Molded Supra pushrod exits

[old dodger]

Im getting ready to start put a Supra together from Kennedy Composits (the
molded veriety). As I understand it pushrods on the exterior is lighter way
to run them. Qestion is where do you exit the pod with the least amount
of impact on the structure strength of the pod?

Those of you that have done the external routes - do you have pictures of
the actual exit? Have any of you had cracks or fractures? Is the pod
strong enough it dont matter where?.

Chris.

[BrianSmith]

I have built assembled about 6 Avas. I have not done a Supra "yet" :D.. But I think the Supra will be the same.. JW was here and his are like my Avas.. You exit the rear of the pod right above the boom/pod joint so that the control rods lay right on top of the boom.. They come out of the pod about 1/2 inch apart. You have to ream it out on an angle to get them to lay flat on the boom without binding.. I mix epoxy with cotton flox to fill the voids when I'm done.. If you grip your model back there to launch, put a little filler along the control rod sheath/housings for support.. Sorry, I have no camera for pics.. I hope that is helpful.. I'll be watching for more folks to chime in.. Brian

PS..OH yes.. I have dorked/slammed my Avas into the landing circle many times in my childish quest for landing points and have never had any crack or failures...


Im getting ready to start put a Supra together from Kennedy Composits (the
molded veriety). As I understand it pushrods on the exterior is lighter way
to run them. Qestion is where do you exit the pod with the least amount
of impact on the structure strength of the pod?

Those of you that have done the external routes - do you have pictures of
the actual exit? Have any of you had cracks or fractures? Is the pod
strong enough it dont matter where?.

Chris.

[Robglover]

PS..OH yes.. I have dorked/slammed my Avas into the landing circle many times in my childish quest for landing points and have never had any crack or failures...

Brian -
I wish you'd grow up. It would give the rest of us a chance every once in a while. ;)

[BrianSmith]

Yours innies or outies, Rob
Smashing my ships into the landing zone is needed to keep up with your scores..


Brian -
I wish you'd grow up. It would give the rest of us a chance every once in a while. ;)

[Robglover]

Mine are all innies Brian. I think it's easy to do and a cleaner install. I can show you how to do it next time you come down.
Rob

[BrianSmith]

I look forward to seeing you again and the CR set up.. Brian


Mine are all innies Brian. I think it's easy to do and a cleaner install. I can show you how to do it next time you come down.
Rob

[nuevo]

I don't know if the plane will be lighter with pushrods on the outside, but it will be easier to build. You can CA the tubes on the tailboom all the way back and guarantee no pushrod flex. Much more difficult to do that with pushrods internal to the tailboom.

Here's a few photos from the Ava thread (http://www.rcgroups.com/forums/showthread.php?t=173093) . Just make sure the pushrods have no bends in them. The slightest bend will cause binding. You can feel the binding with just the pushrods & tubes, before installing any linkages. Thus, you want the exit holes elongated with a file, just above the level of the tailboom exit.

http://static.rcgroups.com/forums/attachments/3/4/9/8/a310718-93-Ava%20pushrod%20exit.jpg

http://static.rcgroups.com/forums/attachments/3/5/6/0/7/a547828-73-100_1475.jpg

http://static.rcgroups.com/forums/attachments/1/5/6/6/8/a982489-31-exit.jpg

[dhauch]

hi,
give me a call if you like, and i will give you the exact measurments where to cut the slots.

dh
www.rc-builds.com

[dbarker]

hi,
give me a call if you like, and i will give you the exact measurments where to cut the slots.

dh
www.rc-builds.com

Dave, you've probably built more than I have. Which do you prefer (innies or outies) from a functional and weight stand put. I've build one of each and was going to do another innie, just from the cleanliness standput. I did not like the outie right where I was gripping the fuselage under the wing for launch.

don

[dhauch]

hi don,
i've built around 14 of these, and have gone both ways.

from a functional & weight stand point, i would go outies for sure.

i use black rubber CA on the pushrod were you would grab the plane and make nice fillets, it also really bonds the pushrod in this area so it doesn't ever break loose from handling it.

this db9 was pretty easy to fit in.

Barry said he's getting some new harnesses and connectors from Vladimere.

dh
www.rc-builds.com

[dbarker]

Dave

I like your DB9 in the pod.

don

[BrianSmith]

I'm paying Barry extra for factory wiring.. Have any idea what I'm getting? Brian Smith

hi don,
i've built around 14 of these, and have gone both ways.

from a functional & weight stand point, i would go outies for sure.

i use black rubber CA on the pushrod were you would grab the plane and make nice fillets, it also really bonds the pushrod in this area so it doesn't ever break loose from handling it.

this db9 was pretty easy to fit in.

Barry said he's getting some new harnesses and connectors from Vladimere.

dh
www.rc-builds.com

[old dodger]

Don,

The location of your pushrod exit is right where I was thinking. I guess
you havnt had problems? Ive got a Thermal Dancer with external push-
rods and dont realy mind them. They are glued down pretty good and
I use them to keep the fuse from rotateing when getting ready to
launch.

Thanks for the picture.

Chris

[davidleitch]

After a year of flying a 2.1 kg electric supra, and loving it, I was thinking of finishing the glider fuselage that came with the kit. So I cut some quite long slots at the back of the pod for the external rods but they still feel stiff to me. That is not straight enough.

So If I want to run them internally how I do I get them to adhere to the inside of the boom?

[bobby legue]

I dont have that plane but Ive had a lot of luck with cutting slightly oversized discs of foam and shoving them into the fuse with a length of dowell.

[Robglover]

So If I want to run them internally how I do I get them to adhere to the inside of the boom?

I use a couple small spots of expanding foam spaced at roughly even distances in the boom.

I get everything hooked up and glued in place at the aft end. I then put a couple small squirts of foam into the boom. You don't need to fill the boom up, but there is no major worry if you get a little bit too much in either. I add an extension tube to the foam can to enable it to reach into the boom far enough.

While the foam is still soft I route the forward end of the pushrods up through the pod in the correct places and let everything sit overnight while the foam sets up. (I had all of these runs made tested before opening up the foam) The rods will spring to their most comfortable spot and be as free as they can be.

If you are going to run your antenna wire down the inside of the boom you need to do it before squirting the foam in.

[dbarker]

After a year of flying a 2.1 kg electric supra, and loving it, I was thinking of finishing the glider fuselage that came with the kit. So I cut some quite long slots at the back of the pod for the external rods but they still feel stiff to me. That is not straight enough.

So If I want to run them internally how I do I get them to adhere to the inside of the boom?

David,

Temporarily replace the carbon rods in the teflon push rod tubes with equal diameter or slightly larger steel rods. Then use small magnets placed on the outside of the boom to hold the push rod and sleeve against the inside wall of the boom. It is very easy to position the push rods with the magnets. Then drip CA down the push rod sleeve inside the boom. Works like a charm and you still have an open tube for the antennae, not like the various foam plugs and expanding foam which require the antennae to be in place.

I tried the foam plugs once, but found it difficult to reposition the push rods once the plug twisted during insertion. With the magnets you can easily position the pushrods exactly where you want them before gluing.

Don