Rotors

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Draylon Fogg
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Re: Rotors

Postby Draylon Fogg » Wed Apr 06, 2011 12:50 am

like he had the rotor and a beam in the middle connecting the ribs, for extra support
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Re: Rotors

Postby thewinner » Wed Apr 06, 2011 1:02 am

Oh. That beam is just dead weight, IMHO. Unless you really need it.
Last edited by thewinner on Wed Apr 06, 2011 1:25 am, edited 1 time in total.
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Re: Rotors

Postby Draylon Fogg » Wed Apr 06, 2011 1:13 am

not necessarily, using the right density it could be very helpful in maintaining support in the middle of the rotor
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Re: Rotors

Postby thewinner » Wed Apr 06, 2011 1:23 am

Oh well. Anyway, sorry for being blunt. But in my opinion, that beam is not neccessary.
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Re: Rotors

Postby Draylon Fogg » Wed Apr 06, 2011 2:43 am

not necessarily, yours may be fine but if someone's rotor is to flimsy, then a center beam may be just what the person needs.
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Re: Rotors

Postby kjhsscioly » Wed Apr 06, 2011 4:16 am

It would all depend on the size of the wood you use for the spars and ribs - if they are particularly thin, it could be vital

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Re: Rotors

Postby illusionist » Wed Apr 06, 2011 10:50 am

Has anyone used basswood for the spars? If so, how does it compare to balsa (both in 1/16 x 1/16) in terms of performance and weight?
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Re: Rotors

Postby Draylon Fogg » Wed Apr 06, 2011 4:37 pm

bass is a lot heavier, it's stronger but still way heavier so depending on how yours flies i would probable stick with balsa or if you want bass use a very low density
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Re: Rotors

Postby illusionist » Thu Apr 07, 2011 7:04 pm

I think this has come up before, but has anyone collected reliable, accurate data on the effects of cambered (curved) ribs? I know that they have a positive effect, but I am curious as to how beneficial this is to flight time. I plan on trying it out myself, but wanted to do some "research" first.
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Re: Rotors

Postby kjhsscioly » Thu Apr 07, 2011 10:04 pm

illusionist wrote:Has anyone used basswood for the spars? If so, how does it compare to balsa (both in 1/16 x 1/16) in terms of performance and weight?


I tried, but without glue, which means I cut all the pieces and massed them in length, but it would have made a helicopter well over four grams with two rotors. I personally don't recommend unless you motorstick is super light, or you basswood is very low density.

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Re: Rotors

Postby lllazar » Thu Apr 07, 2011 11:44 pm

No point at all to use basswood. I mean, they are stronger, but u don't need that much strength, and the added mass certainly isn't worth it.
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Re: Rotors

Postby kjhsscioly » Fri Apr 08, 2011 2:32 am

Precisely. Balsa is quite strong when supported by ribs and covered on mylar. I haven't ever had an issue with spars breaking, and I never built basswood.

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Re: Rotors

Postby illusionist » Fri Apr 08, 2011 12:21 pm

I haven't had any issues either, but since it came up that stiffere spars work best, is it worth it. I'm jsut going to stick with the balsa spars i'm using now
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Re: Rotors

Postby jander14indoor » Fri Apr 08, 2011 1:54 pm

Nothing is worth being over the minimum weight! Nothing! Well except maybe just enough to make sure you don't get second tiered. But NO other reason.

Remember, balsa is hugely variable in its qualities. If you want stiffer spars, cut many, sort out the ones to target weight, then select the stiffest. You will find a big difference for seamingly identical weight and size spars. You can improve stiffness a LOT that way. Course you throw out a lot of wood unless you can find some less critical use for it. But you will get significantly better helicopters.

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Re: Rotors

Postby kjhsscioly » Fri Apr 08, 2011 9:55 pm

my partner organizes and numbers all of her wood by density. It seems like a lot of work, but it pays off when building.


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