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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Tachometer Readings >> 25FX
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25FX - 5/19/2007 6:04:36 PM   
TailTwister


 

Posts: 2849
Joined: 1/26/2002
From: Menasha, WI, USA
Status: offline 		Can someone give me a few real tach numbers to look at?

25FX with what fuel and prop please???

I ran one today with a 9x6 wood prop and got 12,600 rpm, with a pinch test peaking at 13K. Is this engine producing the correct power, or not?

My intent is to use this engine on a 3D profile plane, likely with a 10x4 APC prop.

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Airplane Pimp
       Post #: 1

RE: 25FX - 5/20/2007 12:23:23 AM   
oceansfiftyseven



Posts: 168
Joined: 9/29/2004
From: Seattle, WA, USA
Status: offline 		10x4 mas 13,500
9x4 mas 14,400
8x6 3-Blade mas 13,800
These numbers are using Powermaster 15%
I have tried the apc 10x4 on this engine and it was not happy. It does like the mas 10x4 though. Must be a lower load on the engine.

(in reply to TailTwister)
       Post #: 2

RE: 25FX - 5/20/2007 12:27:39 AM   
TailTwister


 

Posts: 2849
Joined: 1/26/2002
From: Menasha, WI, USA
Status: offline 		Thanks for the numbers. I feel like mine is a bit low, but not horrible.

Any one else?

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(in reply to oceansfiftyseven)
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RE: 25FX - 5/20/2007 8:32:45 PM   
TailTwister


 

Posts: 2849
Joined: 1/26/2002
From: Menasha, WI, USA
Status: offline 		OK, I'm feeling better. I ran an APC 10x3 and some good fuel.

I can get 14,700 rpm, if I want to. I'll likely try to fly it a hint softer than that, however...

The 9x6 TF prop must load quite a bit heavier than the APC 10x3.

_____________________________

Airplane Pimp

(in reply to TailTwister)
       Post #: 4

RE: 25FX - 5/6/2008 3:16:09 AM   
SeamusG


 

Posts: 182
Joined: 6/16/2007
From: Westminster, CO, USA
Status: offline 		brand new OS 25 FX (3 tanks of 15%) with MAS 9x4 G/F G-3 nylon prop and AirScharnell Combat can (engine is running a bit rich and the can has not been tuned)
18,100 - 18,200


_____________________________

Experience is what ya get when ya don't get what ya want - me - SeamusG

(in reply to TailTwister)
       Post #: 5

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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Tachometer Readings >> 25FX
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