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RCV 120 SP props ?

Old 01-17-2022, 02:50 PM
  #1  
SJN
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Default RCV 120 SP props ?

Hi

I have got this brand new RCV 120 SP that I want to get running.
What size prop should I get ?
I have searched the internet, and I get everything from 18x10 to 22x18 props......a crazy gap.

I know that rpm should be at 500-5600 on the prop, but I dont have a bunch of high pitch props to test out, and they are very expensive to just go out and buy a few and try out.

I want to use it on a warbird, so it needs some speed. APC 18x14 maybe ?

I have bolted it on to my H9 Ultra stick for break in.



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Old 01-17-2022, 04:04 PM
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706jim
 
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While I'm not sure of the best propeller size, you've done the right thing:

Photographed the engine before running it as it will never be this clean again!

I'd suggest 18 x 10
Old 01-17-2022, 07:44 PM
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the Wasp
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here you go,,,
Jim

RCV 120-SP

RCV 120-SP vs. Saito

https://www.modelflying.co.uk/forums...investigation/

Flying Sites - R/C Aero Portal - RCV ENGINES
Old 01-18-2022, 01:29 AM
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SJN
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Thanks, I have seen those. :-)
I was hoping for some practical experiance.....like " I have a spitfire and it flys great with a 18x14 prop "
But I guess not many fly these engines compared to the "normal" 4 strokes. :-)

I have an APC 18x10 in my prop stash, and will have to see what RPM`s I get out of that.
But thinking it must need a 14 og 16 pitch to get the plane moving when the prop speed is at half of the normal rpm.
Old 01-18-2022, 05:18 AM
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Jesse Open
 
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A very interesting engine. Quite a feat, making that right angle turn with power delivery in such a lightweight and compact package.
The gearing places some pretty heavy demands on available lubrication no doubt.
Old 01-18-2022, 12:51 PM
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1967brutus
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Originally Posted by SJN View Post
I have an APC 18x10 in my prop stash, and will have to see what RPM`s I get out of that.
But thinking it must need a 14 og 16 pitch to get the plane moving when the prop speed is at half of the normal rpm.
I think it'll be OK... my 10,5 kg FW190 did pretty well with a 10" pitched prop spinning 5600 RPM on the ground (it gained about 1000 RPM in the air).
Different engine (ASP radial) but comparable RPM, and quite a heavy bird...
Old 01-18-2022, 01:52 PM
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SJN
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Went to the local hobbyshop, and they had a APC 18x12, so I bought that. They also have a 19x14.....but will try the 18 first :-)

We will see how it works out :-)



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