Alex7403

Its sitting without wing supports just on the big LE TE gauge on rib 11, no biggie just gonna be big fiberglass on top.

eaglelope

I have a CG Chippy too and love it. I use a Magnum 91 RFS which is a bit more affordable than the OS.

I also mounted aileron servos in the wings instead of using the bellcranks. I put hardwood rails across the rib bay where the cranks would have been and just mounted the servos inverted (as opposed to sideways with a hatch).

Beefing up the LG isn't a bad idea but the only issue I've had in 2 years was due to me flaring too high.

Have fun with the build!

Alex7403

For the servos you just glued rails to the ribs so the servos just sitting out or on their side?

This wing is built differently than two wing halves, just glued the wing braces its matching at the spar and at the LE, the sheeting will be matched with pressure.

eaglelope

Yes, I set the servos up so they are sitting out (inverted) not on their sides. As I recall, I put doublers on the ribs too to hold the rails.

I thought about mounting the servos on their sides for a cleaner install but decided against messing with plates/hatches. Around the same time I put together a Great Planes Shoestring ARF (the now discontinued .60 size) for my son and it had exposed servos in the wings. I realized they didn't look bad when the plane was flying and it was a bit simpler.

I think I had a similar mismatch on my wing too. I lined up the spars, the LE and the bottom sheeting as best as I could. I built mine with flaps and had to cut a hole in the top sheeting for a servo anyway so alignment wasn't critical there.

Here are some lousy pics (kinda late here so I didn't pull the plane down to get a better shot). I'm glad to provide more pics if you like tomorrow.

Alex7403

Thanks I'm thinking if to do the servo mounted on the side or like you did - I see the benefit of this.
dont bother with pics not on this thing - will need that later on complicated stuff.
It looks like I'll do flaps with one servo from the top and fiberglass with 5" tape.

Alex

Alex7403

This way of building a wing is strange and uncomfortable from now on only two wing halves, still joining the wing.

dragonov3

My Feedback: (3)

I was just going through some of my old pictures and found some pictures of the one I built. So I went to Walmart and had them scanned and put on cd. Only cost 3.50 to put as many pictures on the CD as it can hold. Here are a few pictures of the one I built, as well as some pictures of the plane I modeled it from. The real plane is Leo Loudenslager's. Keep up the good work on your chippy, I will start the build of two of them on Sunday. Both will have the same color scheme as my old one.
Dan

Jeff Spicoli

That is a beautiful plane.

Alex7403

Thanks Dan, its a beautiful chippy you built I understand why you want to build another one of the same covering scheme.
I'm still figuring out how to mount the servos inside the wing - servo per aileron.
I'll be glad to read building suggestions if you have.
Thanks
Alex

dragonov3

My Feedback: (3)

I believe I'm going to do the wing servos the same way I did it for my Midget mustang. Here are a few pictures. It is an easy way to do it, just make sure you can get your servo wires to the receiver.

MinnFlyer

My Feedback: (4)

Piece o' Cake

Cut a 1/8" ply platform to fit between two ribs with a cutout for a servo

Glue it between two ribs (With some tri stock underneath) in such a position that the servo will protrude through the top (have the servo temporarily mounted for this)

Remove the servo and sheet the area between the two ribs and cut out a hole for the servo and mount it.

gmohr

I didn't know Leo ever flew a Chipmunk! Very cool.

dragonov3

My Feedback: (3)

Weird, I googled this plane and I can find no history of it. I took the picture at the redding CA airshow around 1988-89. I am sure Leo was flying this plane.
I went to wikipedia and it makes no mention of him having a chipmunk. Makes me wonder if my memory is failing. If anyone has any further history about plane that would be neat to know. I spent about 2 hours researching this and can find zilch about it, not even another photo.

Alex7403

maybe the spelling is incorrect try also youtube, wikipedia is not that reliable source of information.

Thanks for the suggestions for the aileron servos guys, it got me back to the build.

vpresley

My Feedback: (162)

Dan


Leo was there at Redding, but I dont think the Chipmunk was his plane. I think it was someone elses plane. If my memory serves. But I am old and my memory is subject question ! LOL

Alex7403

it looks like the wing has too much dihedral but its what the instructions call and the wing joint dictates.
Sheeting the wing center, I put the servo extensions instead of the bellcrank rods, I'm planning to use a central servo for flaps and to pull the Y harnes from that opening.

planebuilder66

My Feedback: (8)

That's not too much dihedral, I was shocked to see how much my P-47 had when I built it in the igs, it still looks weird to me, but it flies fine, even my GP extra has dihedral built into it. Nothing to worry about, they still fly fine, alerion differential is always going to be needed if you need axial rolls on a low or high wing plane.

Alex7403

My only fear with that setup is that the rib with the hole will not hold because this whole sevo is mounted to the ribs.
Did the aileron servo mounts today, I had some old servo mounts from 4*60 so I cut them to fit the smaller ribs of the chipmunk.
I didnt do the servo mounted out because the wing is thin and it would be sticking out any other way so they had to lie.
I want to do also cap strips from the side to have something to stick covering to, I'll glue a piece of balsa on the side of the ribs and sand it to fit with masking tape for protection.

MinnFlyer

My Feedback: (4)

You can kill two birds with one stone - or more accurately, solve both problems with one fix...

Glue a 1/4 x 1/4 stick to the sides of both ribs (The sides opposite the servo) and sand them flush with the hatch. This will strengthen the rib with the hole and provide a place to stick the covering

Alex7403

So I'm doing the flaps torque rods and there is a distance difference between the rods when flaps down and up, in other words a simple rigid Y rod from the servo will not work.
the last two pictures is the aileron servo cap strips but the main issue is the flap rods.

MinnFlyer

My Feedback: (4)

A "Y" rod WILL work. Just leave the "legs" long enough to flex a little to make up for that inconsistancy.

Or, you can do it like this. Note the "V" shape in the joiner wire. That allows for movement between the torque rods

ArcticCatRider

My Feedback: (6)

I don't know if Leo Loudenslager ever flew a Chipmunk...but I do know he was famous for the Laser 200. Specifically the Bud Light Laser.

Alex7403

I'm back into building, got enough of looking at other builds.
the wing need some minor cutouts and I'm working on the fuselage doing the fire wall and fiberglassing the back to the fuse sides.
also got a fiberglassed cowl, tower 75 motor and a pitts muffler for it, do I need a gasket between the muffler and the engine?

dragonov3

My Feedback: (3)

alex4075 Very nice build. I have also started building a chippy for my friend. Wing is almost done and tail feathers are framed up.
I am using fiber glass cowl, wheel pants, and OS .61FX. I also am using robart hinge points on all surfaces. I am making balsa wingtips because the kit my friend got off of e-bay were missing. I like the way you did your servos and will do them the same way. The tower .75 you are using is plenty of power and you will love it. As far as using a gasket between muffler and engine, I have always done so. It keeps the muffler and engine from rubbing together causing black sludge from being formed causing a mess.

Mako17

Just use a thin bead of hi-temp silicone