IMAC Terryscustom 35% MXS-ST Prototype

[Fibertech]

Terry..have you thought about G10 or Type 2 PVC or even Delrin for these parts to eliminated the side thrust vibration wear. I know this is your proto. Just asken.

 

[Terryscustom]

Terry..have you thought about G10 or Type 2 PVC or even Delrin for these parts to eliminated the side thrust vibration wear. I know this is your proto. Just asken.

Yup, G-10 is heavy so 1/8" birch ply will be plenty strong and check a few pics after this one and you can see that I have a nylon bearing installed in the part you are showing All the rest of the parts are made from lite ply with balsa end-caps. Great minds think alike though, thanks for pointing that out!!

 

[Pistolera]

I used the 3mm nylon snap-in thrust bearings from McMaster in my Krill wings, with solid CF hinge rods from ACP. The rods are not exactly round so a bit of light sanding was needed to get them to slide through the Krill ailerons, which have plastic/nylon sleeves already in place between the hinge points.

 

[Terryscustom]

I have noticed that as well with the solid carbon rods (like the one I used in my test dummy). They have a surface serration sort of from the mfg. process. The round carbon rods that have a hole in the middle are more of a machined smooth outside finish which is another reason I will be going that route. On TheLAW's hempel cub he used 1/8" rods which are nice but it has brass bushings so the bushings got sloppy and I had to switch to a rod that was a few thousandths larger. Kinda excited about the high quality rods with low wear bushings

 

[Wacobipe]

Terry...here's the idea I was considering for mine when I was thinking about doing the hinges like you...Details follow over the next few posts.

http://www.giantscalenews.com/threads/delro-2-5m-raven-build.1084/page-2#post-24623

There's some really neat (not cheap) nylons snap-in bearings that would work with a 4mm Carbon Fiber rod for the hinging

http://www.mcmaster.com/#catalog/121/1174/=w5c65o

 

[tylerzx9r]

Terry, You never stop amazing me! I like what I have seen. Do you really think it would be worth all the work in comparisons? Weight? Time? Throws? I had a CARF with similar hinges, The only advantage I can tell you I liked was the crispness in the air, and I was not a great pilot then ( or now for that matter) but have gotten much better at flying. I just cannot imagine it is worth all the trouble? I do think it is awesome, and really cool that you continually push the envelope!

 

[Terryscustom]

Do you really think it would be worth all the work in comparisons? Weight? Time? Throws? I had a CARF with similar hinges, The only advantage I can tell you I liked was the crispness in the air, and I was not a great pilot then ( or now for that matter) but have gotten much better at flying. I just cannot imagine it is worth all the trouble?

Tyler, I'll try to answer all your questions.

First I'd like to say that for me the thing that keeps me building is constant challenge and opportunity to learn.....there is always something to learn and push yourself mentally with airplanes. Remember, the entire reason I started designing and building planes is because a certain kit mfg. told me they did not feel comfortable selling me a kit (because I had never built one before).

- Worth all the work? It's only work if you make it work
- Weight? I did some comparison and as I have it designed the weight will be equal to just slightly more than standard hinging.
- Throws? Hell yea!!!!
- Crisp and precise flying? Double hell yea!!!!
- Trouble? No trouble at all, once the parts are drawn and cut it takes just slightly more time than tapering, installing, and sanding standard hinging surfaces.

 

[tylerzx9r]

Tyler, I'll try to answer all your questions.

First I'd like to say that for me the thing that keeps me building is constant challenge and opportunity to learn.....there is always something to learn and push yourself mentally with airplanes. Remember, the entire reason I started designing and building planes is because a certain kit mfg. told me they did not feel comfortable selling me a kit (because I had never built one before).

- Worth all the work? It's only work if you make it work
- Weight? I did some comparison and as I have it designed the weight will be equal to just slightly more than standard hinging.
- Throws? Hell yea!!!!
- Crisp and precise flying? Double hell yea!!!!
- Trouble? No trouble at all, once the parts are drawn and cut it takes just slightly more time than tapering, installing, and sanding standard hinging surfaces.

Thanks Terry, Just another mark on my list for reasons I like you! Thanks for challenging us to also push the envelope!

 

[Terryscustom]

Got my delrin bearing material today.....BAD ASS stuff, it's going to be great. However, the tolerance on the carbon tube was too tight so I had to place an order for some different carbon rods that will give about .007 clearance. With that tight of a clearance I will also be using shorter sections of the bearing stock instead of full length bearing sleeve throughout the assembly. I do have some carbon rods on hand that give a .014" tolerance but I think a little tighter will be good.

Foam for wings showed up today so if I get my work done it's time to play!

 

[Pistolera]

Cool! After you finish with this experiment you'll have to try the "offset" hinging like we talked about. This is the Sukhoi pic where you can see through the gap on the left wing with the aileron up. And the down aileron on the right wing clearly shows its leading edge protruding well above the wing.