Assembly of Nexa P-47 (1500mm) Balsa Thunderbolt by Papa Boozer

[eric h]

Planning maiden flight .
30 mm full flap is recommended in build book. Agree?
Any recommendation for elevator mix?

[Thimble]

Loving mine!

[Robinson Parker]

I’ve had this plane for almost two years and still have not been able to fly it. I went out to the shop to try and toy with it again but I’m stuck. My elevator servo is having a really hard time applying any pressure to the control surface. I’ve tried adjusting the servo positions and even replaced the elevator servo. I can’t figure out why the elevator push rods are so difficult to move, even by hand they’re relatively sticky feeling. Where did I mess this up? Can anyone shine some light on my problems 😂

[marty 72]

Robinson,

Let's start with what servo do you have in there? Second, just sliding the control rod by hand, how sticky is sticky? You are going to have to guess a load, 1/8, 1/4, 1/2 pound? Is it dragging equally through the range or just in one spot.

If it's the control rod is really tight, it might need a bend in it. You are going to have to do some more experimentation to find a way to free up the control rod. But first, let's look at the servo, perhaps it's just not powerful enough.

[Robinson Parker]

Robinson,

Let's start with what servo do you have in there? Second, just sliding the control rod by hand, how sticky is sticky? You are going to have to guess a load, 1/8, 1/4, 1/2 pound? Is it dragging equally through the range or just in one spot.

If it's the control rod is really tight, it might need a bend in it. You are going to have to do some more experimentation to find a way to free up the control rod. But first, let's look at the servo, perhaps it's just not powerful enough.

Here is a quick video showing what’s happening. For some idiotic reason it was actually semi-working but still not up to my standard. The elevator is too important of a control surface for “good enough”! Ha.

[marty 72]

Ok, the servo is fine, I'm familiar with it, it should work fine.

Is this your first warbird? You don't need much elevator throw for warbirds. check your manual for throws, but I'm thinking +/- 12 millimeters and you are well beyond that.

You also may want to move your easy connect coupler for the elevator. That could cause binding, it appears to be hitting the sleeving in the video (but again, I don't think you need that much movement).

Before you drive yourself crazy, just move the elevator the required throws. Disconnect the servo arm from the two control arms and operate the elevator (each side alone) by hand and see if you have binding. If that's good, then connect the two rods together and see what happens, if that passed move on to the servo arm, ect. Go back to basics and systematically solve the problem. Check one thing at a time, verify it works and then move on to the next level of complexity.

Your elevator hinges could also reduce your throws, it may not be drag in the control arms/sleeves. Just another thing to check.


Just my thoughts.

[Robinson Parker]

SOS! This is the last thing I need to figure out before I go fly! 😪

[mgholl2000]

Do the retracts plug directly into the receiver through a y-harness, or is a separate controller required?

[Elbee]

mgholl2000 Welcome to Hobby Squawk. Glad to have you onboard. Best, LB

[Robinson Parker]

Landing gear?? The struts are so wobbly that I haven’t even gotten the chance to fly this bird yet. It can’t roll
on grass due to the fact the landing gear is essentially bowing out when the plane is sat on the ground. I really want to fly my P47 but I can’t get it going! Help please 😎

[Not-So-French-Toast]

Robinson Parker Hopefully you've gotten an answer by now, but in case not, a youtuber said they used the landing gear from the FMS 1500mm P-47 and the trunnion from the Flightline 1600mm Corsair. I've just ordered my P47, and I have ordered the FMS landing gear and will see what I think. I haven't done the Flightline trunnion yet, but if I feel I need to will order it later.

Have you figured out a solution though? If you have, I'd be curious to hear what you did to make it work

[Elbee]

Not-So-French-Toast

Welcome to Hobby Squawk, glad to have you onboard.

Thanks for your reply to an older post, good form.

I am looking forward to seeing your build of the Nexa P-47.

Keep us up to date on your progress, as is reasonable.

Best, LB

[Not-So-French-Toast]

Elbee Thanks, will do! I still have some parts to order over the next couple of months, so it'll definitely be a slower work in progress. Hopefully I'll have it ready to maiden by the end of the summer

[Elbee]

Carry on.

[Mike1960]

I just finished building the Nexa p47. Is the CG calculated at the wing root? The manual indicates 88 to 93 mm, but it does not specify whether this measurement is taken at the root. If anyone can provide some advice, it would be appreciated. Thanks

[Elbee]

Yes, from the Leading Edge at the wing root.
Use a straight edge at 90 degrees to the wing tip, mark that location at each wing tip, if you are balancing at the wing tips as your method to find CG.

[Mike1960]

Thanks Elbee