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Author Topic: Prop pitch  (Read 1449 times)

woodley miniman

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Prop pitch
« on: October 16, 2013, 06:00:42 PM »

Hi all, I've purchased this boat off eBay http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=281179149559&ssPageName=ADME:X:RTQ:GB:1123  and I want to replace the prop, it goes really well with the prop that's on the boat but I'm not what the pitch of the prop is, I know it's a 45mm with a dog key.
Thank you.

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nemesis

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Re: Prop pitch
« Reply #1 on: October 19, 2013, 09:16:20 PM »

Hi, If it goes well Why change , KISS.  Nemesis
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RAAArtyGunner

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Re: Prop pitch
« Reply #2 on: October 19, 2013, 10:28:46 PM »

Hi, If it goes well Why change , KISS.  Nemesis

Exactly  O0 O0 O0
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Gunna build those other boats one day.

CGAux26

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Re: Prop pitch
« Reply #3 on: October 20, 2013, 03:52:50 AM »

In answer to the original question, I think the pitch of scale boat props is usually equal or nearly equal to the diameter.  Ergo, 45 mm diameter, 45 mm pitch.  Check the Prop Shop website and other prop vendors' sites.
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woodley miniman

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Re: Prop pitch
« Reply #4 on: October 21, 2013, 04:14:11 PM »

Thats great thank you, I'll check with the prop shop. The only reason why I want to change the prop is there are a few nasty nicks in the prop and a small bit missing.  I have used a file and done the best I can, i thought I might as well change the prop.
 
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boatmadman

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Re: Prop pitch
« Reply #5 on: October 21, 2013, 05:11:13 PM »

Hi,
I cant see the prop on the pics of the original listing, but from the description of the boat and its speed, I would suggest the prop pitch is 1.4 x the diameter. That is a common pitch ratio for fast electrics.


Try astec models, or prestwich models for advice, they both do a lot in fast electric boats


Ian
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if at first you dont succeed.....have a beer.....

woodley miniman

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Re: Prop pitch
« Reply #6 on: October 21, 2013, 06:36:51 PM »

Great!!!!  Cheers Ian, I'll look on their web sites and call them in the morning.  :-)
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David Shaw

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Re: Prop pitch
« Reply #7 on: October 21, 2013, 07:18:56 PM »

If your rpm is under approx. 32000 try the Graupner K series props. Astec sell them and I also buy them from Gliders UK.
Over that rpm you will end up throwing the blades on plastic composite props.
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David Shaw
BMPRS No.1
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