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ORIGINAL: STG

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ORIGINAL: Sport_Pilot

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ORIGINAL: STG

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ORIGINAL: Sport_Pilot

Similer to my old OS .91 FS. Put a 14-6 on it and you could keep pumping the nitro up to about 25% or so and get small incremental gains like that, but never go over 10,000 RPM.

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15%....................9390
20%....................9660
30%....................9870

500 rpm from 15% to 30% on a 13x6 is not small incremental gain--it is a significant power boost.

Actually the jump between of over 200 RPM is small. The total gain is less than 500 RPM but not small. My old OS .91 showed less gain than that, actually a dog compared to a Saito, TT, or even Magnum .91. Maybe the Surpass II keeps up with those, but not the original Surpass. I was also responding to another post that OS did not do as well on nitro.

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So? It's not the same engine is it?

When you said "small incremental gains like that" I took it to mean that you were gaining a similar power boost between 15% and 25%. 500rpm in the 9500rpm range is a significant power boost with a 13x6 or 14x6 prop.

I have herd time and time again and looking at Dars post here it is again....

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YS are for 20-30%, Saito are for 15-25%, Jett are for 15%, OS and clones are for 5-15%...

That OS and magnum do not benifit much in power gain by jumping to 30% nitro. The test with the OS70 shows a large benifit from 15% to 30%

Bla Bla claims

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Yes.. as long as its a 4 stroke.. it shows what's been known for years. 4 stroke power (regardless of brand) benifits greatly from the addition of large quanities of nitro

This was new news to me. Always learning something new.

That statement is only true of today's popular four stroke engines. Older four stroke engines and some less popular engines (Laser's come to mind) that are designed for low or FAI fuel will not respond to an increase in nitro.


< Message edited by Sport_Pilot -- 3/10/2006 2:47:08 PM >

_____________________________

“I Saw Elvis at 1000 Feet” John Force

(in reply to STG)

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ORIGINAL: Sport_Pilot

I have herd time and time again and looking at Dars post here it is again....

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YS are for 20-30%, Saito are for 15-25%, Jett are for 15%, OS and clones are for 5-15%...

That OS and magnum do not benifit much in power gain by jumping to 30% nitro. The test with the OS70 shows a large benifit from 15% to 30%

Bla Bla claims

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Yes.. as long as its a 4 stroke.. it shows what's been known for years. 4 stroke power (regardless of brand) benifits greatly from the addition of large quanities of nitro

This was new news to me. Always learning something new.

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That statement is only true of today's popular four stroke engines. Older four stroke engines and some less popular engines (Laser's come to mind) that are designed for low or FAI fuel will not respond to an increase in nitro.

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ORIGINAL: Sport_Pilot
When you are trying to max out the power with nitro, you are usually looking at max revs. Sometimes you can get better performance with a larger prop, but as often as not you are on the verge of detonation with the larger prop and you will get better performance from the smaller prop. Note I said performance, not efficiency. As for as reving the four stroke engine, I think you are stuck in the early 80's. Todays four stroke engines perform poorly in the 8,000 RPM range and do better in the 9,000 and 10,000 RPM range. The max RPM on most of them have been raised from 10,000 to as high as 13,000. There is a SIG out west that race nothing but four strokes, YS I think. I believe they run over 12,000 and maybe 13,000 or so.

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ORIGINAL: Sport_Pilot

Yes, but it was bla bla I was responding to. He also said that two strokes do not respond to an increase in nitro.

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ORIGINAL: bla bla

STG.. stop toshing off.
You always seem to be terribly concerned about what people say.
You should experiment for yourself... draw your own conclusions, make your own opinions instead of listening, debating and analysing others.
Become an opinion maker, instead of an opinion spreader.
People, myself included make comments in the best possible faith, based on our own person experiences and yes, they tend to be generalizations. These may or my not agree with what you've "heard". Theres a chance that you and others may experience them as correct and there's a chance that you wont. This is something you'll never know untill you've done it for yourself and for others... not once or twice next time your at the feild this weekend... but over years.
I first started flying RC aeroplane in the mid 70's and the only thing that surprizes me today is that there are constantly many surprizes!
As in life sometimes things work when they're least expected and of course vis verse... What sould be correct wasn't and what appeared to be wrong... worked perfectly.
There IS no right or wrong... it's what works best for you in the perticular circumstance.
Stop Anal-ising.

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Stop Anal-ising

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ORIGINAL: Sport_Pilot

The max RPM on most of them have been raised from 10,000 to as high as 13,000. There is a SIG out west that race nothing but four strokes, YS I think. I believe they run over 12,000 and maybe 13,000 or so.

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ORIGINAL: DarZeelon
But as the 'engine expert' where I fly, I have more playing experience with four-strokes and with their fuels, than many of the respective owners/'throttle pushers' of these same engines. I also learn better than most, from what I do.