Sequoia 2m - Build log

[Wayne]

Pretty much the case there everyday.

 

[thenated0g]

Seeing that I'm going to be putting some more aerodynamic covers over the top there is no need to seal The entire hole with wood so I just cut these little plastic lids to keep everything light and these will keep the servos in place without using any glue.

 

[Old_Salt]

How deep are the servo mounting holes? What is the thickest servo that will fit without protruding from the wing? I am assuming a cover that follows the wing contour. How thick is the cover you are intending?

Thanks.

 

[thenated0g]

Sorry, havent checked it yet, ill get some measurements soon. It is not even though. The leading edge side of the hole is deeper than the trailing. The specific covers i am going to use are these ones here:

Servo Cover - Large Flat

Finally a nice servo cover for a reasonable price. Includes one pair, right and left. Vacuum molded plastic covers are light in weight and reduce drag produced by exposed linkages.

alofthobbies.com

My plan is to use some scotch double sided tape and than white vinyl orientation stripes will keep the edges down. The plastic is very thin and has some give so it will go over any protrusions if the wires/servos are slightly high.

 

[Konrad]

I find that Scotch double sided tape like what some use for paper projects not to be strong enough. Try to find some weak carpet tape often used to keep throw rugs in place.

 

[Old_Salt]

Hi Nate,

My first inclination was to suggest dual sided KAPTON tape. ULINE is one source.

There are numerous alternates offered here. 3M provides a phone number for the tech support line to get you to the perfect choice.

https://www.3m.com/3M/en_US/company-us/all-3m-products/~/All-3M-Products/Adhesives-Tapes/Industrial-Adhesives-and-Tapes/Adhesive-Transfer-Tapes-Double-Coated-Tapes/Double-Coated-Tapes/?N=5002385+8710676+8710815+8710955+8711017+8713638+3294857497&rt=r3

No rush, but when you get to a point when it is easy to measure the servo pocket inside dimensions (front and back) I would appreciate that information. I am many months away from actually needing the dimensions.

 

[thenated0g]

oh you want the diameter, i have that, let me pull up my svg file and see what my hole size is. ......

49mm drops in nice with some room for epoxy around it. So probably 50-51mm is the size.

 

[thenated0g]

also, i ordered some of that kapton tape. never used it before so be good to have it for testing if nothing else.

 

[Wayne]

Goodness, for servo covers just use the same darn tape you use for wrapping a present. Nothing fancy needed! Thin, clear and sticky will do the trick.

 

[Konrad]

Goodness, for servo covers just use the same darn tape you use for wrapping a present. Nothing fancy needed! Thin, clear and sticky will do the trick.

But it will look like a tape job. Double sided looks much better. After all image is everything!

 

[thenated0g]

@Wayne so your saying dont double stick it down, just tape it down over the top? That was my plan with the vinyl, 2 birds one stone. It would be my orientation stripe and hold it down. I figured the double sided tape wouldnt hurt.

 

[Konrad]

Does the vinyl have good adhesive properties?

 

[thenated0g]

With some heat applied it sticks pretty good. Nice thing is with some heat you can peal it off if your not happy so im confident with at least giving it a try. But i will know as soon as i put i down on the veneer if it sticks well enough or not. After applying it you warm it up with a heat gun and press it down with a cloth or squeegee you can see it stick down into all the pores of whatever its stuck too.

 

[Konrad]

Watch the heat limit of the servo covers.

 

[Old_Salt]

Just for clarification, I m looking for hole depth with the idea of confirming that the selected servos are sufficiently thin to fit inside the wing and thus not disturb the airfoil.

KAPTON is common around electronics and a deep amber color. It also resists heat well although I do not expect that to be an issue.

Thanks.

 

[bracesport]

@thenated0g - or.... you could do this (IDS)

 

[thenated0g]

@Old_Salt Ok i have some calipers and will measure the thickness of the wing at both extremes.
@bracesport I have seen that video, those are awesome.

Got one flap servo and horn in place, got pretty close to 90 degree. Servo cover is not taped yet. Just checking for fit.

***edit - Also i am putting my money where my mouth is (is that how the saying goes?). That control horn is some 1/16th baltic birch i cut out for Aloft, will be in the store at some point. I put a little bit of thin ca into the wood to harden it, thought it wouldnt hurt, and than epoxy/filler into place. Figured i better test these out on one of my own planes

 

[Konrad]

Looking good. While I like 90° flaps they are not my main goal with flaps. I like to see the flap be able to come up 20° to 30° to aid in aileron rolls. If I have to I'll sacrifice some down flap motion to get this upward reflex in the flap. I think I see in the first photo some geometry that limits the upward going flap.

 

[Wayne]

Looks really good Nate!

 

[chadbastian]

Thanks @Hank GB Z . There are a ton of other ways to cut these and they have been done that way a hundred times before but having said that, having a laser is pretty great. The no noise and mess while cutting with a laser allows me to work in my shop before my daughter wakes up for school. And repeatable cuts and small changes are just a couple keystrokes and than 30 seconds later i have my new set of mounts.

I plan on doing the same for the fuselage tray that will hold all the electronics. I just need to get the ballast tube in first so i know what space i have left.

Would you consider selling me the cut pieces for the servos and the fuse? I do not have a laser cutter... Chad 805-403-1859