Making propellers

Bitconnect
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Making propellers

Postby Bitconnect » January 8th, 2019, 4:49 pm

I was wondering exactly how you make propellers. Ikara ones keep on breaking for me. I’ve heard of using plastic cups and cutting blades from them or wetting balsa sheets and making blades from those. I know you need to put piano wire through the prop but how exactly would you make blades, spars, and the hub?

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Re: Making propellers

Postby bjt4888 » January 8th, 2019, 4:52 pm

Bitconnect,

Jeff Anderson posted several very informative links earlier in this wiki that include custom propeller construction details. You could start be reviewing these links.

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Re: Making propellers

Postby Bitconnect » January 8th, 2019, 4:56 pm

Ok I’ll check those out

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Re: Making propellers

Postby Bitconnect » January 8th, 2019, 5:04 pm

Where did he post the links? Is it in a prior year’s forum?

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Re: Making propellers

Postby bjt4888 » January 8th, 2019, 5:35 pm

Bitconnect,

Good job responding quickly. This year’s Wright Stuff wiki (this wiki). Page 4 of the thread titled “Wright Stuff C”. Once you get going on this research, message back with any questions you have.

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Re: Making propellers

Postby Bitconnect » January 8th, 2019, 5:36 pm

Oh... I went to the 2015 forum and found a discussion about bucket props you had back then with Jeff. I'm reading an INAV article on bucket props right now.

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Re: Making propellers

Postby CrayolaCrayon » January 8th, 2019, 5:55 pm

The ikara props are breaking? I've had my ikaras go through A LOT of obstructions, and have never had a single one break. What is making them break?
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Re: Making propellers

Postby bjt4888 » January 8th, 2019, 6:12 pm

Bitconnect,

Good job. Also look at Hip Pocket Aeronautics Penny Plane and F1L design threads.

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Re: Making propellers

Postby bjt4888 » January 8th, 2019, 6:14 pm

Our experience is the same as Crayola’s. We’ve never broken an Ikara and get very good performance from them after modifying.

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Re: Making propellers

Postby Bitconnect » January 8th, 2019, 6:17 pm

Might have something to do with me changing the pitch frequently. Every time I did that the plastic gradually got weaker and one crash eventually broke my propeller. I went through several this week. As far as I know, you use pliers to twist the spar gently. I don't know why mine are getting much weaker.

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Re: Making propellers

Postby CrayolaCrayon » January 9th, 2019, 6:39 am

It might be a bad set. Where are they breaking? Off the spar?
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Re: Making propellers

Postby coachchuckaahs » January 9th, 2019, 11:14 am

Our experience years ago is that repeated adjustments to pitch did eventually lead to failure. 1 or 2 adjustments were fine. Try to spread the adjustment across the entire exposed spar rather than in a very tight region. Better to have multiple props, each set to a major pitch adjustment, then limit additional adjustments to very small amounts near the initial major adjustment.

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Re: Making propellers

Postby Bitconnect » January 9th, 2019, 12:54 pm

I’m going to try to make a prop wth adjustable pitch by having round spars that fit very tightly into a hub. This should solve my problems with pitch changing. My plane is several grams underweight so I think this is feasible right now

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Re: Making propellers

Postby Bitconnect » January 9th, 2019, 12:55 pm

The thin spar that connects to he blade snapped. One time the thick portion just started cracking and eventually broke

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Re: Making propellers

Postby klastyioer » January 9th, 2019, 2:04 pm

Bitconnect wrote:The thin spar that connects to he blade snapped. One time the thick portion just started cracking and eventually broke


oh thats weird its props cause ur pitch changing
with us the only part that snaps is the connected blade to spar part like the blade will crack from impact sometimes
but yea def try making props if u wanna mess w pitch
honestly, it's not about the medals. go out there and have fun. make progress, learn a few things, have one heck of a time, because that's all that matters.


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