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Old 03-31-2014, 10:09 PM   #1
FlyWheel
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Angry I'm going frakking nuts!

This is the part of a folding prop that the blades attach to that is fitted onto the motor shaft (or adapter):
I have been looking for over a week trying to find one of these stupid things that will fit the 5mm diameter threaded prop adapter on my outrunner motor, but so far all I have found* are those that have an 8mm hole which is way too big for a 5mm shaft.

Am I missing a page? Is there some "sold separately" thingamabob that I don't know and none of the retailers are telling me about that I am supposed to buy so I can fit a 5mm shaft into an 8mm hole? Any motor or prop adapter for a motor that would have an 8mm shaft would be HUGE. Folding props are used on virtually every electric sailplane built, most of which use motors similar to the one I have. Unless it is for a very large scale NONE OF THESE MOTORS would be anywhere near big enough to have an 8mm motor or prop adaptor shaft; they would be around 5-6mm.

So where are the Gorram yokes that fit them?!

WHAT THE FRAK IS GOING ON??



(*straight bore, not tapered as in one that uses a collet)

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Old 03-31-2014, 10:31 PM   #2
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Since the desired part is not readiily available I would fill the 8mm hole with epoxy or Welders and redrill to 5mm--- or

1. wrap the motor shaft with electrical tape for a snug fit
2. use thin wall tubeing as a sleeve/spacer over the motor shaft
3. I guess surgical tubeing would work too

My 2 cents---Roger aka GIFLYRC

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Old 04-01-2014, 12:13 AM   #3
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There are many different types of folding prop adapters on the market. The one you show is for 8mm shafts.

http://www.ebay.co.uk/itm/like/31021...f14=108&ff19=0

http://www.hobbyexpress.com/spinners...rs_358_ctg.htm

http://www.giantshark.co.uk/group/24...ding-propeller
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Old 04-01-2014, 12:50 AM   #4
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Don't know if this will help you out great place to buy from.
http://www.alofthobbies.com/bb-foldi...-spinners.html
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Old 04-01-2014, 01:54 AM   #5
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get some brass tubing an insert those till you get the right size. if you lived closer i could just whip one up with the mill
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Old 04-01-2014, 03:56 AM   #6
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What about a collet prop adaptor that fits 5mm shaft but has 8mm OD ?

If the OD is not enough - then prop shaft rings ....

Here's a 5mm shaft collet with 8mm thread ... maybe a bit short - but gives the idea :

https://www.hobbyking.com/hobbyking/...t_collet_.html

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Old 04-01-2014, 04:10 AM   #7
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here ya go . . .http://www.headsuphobby.com/Folding-Props_c86.htm
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Old 04-01-2014, 04:56 AM   #8
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People please, you don't clamp a collet onto a threaded shaft, especially one made of a softer metal! <grimace> if it were that easy there are already folder spinners and yokes that have 5mm collets.

I'm thinking my best bet is going to be somehow coming up with a bushing of some sort (now I wish I hadn't retired, I could have had an entire CNC machine shop at my disposal!).

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Old 04-01-2014, 06:33 AM   #9
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Originally Posted by FlyWheel View Post
People please, you don't clamp a collet onto a threaded shaft, especially one made of a softer metal! <grimace> if it were that easy there are already folder spinners and yokes that have 5mm collets.

I'm thinking my best bet is going to be somehow coming up with a bushing of some sort (now I wish I hadn't retired, I could have had an entire CNC machine shop at my disposal!).
Well sorry .... but based on your OP - how were we to know you have a threaded SHAFT when you type threaded PROP ADAPTOR of 5mm.

Second - who puts a softer metal as shaft ? unless it's a home made shaft ...

I've put collets on to threaded shafts when necessary - so what's problem ?

Right ... so what is problem with putting shaft rings from propeller's to build out the shaft to prop holder hole ? If the shaft is threaded - then a thrust washer behind and in front to lock all together with the prop rings cantering it all.

What's the problem ? There is no real stress or weight on the rings, that's taken care of by the thrust washer surfaces to the prop holder and nut.

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Old 04-01-2014, 12:51 PM   #10
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Originally Posted by FlyWheel View Post
People please, you don't clamp a collet onto a threaded shaft, especially one made of a softer metal! <grimace> if it were that easy there are already folder spinners and yokes that have 5mm collets.

I'm thinking my best bet is going to be somehow coming up with a bushing of some sort (now I wish I hadn't retired, I could have had an entire CNC machine shop at my disposal!).
No problem - see my post #7. Heads Up RC has 5mm folder hubs with aluminum spinners. Also folder blades in various sizes. Heads Up ships cheap ($2) and fast.
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Old 04-01-2014, 04:33 PM   #11
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FlyWheel really has a chip on his shoulder with his smart comment. I could help out but I'm not going to do it.
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Old 04-01-2014, 05:49 PM   #12
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Originally Posted by carpetbagger View Post
No problem - see my post #7. Heads Up RC has 5mm folder hubs with aluminum spinners. Also folder blades in various sizes. Heads Up ships cheap ($2) and fast.
The folding spinners that fit 5mm are 2" in diameter, too big and they all attach using collets. However I think I'm going to go with just getting an APC plastic prop the same size as the folder. They re designed with a bore of 8mm BUT they also come with a pair of bushings, one of which has an I.D. of 5mm. The bushing will fit into the 8mm straight bore in some of the Aeronaut yokes. If the folder cannot be made to work this way then at least I'll have a straight prop to fall back on.

"Give a man a plane and he'll fly for a day.
Teach a man to build a plane and he'll fly for a lifetime"
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Old 04-01-2014, 05:52 PM   #13
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Kids...Kids! Flywheel is a bit overheated. You know how it can be at times when you can't solve something...and you don't realize the scope of your own ignorance. We've all been there.
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Old 04-01-2014, 06:26 PM   #14
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Originally Posted by FlyWheel View Post
.......I'm thinking my best bet is going to be somehow coming up with a bushing of some sort (now I wish I hadn't retired, I could have had an entire CNC machine shop at my disposal!).

Is this what you're looking for?

http://www.getfpv.com/propellers/prop-reducers.html

1015375 "...the BUG.....It's Awesome"
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Old 04-01-2014, 08:56 PM   #15
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Originally Posted by CrimzonRider View Post
PERFECT!! Thank you!!
(will you marry me?)




(Just kidding about the last part )












(Unless you're a single female, of course. Then maybe... )

"Give a man a plane and he'll fly for a day.
Teach a man to build a plane and he'll fly for a lifetime"
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Old 04-01-2014, 10:06 PM   #16
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Originally Posted by FlyWheel View Post
PERFECT!! Thank you!!
(will you marry me?)

(Just kidding about the last part )

(Unless you're a single female, of course. Then maybe... )

100% manly man farmer rancher dude with boots here.....lol

Anywho, I also remember seeing a wider range of items, if my memory still working right, I think they were sold by Cermark, the seller of NeoDym Motors(one of my favs), right here in the USA.

Good luck to ya.

cr

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Old 04-02-2014, 01:46 AM   #17
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Thank you again. That site will definitely be in my favorites!

"Give a man a plane and he'll fly for a day.
Teach a man to build a plane and he'll fly for a lifetime"
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