...?

Dale
wouldn't dream of doing a "Tex" Johnston....no red....no white....no zebra stripes...
Jan 14, 2012, 01:55 AM
Jim in San Diego
Pismo's Avatar
No threats from me Had my beer, bent some rods, and all is well. g'night.
Jan 14, 2012, 02:00 AM
Just Toss It !!!
MATIN's Avatar
Quote:
Originally Posted by he4gott
What?! Only one "Tex" Johnston allowed...?
Dale
Yes!.....and if you had read page 69 of the manual you would have known that......

Quote:
Originally Posted by he4gott
Dale
wouldn't dream of doing a "Tex" Johnston....no red....no white....no zebra stripes...
You could dress the pilot in some hot 70s outfit!... No?

Matin
Jan 14, 2012, 10:24 AM
Registered User
ISRDAN's Avatar
The 4-40 torque rod's are plenty strong. Flutter is most often caused by one of two things. louse ( sloppy linkage) or the distribution of weight in the aileron its self.
Jan 14, 2012, 12:27 PM
I want it to go fast...
c0dem0nkey's Avatar
Quote:
Originally Posted by RAFster
Anybody doing the Cobra II air racer by "Tex" Johnston?
I'll be going with yellow...but perhaps blue trim instead of black
Jan 14, 2012, 01:55 PM
Airplane Killer
SumthinsFishy's Avatar
Quote:
Originally Posted by RAFster
Anybody doing the Cobra II air racer by "Tex" Johnston?
I was originally planning to. But I think I'm going with a non-scale scheme instead.


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