Rotors

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Draylon Fogg
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Re: Rotors

Postby Draylon Fogg » April 5th, 2011, 5:50 pm

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 » April 5th, 2011, 6:02 pm

Oh. That beam is just dead weight, IMHO. Unless you really need it.
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Re: Rotors

Postby Draylon Fogg » April 5th, 2011, 6:13 pm

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 » April 5th, 2011, 6:23 pm

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 » April 5th, 2011, 7:43 pm

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 » April 5th, 2011, 9:16 pm

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 » April 6th, 2011, 3:50 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 » April 6th, 2011, 9:37 am

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 » April 7th, 2011, 12:04 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 » April 7th, 2011, 3:04 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 » April 7th, 2011, 4:44 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 » April 7th, 2011, 7:32 pm

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 » April 8th, 2011, 5:21 am

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 » April 8th, 2011, 6:54 am

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 » April 8th, 2011, 2:55 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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