Saito FA-125 Prop for speed  
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Saito FA-125 Prop for speed - 5/1/2008 1:37:34 PM   
Chancho


 

Posts: 31
Joined: 8/31/2007
From: Farmington hills , MI, USA
Status: offline 		Gents,

I need your help. I have a Saito FA-100 that is going in for service and I'm planning on putting an new FA-125 in it's place. The FA-100 was turning a 13x11 more than just fine and I'd like similar or better results in the speed department.

The FA-125 advertizes 15x7 - 17x6. I'd like to run a 14x11,12, etc... Does anyone have any thoughts or experience in regards to using the FA-125 for speed?

* Plane weight is 7.5 lbs.
* I'm running %15 Nitro, all synthetic and 3.5 oz of Castor oil in each gallon.

Thanks in advance for the help and Best Regards,

Phil Green
       Post #: 1

RE: Saito FA-125 Prop for speed - 5/1/2008 1:57:26 PM   
proptop



Posts: 4426
Joined: 10/18/2002
From: Rome, NY, USA
Status: offline 		I was thinking maybe a 14x12...
APC also has a 13.5x13.3 "1.20 size" pattern prop...maybe that one?

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(in reply to Chancho)
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RE: Saito FA-125 Prop for speed - 5/1/2008 2:06:51 PM   
Ed Cregger



Posts: 7494
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline 		The 13.5 x 13 sounds like a winner to me.


Ed Cregger


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"Flying models since the Fifties - I'll get the hang of this yet!!!"

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RE: Saito FA-125 Prop for speed - 5/1/2008 10:07:45 PM   
Harry Lagman


 

Posts: 1118
Joined: 11/19/2003
From: Auckland, NEW ZEALAND
Status: offline 		I'd try several including the existing 13 x 11 (should do somewhere around 10K static), the suggested 13.5 x 13.3 and an APC 13 x 13 Narrowblade. Try a couple of 14s too like the APC 14 x 10 and 14 x 12.

Be sure to try a few props out - the "best prop" selection depends on four sets of data: your airframe's aerodynamic characteristics, your engine's power delivery characteristics, your flying style and your overall criteria of what is "best".

(in reply to Chancho)
       Post #: 4

RE: Saito FA-125 Prop for speed - 5/2/2008 2:33:17 AM   
Chancho


 

Posts: 31
Joined: 8/31/2007
From: Farmington hills , MI, USA
Status: offline 		Thanks All!

I really appreciate everyone's knowledge and feedback. I printed this page out at work and afterwards it was off to my LHS. Dave, at Joe's Hobby by the house, didn't have anything past a 13x11 in the 13 size. He looked up the 13x12, and 13.5x13.3 etc, but showed discontinued by APC. (I'm sure I can find one on line somewhere..) I took home a 14X12 and will try that along with the 13x11. Before blowing the cage out of my Saito 100 bearing case, it turned the 13x11 9300 RPM static. I tuned it down to 8900 RPM which gave it plenty of room to run out in flight. It was a delicate setting to be sure not to lean it out too much and cause an overload situation. Anyhow, maybe the extra %22 HP in the FA-125 will turn the 13x11 a few more RPM or maybe it's enough to swing the 14x12? Hopefully, weather prevailing, I can find out and post the results.

Best Regards,

Phil Green

(in reply to Harry Lagman)
       Post #: 5

RE: Saito FA-125 Prop for speed - 5/6/2008 4:01:52 AM   
Chancho


 

Posts: 31
Joined: 8/31/2007
From: Farmington hills , MI, USA
Status: offline 		Well, I found the recommended props and tried them. My engine is probably still not broken in as I only have 2 gallons thru it. I tried the 14x12 - wouldn't spin up. Tried the 13x13 - Not.. Tried the 13x13N and it liked it. 9500 RPM static, same as 13x11. Problem was that when it went up in the air it never unloaded.. I put the 13x11 back on and it ran it solid all day, 11 flights, with small adjustments here and there. With the Saito 125 vs. the 100 I have truly unlimited vertical with the Revolver and the 13x11 prop. Where as with the 100, it couldn't do the "Unlimited" vertical. Speed... I almost want to say that the Saito 100 was faster with the 13x11 than the 125. It could be the extra 1000 max RPM. So I guess with the 125 you've got a bit more torque, but you sacrifice your max RPM. Not the massive %20 gain I was expecting, but after reading others reviews about the 125, I guess I'm on par.

Thanks again for everyone's help in all of this...

Phil

(in reply to Harry Lagman)
       Post #: 6

RE: Saito FA-125 Prop for speed - 5/6/2008 3:26:13 PM   
blw



Posts: 4458
Joined: 3/15/2004
From: Auburn, AL, USA
Status: online 		At 2 gallons of fuel you engine is well broken in.

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       Post #: 7

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