1949 Lawrence Institute of Technology G-1

The canopy silver dope and wheel black dope painted in place. I took some pics outside so you can see how bright white it really is. This would make a pretty neat RC model.





Good night!

Seen this over on RCG but thread was closed . Very nicely done model of a very seldom modeled plane . I would think that the elevator might be a tad sensitive with the prop turning . Can't wait for a flight report . https://2img.net/u/3015/29/34/60/smiles/3873778864.gif

                                                 Mike1484

Mike1484, yes I put it on RCG after posting here first. I wanted to give this website a little plug! I posted a few pics there and it got absolutely no comments whatsoever. However... I saved a very nice little tidbit just for the folks here! The G-1 is now flyable. I made the lead outs, push rod and elevator horn. I may put some more details on it. It weighs 162 grams. The last thing (the tidbit for Cox Forum Members' eyes only) I had to do was remove a nylon hinge pin and substitute a new hinge pin that also functions as the elevator horn.









Ready for test flights! Now I gotta find a way to get the flight video done.

Wow! She sure does look super! Thanks for the tip on the hinge/elevator. That looks like something I'd like to try.

Thanks, Marleysky!

Marleysky wrote:Wow! She sure does look super!  Thanks for the tip on the hinge/elevator. That looks like something I'd like to try.  

Exactly what I think !

Thank you very much,

Wow, That looks really good, Nice paint job

Merci beaucoup, navion34! Thanks much! I really enjoy the Paris Roubaix, Tour de France and bicycle racing in general. Jalabert was my favorite!
Thanks, akjgardner! I appreciate it very much!!!

NICE !! have you done the hinges like that before and test flown them ? I was wondering if you would get flex or flutter from that piece of wire .i do like the way it's hidden getback

I've seen this application before. I have to agree with Eric on this one that your going to experience a lot of flex on that wire. It's just not heavy enough under a load without twisting. The end result is controls that mush out. If you stiffen the vertical portion with another piece of wire soldered to it and epoxy into the elevator, it will prevent that . It certainly is a good looking plane.

Ken Cook, yeah... it's a little 'flexy' but I'm not a good enough CL pilot to know the difference. I just like to go around in circles! If it does weird flying stuff then I'll brace it as you suggest. Thanks for the info!

Very nice looking scale model! An alternate method to stiffen the elev. horn would be to cut a triangular gusset from thin (.8mm) balsa. CA-tack it to the elevator just behind the wire and wrap a tab of paper around the wire for securing to the gusset. The CA-soaked paper and balsa should create a strong assembly.

A little reinforcement now can save you a lot of grief later take that from someone that know I had a flex problem a few year ago that leant me something      If it were me at least add some support to that one wire and a guide(flex) support if you don't have one     getback O hey that's a nice looking example !!!

Roddie and getback, thanks for the tips. Too bad about the breakage, too! I secured the hinges with epoxy so I think I'll pull them with aid of heat. Then I can make another horn similar to what is presently there but with an addition. Where the wire was wrapped around the push rod it will get an extension that can be let into the elevator to form a triangle gusset. Think that'll work?

ARUP wrote:Roddie and getback, thanks for the tips. Too bad about the breakage, too! I secured the hinges with epoxy so I think I'll pull them with aid of heat. Then I can make another horn similar to what is presently there but with an addition. Where the wire was wrapped around the push rod it will get an extension that can be let into the elevator to form a triangle gusset. Think that'll work?

I would think that would work well.. but do you have enough elevator-wood rearward for that extension-leg to attach to?



It's hard to tell from this pic.. but the elevator's clearance-angle cut-in for rudder-offset doesn't leave much distance for an anchor-point.. if you're going with a "wire-only" extension. It would have to be a linear "straight-shot" with the pushrod.. so as not to flex sideways. Conversely.. the smaller the extension-leg's angle, the more susceptible it will be to linear-flex. You're probably trying to achieve a low-drag/streamlined link.. and it definitely would be.. but the closer you can make the angle to an equilateral-triangle, the stronger it will be. It's a challenge.. with the horn so close to the edge of the elevator. I really like the concept though.. and having the pushrod close to the tail-boom allows for the brace that Eric mentioned too. There's a few ways you could do that.. a tiny safety pin with the clasp nipped off, creates two "legs" that can be glued to or into the boom. An "eye-pin" is another option, having a single-leg. Either would not have a significant effect on drag.

The "eye-pin"..



I used these little safety pins as lead-out guides.. but you can see how they'd work for a pushrod.

According to my calculations using angular acceleration a=(v x v)/r and Young's Modulus of Elasticity coupled with the flat plate air load forces (elevator), the centripetal accelerating forces on the pushrod causing it to bow thus shorten actually helps with regards to the deformation of the wire horn. The two forces will create a net effect of perfect harmony with regards to control input. As the horn deforms it will reach the limit of its elasticity but the shortening of the push rod by the bowing action of tangential acceleration compensates giving the elevator the input as needed in the first place. Isn't that sweet? Now... without the B.S. In other words if this junk don't fly right then I'm gonna add that horn brace! If it still don't fly right then I'll add that boom eyelet!

now that was a little much BS , Would you please take us a video I wish U luck with it I like the idea ! getback

ARUP wrote:According to my calculations using angular acceleration a=(v x v)/r and Young's Modulus of Elasticity coupled with the flat plate air load forces (elevator), the centripetal accelerating forces on the pushrod causing it to bow thus shorten actually helps with regards to the deformation of the wire horn. The two forces will create a net effect of perfect harmony with regards to control input. As the horn deforms it will reach the limit of its elasticity but the shortening of the push rod by the bowing action of tangential acceleration compensates giving the elevator the input as needed in the first place:new year:

You seriously need to get together with Ian.  He would definitely understand what you just said.

Hi ARUP, your plane is very nice, out of the ordinary and you've proven that white can be colourful!! A little late maybe but here's a pic of the elevator horn of my V1. It's made from a paperclip and epoxied into the wood.



Lieven

That's pretty darn cool Lieven , I don't remember seeing that or maybe you didn't show it off I still like making mine out of ply. sometimes just seems to blend in better . Is there much play in it were the wire goes through and what did you use for the wire end ? Eric

Eric, the paperclip wire was wound around the music wire I used for the linkage. It's got just enough play for free movement. The linkage only has a 90° bend and I stuck a piece of electric cable plastic outer insulation on the end.

Lieven

The paperclip idea is a good one and it goes well with my frugal mentality. I'm waiting for a response from Aviojet at Stunthangar forum for tiny graphics. I would like to get them in place and clear coated before flying.

That elevator is so large that for speed flying it should only move a fraction anyway. A wooden triangle on the elevator should be fine. Does that model have rudder offset? If so, I don't think it should. Tip weight is it's friend. I'd find a nice 2 bladed pusher that fits with as much pitch as you can find, 5x4 pusher or a 5x5 Kirn pusher cut down to whatever you need to fit it in there would be great. I think Bernie the Cox man made a run of those resin Kirn props...
Just my thoughts looking at it. Nice model, one of my weirdo Formula 1/Midget favorites. I like the pushers, the ACME Beatty pusher here and the Allenbaugh pusher.
Chris...