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Author Topic: OS 10FP venturi and prop  (Read 2548 times)

Offline Tim Wescott

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OS 10FP venturi and prop
« on: September 08, 2016, 07:55:41 PM »
An OS 10FP has come into my possession.  It has a custom -- and seemingly severely undersized -- venturi, and at 8-4, a severely oversized prop.  The thing doesn't want to stay running; before I do anything else I want to get it set up correctly and see what it'll do.

What's the right size for the venturi on the 10FP?
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Offline Motorman

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Re: OS 10FP venturi and prop
« Reply #1 on: September 08, 2016, 09:00:19 PM »
I had a stock Cox .049 venturi (.118") on an LA 10 with 7-3 prop. If you have an OS spray bar across the hole the right size (5/32"?) would look tiny. 

MM
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Offline Akihiro Danjo

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Re: OS 10FP venturi and prop
« Reply #2 on: September 09, 2016, 01:45:57 AM »
Quote from: Tim Wescott on September 08, 2016, 07:55:41 PM
What's the right size for the venturi on the 10FP?

Hi Tim san,
Please read this thread.
Stock venturi is 6.0mm and the stock NVA is (4.0mm stepped down) 3.5mm.
Aki

http://stunthanger.com/smf/open-forum/os-la10-useful-or-not/
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Offline Tim Wescott

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Re: OS 10FP venturi and prop
« Reply #3 on: September 09, 2016, 10:03:58 AM »
Quote from: Akihiro Danjo on September 09, 2016, 01:45:57 AM
Hi Tim san,
Please read this thread.
Stock venturi is 6.0mm and the stock NVA is (4.0mm stepped down) 3.5mm.
Aki

http://stunthanger.com/smf/open-forum/os-la10-useful-or-not/

Thank you Aki san.  That is exactly what I needed -- I have metal and plastic, I have a lathe, I have enough skill to make a venturi.  I just didn't have a clue of what sized hole I needed to make!!

This should get me on the road.
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The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Mark Scarborough

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Re: OS 10FP venturi and prop
« Reply #4 on: September 09, 2016, 10:48:59 AM »
Quote from: Tim Wescott on September 09, 2016, 10:03:58 AM
Thank you Aki san.  That is exactly what I needed -- I have metal and plastic, I have a lathe, I have enough skill to make a venturi.  I just didn't have a clue of what sized hole I needed to make!!

This should get me on the road.
sheesh Tim, its easy, make it the proper size,, the size that promotes proper suction, proper mixture, and atomizes the fuel properly,, how hard is that, LOL D>K H^^
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Offline Tim Wescott

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Re: OS 10FP venturi and prop
« Reply #5 on: September 09, 2016, 01:46:06 PM »
Quote from: Mark Scarborough on September 09, 2016, 10:48:59 AM
sheesh Tim, its easy, make it the proper size,, the size that promotes proper suction, proper mixture, and atomizes the fuel properly,, how hard is that, LOL D>K H^^

Oh thank you Mark.  I'll just look in my drill index for one marked "the right size" and use that.  Why didn't that occur to me before?

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The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Geoff Goodworth

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Re: OS 10FP venturi and prop
« Reply #6 on: September 09, 2016, 10:53:30 PM »
Aki's comments are correct re the spraybar. However, I've run mine using an APC 8 x 4 and it seems like a powerhouse.
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