Saito 1.50 prop size?  
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Saito 1.50 prop size? - 3/11/2002 7:22:22 AM   
CaptainHook



Posts: 1103
Joined: 12/24/2001
From: Swartz Creek, MI, USA
Status: offline 		I am getting ready for summer and have a Saito 1.50 mounted in the T-craft. I would like to go with an APC 16 x 10. What would you suggest for break in and performance? BTW, what fuel?
       Post #: 1

Happy RPM? - 3/11/2002 7:54:59 AM   
MrMike



Posts: 983
Joined: 12/23/2001
From: Pine Creek - 6800MSL, CO, USA
Status: offline 		I need some answers too and will listen in to any replies What RPM is the 150 happiest at? I fly my models at 6800MSL and I'm gonna run the 30% helo fuel that Horizon suggests.

Mike

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Saito 1.5 fuel - 3/11/2002 9:11:17 AM   
Charley


 

Posts: 1000
Joined: 12/5/2001
From: Kerrville, TX, USA
Status: offline 		I've been flying a Saito 1.5 in an Ace 4-120 bipe for ~4 years. Mine was purchased when the 1.5 was fairly new on the market. I've heard that the later version II has a bit lower compression and is more tolerant. The instructions said to use 5 - 15% nitro and at least 18% oil. Also said to use some castor oil in the mix. Accordingly, I tried the Red Max 15% 4-stroke fuel that I had been using in my smaller 4-strokes when I lived and flew at 4000 feet msl. The thing kicked back and threw props. I put a C&H ignition on it and a compression-lowering shim under the jug. It ran beautifully on that setup for several years.

Recently, I ran it on a 16:1 mixture of 95 octane gas and Klotz. Ran good on that but the power was down. So as an experiment, I went to 10% 2-stroke glow fuel without the shim. Ran well, more power than the gas. As a further experiment I took off the ignition and ran it on the same fuel but as a glow engine. Runs well, turns an APC 16x8 ~8700 rpm. Idles good revs right up. Maybe it's just now broken in. Go figure.....

Don't the instructions that came with your engines tell you what fuel and prop to use for break in?

Cheers,

CR

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Charley
ccrobins@ktc.com

(in reply to CaptainHook)
       Post #: 3

Saito 1.50 prop size? - 3/11/2002 10:18:14 AM   
Rarebear


 

Posts: 58
Joined: 2/17/2002
From: Lansing,Ks.
Status: offline 		Chook, I have a Saito 150 in a 1/4 scale lazer using a APC 16X8 and it pulls it around with ease.

(in reply to CaptainHook)
       Post #: 4

Saito 1.50 prop size? - 3/11/2002 10:23:01 AM   
MrMike



Posts: 983
Joined: 12/23/2001
From: Pine Creek - 6800MSL, CO, USA
Status: offline 		Don't wanna highjack Chook's thread here ... Mine was bought slightly used. I just slapped a 16x8 APC on it with a new OS "F" plug and flew it with 10% ducted fan fuel (w/18% synthetic oil). It seems happy a clam; I've never tach'd it, only needled it for good "smoke" and go fly. That was several hundred flights ago in my (plans-built) UltraSport1000 which I just recently retired after nearly a 1,000 flights. [;}
Independent of what the instructions say (I don't have a copy of them), I was just wondering what RPM it's *supposed* to be happy at.

Mike

_____________________________

How''s my flying? Call 1-888-BITEMY6
Hooligan AF/CC

(in reply to CaptainHook)
       Post #: 5

Saito 1.50 prop size? - 3/11/2002 10:18:08 PM   
LuvBipes



Posts: 1073
Joined: 12/29/2001
From: Luxembourg City, LUXEMBOURG
Status: offline 		My saito 150 runs well at a slightly rich 8700 rpm w/ an APC 16X8 and 15% nitro Wildcat fuel.

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(in reply to CaptainHook)
       Post #: 6

Saito 1.50 prop size? - 3/12/2002 1:16:03 AM   
RCJones



Posts: 434
Joined: 1/6/2002
From: Durham, NC, USA
Status: offline 		Saito 150
16x8 apc
Cool power 15%
Goldberg ultimate bipe


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If at first you don't succeed...buy,buy again!

(in reply to CaptainHook)
       Post #: 7

Saito 1.50 prop size? - 3/12/2002 7:06:37 AM   
CaptainHook



Posts: 1103
Joined: 12/24/2001
From: Swartz Creek, MI, USA
Status: offline 		I have used the cool power 15% with great success on other engines, I will have to give it a try on this one. 16 x 8 works also, although I would like to keep the rpm's down a little. Thanks Guys! MrMike, your not hi-jacking my thread, it belongs to all here.

Carey

(in reply to CaptainHook)
       Post #: 8

Saito150 Manual - 3/12/2002 8:13:33 AM   
MrMike



Posts: 983
Joined: 12/23/2001
From: Pine Creek - 6800MSL, CO, USA
Status: offline 		Being still curious about this "happy RPM" thing, I cheated and found an archived copy of the 150 manual on the Horizon web site. Figure 5 therein shows an RPM range from 2000 to 10,500 for the 150. Among 3 different categories (Sport, Scale, & Aerobatics) there is an amazing range of props: from a 14 x 14 all the way up to an 18 x 8!
I know on a 4 cycle engine max torque typically occurs at a lower RPM than maximum horsepower. From what I'm reading here in this thread I'm thinking I can infer the greatest amount of torque is around 8K. But then there's the other variable of nitro percentage and that kicks in the glow plug heat range question!! I think I'll just continue with my 16 x 8 APC and maybe slip on a 17 x 8 just for grins.

Mike

_____________________________

How''s my flying? Call 1-888-BITEMY6
Hooligan AF/CC

(in reply to CaptainHook)
       Post #: 9

Prop selaction - 3/13/2002 4:23:53 PM   
Charley


 

Posts: 1000
Joined: 12/5/2001
From: Kerrville, TX, USA
Status: offline 		It all depends on what you want out of the plane and the type of plane. My bipe has lots of drag doesn't fly very fast, so the prop doesn't unload much in the air except on a downline, where I throttle back anyway. I could go to a 17x6 without much fear of over-revving it and possibly gain better vertical performance thru greater thrust. If your airplane has less drag and/or needs to fly faster to perform well, a smaller disk and more pitch may be the answer. In any event, revving it much over the horsepower peak isn't any use and increase the wear and tear on the engine.

Cheers,

CR

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Charley
ccrobins@ktc.com

(in reply to CaptainHook)
       Post #: 10

Saito 1.50 prop size? - 3/14/2002 7:49:40 PM   
Barry-RCU



Posts: 170
Joined: 2/4/2002
From: Central, NJ, USA
Status: offline 		Saito 150
16-8
15% S&W Fuel
Was on Edge now on Goldberg Ultimate

(in reply to CaptainHook)
       Post #: 11

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