Back at it (REVO series thread)

Re: Back at it :)

PostPosted: Mon May 25, 2015 3:14 am

Looks like a CAD drawing?

Where's some balsa porn!!!
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Re: Back at it :)

PostPosted: Mon May 25, 2015 6:33 am

iBang wrote:Wing is coming along. Some of the unique features are coming together, lets see who can pick them out :)

Don't see any thing original yet that hasn't been done before, but I'll keep watching :tu:
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Re: Back at it :)

PostPosted: Mon May 25, 2015 7:38 am

Carbon for spars, no sheeting or sheer webs? But maybe your just not done drawing
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Re: Back at it :)

PostPosted: Mon May 25, 2015 8:32 am

It looks like a carbon tube leading edge with no sheeting, shear webs with carbon strips for the spar, a single strip trailing edge in the center of the rib, looks like the plan will show airfoiled and already clipped off corners. It looks like you will need something to hold the trailing edge shape. Looks like it may be named Revo.
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Re: Back at it :)

PostPosted: Mon May 25, 2015 9:24 am

Ribs and shear webs are interlocking
Back to the Mad ribs, constant thickness
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Re: Back at it :)

PostPosted: Mon May 25, 2015 11:25 am

Good eyes on a lot of bros, I'm not surprised!

At the moment the list is something like: one piece CNC sheer web, self jigging build, CF spars and leading edge, one bolt externally accessible RW assembly, no LE sheeting, no sub spars.

On a singular note, it isn't a mad or constant height airfoil, however it builds flat to the top of the bench so from the angle I took the screen shot it looks constant height. The airfoil is completely new and of my own design.

I'm pretty sure that most of what I've done so far has been done elsewhere, if not exactly the same way. I'm not done yet though and I think that some of the stuff I have in mind has never seen a profile before :)
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Re: Back at it :)

PostPosted: Mon May 25, 2015 3:28 pm

phreddy wrote:It looks like a carbon tube leading edge with no sheeting, shear webs with carbon strips for the spar, a single strip trailing edge in the center of the rib, looks like the plan will show airfoiled and already clipped off corners. It looks like you will need something to hold the trailing edge shape. Looks like it may be named Revo.




If you just use a zippered Laminar wing, wire landing gear and intigrated control horns you could call it "Xerox"






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Re: Back at it :)

PostPosted: Mon May 25, 2015 7:01 pm

Without front sheeting or sub spars, won't it be hard to apply the covering? Seems like it would sag into the bays quite a bit.
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Re: Back at it :)

PostPosted: Mon May 25, 2015 7:24 pm

iBang wrote:
iBang wrote:Wing is coming along. Some of the unique features are coming together, lets see who can pick them out :)
If people are willing to pay for it and build it when I'm done I'll make kits, otherwise it will remain one-of-a-kind.


Sounds Expensive :drunk:
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Re: Back at it :)

PostPosted: Mon May 25, 2015 9:08 pm

Can you get rid of the elevator counter balances?
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Re: Back at it :)

PostPosted: Tue May 26, 2015 1:45 am

joebob wrote:Without front sheeting or sub spars, won't it be hard to apply the covering? Seems like it would sag into the bays quite a bit.


I'm going to discuss that with a few of the pro cover-ers to get their opinions. Skeeters have been done for years with nothing more than a piece of 1/16th balsa for a leading edge. I feel like you may have to be a little careful in how covering is applied but it should be possible. I suspect there will be some sag and visible scalloping between ribs but I'm less concerned with looks than I am with weight and performance and by my calculations I've so far taken something like a half pound out of the wing alone. My last bird of this size was 4.25lbs. I think I can hit the sub-3lb mark even with the added weight of RW hardware.

A.D.3D wrote:Can you get rid of the elevator counter balances?


I could but caps just don't look right without them. The fuse profile I settle on will determine how the elevator and rudder look.
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Re: Back at it :)

PostPosted: Tue May 26, 2015 1:50 am

For fun, more work and another angle. Working in 3D is interesting. Much more difficult than 2D but I can also do some unique things that are allowing me to design some parts I otherwise would have previously simplified.

Ignore the floating servo cutout - I'm working on placing the servo rails presently and that's just an artifact of that.

I'm also considering tweaking the ailerons a bit... wish I had some more data on 'foiled 'rons. WCB, I'm going to be calling you to pick your brain on how the radyak worked out.
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Re: Back at it :)

PostPosted: Tue May 26, 2015 2:02 am

Ian you need to look at the torsion aspects of the wing. Right now the covering is the only thing keeping it from twisting.
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Re: Back at it :)

PostPosted: Tue May 26, 2015 8:51 am

iBang wrote:I'm also considering tweaking the ailerons a bit... wish I had some more data on 'foiled 'rons. WCB, I'm going to be calling you to pick your brain on how the radyak worked out.



You should come to Beaver Bro and/or Athol. Collect all the first hand data you want :drink:
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Re: Back at it :)

PostPosted: Tue May 26, 2015 9:49 am

iBang wrote:
joebob wrote:Without front sheeting or sub spars, won't it be hard to apply the covering? Seems like it would sag into the bays quite a bit.


I'm going to discuss that with a few of the pro cover-ers to get their opinions. Skeeters have been done for years with nothing more than a piece of 1/16th balsa for a leading edge. I feel like you may have to be a little careful in how covering is applied but it should be possible. I suspect there will be some sag and visible scalloping between ribs but I'm less concerned with looks than I am with weight and performance and by my calculations I've so far taken something like a half pound out of the wing alone. My last bird of this size was 4.25lbs. I think I can hit the sub-3lb mark even with the added weight of RW hardware.

A.D.3D wrote:Can you get rid of the elevator counter balances?


I could but caps just don't look right without them. The fuse profile I settle on will determine how the elevator and rudder look.



Yeah.....ok :drunk:
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Re: Back at it :)

PostPosted: Tue May 26, 2015 10:50 am

PAR wrote:Ian you need to look at the torsion aspects of the wing. Right now the covering is the only thing keeping it from twisting.



I've got some ideas where that is concerned that aren't on the CAD drawing. I'll give you a call some time to get your opinions on them.

A.D.3D wrote:
iBang wrote:
joebob wrote:Without front sheeting or sub spars, won't it be hard to apply the covering? Seems like it would sag into the bays quite a bit.


I'm going to discuss that with a few of the pro cover-ers to get their opinions. Skeeters have been done for years with nothing more than a piece of 1/16th balsa for a leading edge. I feel like you may have to be a little careful in how covering is applied but it should be possible. I suspect there will be some sag and visible scalloping between ribs but I'm less concerned with looks than I am with weight and performance and by my calculations I've so far taken something like a half pound out of the wing alone. My last bird of this size was 4.25lbs. I think I can hit the sub-3lb mark even with the added weight of RW hardware.

A.D.3D wrote:Can you get rid of the elevator counter balances?


I could but caps just don't look right without them. The fuse profile I settle on will determine how the elevator and rudder look.



Yeah.....ok :drunk:


Ok ok, you have me there. I guess there are places I am concerned with looks :)
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Re: Back at it :)

PostPosted: Tue May 26, 2015 11:17 am

PAR wrote:Ian you need to look at the torsion aspects of the wing. Right now the covering is the only thing keeping it from twisting.




I don't know much about much, but I agree with PAR.

With them big built up foiled rons, the aileron swervo needs to be anchored into something solid. When the rons flex they will fight not only the wing which they are mounted into, but also what's forcing them to move and stay moved. Having them swervos close to the root will help fight the forces against the swervos, but that wing will twist me thinks.


Even with my wings sheeted and using carbon tow/balsa spars I can twist the wing before it's covered. I agree the covering gives the wing lots of strength, but the covering needs an anchor and there really doesn't seem to be alot there to give the covering something to reinforce.......after all, the cote is just cellophane essentially.

And why the emphasis on so light? I know it has alot to do with personal preferences, but these slabs have so many square inches and they are so superlight, they are like remote controlled kites.


You might build a very light and stiff bird, that flies great right up till you dork it. Dorkability is a huge factor for me.......my thumbs no worky so good-a.
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Re: Back at it :)

PostPosted: Tue May 26, 2015 11:37 am

Also, there seems to be no place for hinges to anchor to. Gonna need some trailing edge stock me thinks. Never mind I see it now.
Last edited by rcaircraftnut on Tue May 26, 2015 12:20 pm, edited 1 time in total.
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Re: Back at it :)

PostPosted: Tue May 26, 2015 12:09 pm

In regards to wing and aileron stiffness, keep in mind (depending on how you do the hinge line) that the traditional method used on the RazorYak makes for two pretty good size pieces of lumber on the TE of the wing and the LE of the aileron. Currently using 3/8" material for the RadYak 57 to get enough throw. The built up ailerons with the diagonal bracing are pretty stout.
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Re: Back at it :)

PostPosted: Tue May 26, 2015 12:11 pm

West Coast Bro wrote:In regards to wing and aileron stiffness, keep in mind (depending on how you do the hinge line) that the traditional method used on the RazorYak makes for two pretty good size pieces of lumber on the TE of the wing and the LE of the aileron. Currently using 3/8" material for the RadYak 57 to get enough throw. The built up ailerons with the diagonal bracing are pretty stout.



I should have said when the rons are given input. The way the drawing is above, the rons would be stronger than the wings.
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