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X-37 prop - what is it???

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X-37 prop - what is it???

Old 07-12-2004, 12:36 AM
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mocars2
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Default X-37 prop - what is it???

I was told to get a x-37 prop, for a 4mm shaft - but I've gone to tower and I don'tsee anything. Is this just a generic type term??? Any part #'s would be great.
Old 07-12-2004, 05:06 AM
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Ron Olson
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Default RE: X-37 prop - what is it???

Could it be an X-437 or X-637 prop? What is it going on?
Old 07-12-2004, 01:30 PM
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mocars2
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Default RE: X-37 prop - what is it???

It's going in a RS boat - from my thread - http://www.rcuniverse.com/forum/20t_...1141210/tm.htm

here's what someone else did and said

ORIGINAL: gulfstreamI
mocars,

I upgraded the prop on my RS boat. With the stock prop (X-37) I'd say the boat's speed is 6 - 8 MPH!
The new prop (smaller than stock) I used is a slightly agressive pitch X-35 plastic prop. I had to replace (cut) half the original stainless steel prop shaft.
I used the following materials for the upgrade:
1) 4 mm brass rod
2) 4 mm drive joint by Kyosho, part# 94901-4
3) 4 mm Drivedog & collet by ABC Hobby, part# 55015
4) X-35 plastic prop ( unknown brand ) Cost: $ 1.69
The boat now runs at about 8-10 MPH, not much because I'm still using my stock motor.

GulfstreamI
I've seen the x-4?? and x-6?? before - what does those 3 numbers mean? - Size? Pitch? What??

thanks
Old 07-12-2004, 03:56 PM
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Default RE: X-37 prop - what is it???

The 4 and 6 are the pitch times that number for a low lift prop in a way. For instance, the pitch on a 37mm prop would be 1.4 times 37. A lifting prop for instance uses a number like 14 to represent the 1.4 just to show you the difference between the two.
Old 07-13-2004, 12:30 AM
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mocars2
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Default RE: X-37 prop - what is it???

I understand the last 2 digits is the diameter, and the pitch is figured by X by 1..4 - but then what's the difference between a x-437 and x-637 for a non-lift prop? Also what's the x stand for - the diameter x 1.4 or what? So what was gulfstream really saying when he suggests a x-37?
Old 07-13-2004, 04:41 AM
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Default RE: X-37 prop - what is it???

Kyosho loosely copies the Octura props pretty much using their numbering system. An X-637 will have more pitch than an X-437 but the same diameter. I don't have my prop chart handy or else I could give you the exact numbers.

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