RE: %Nitro/RPM Tests

RE: %Nitro/RPM Tests
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RE: %Nitro/RPM Tests - 3/9/2006 6:08:47 PM

TimC

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From: Lone Pine, CA, USA
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Here are the results of a four stroke test with a 70 Surpass turning a 13x6 MAS:
5% Nitro.............9150
10%....................9320
15%....................9390
20%....................9660
30%....................9870

< Message edited by TimC -- 3/9/2006 6:13:10 PM >

(in reply to Sport_Pilot)

Post #: 26

RE: %Nitro/RPM Tests - 3/9/2006 6:20:03 PM

Cyclic Hardover

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quote:

ORIGINAL: torque wrench

Cyclic, I think a lot of that stuff is like the stuff in the JC Whitney catalogue

Ya know, I don't know if you meant that to be funny, but it was!

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Post #: 27

RE: %Nitro/RPM Tests - 3/9/2006 6:27:42 PM

Spicoli

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From: TERRACE, BC,
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Britbrat,
Just my opinion but I definitely think the 30% is worth the extra money.There was a big improvement.It felt like I moved up an engine size.

quote:

ORIGINAL: britbrat

quote:

ORIGINAL: Spicoli

My Saito 91 puts out 10,000 rpm with 15% Coolpower and a 14x6 APC
and 10,500 with 30% Coolpower.

Which raises the question -- is it actually worth the extra cost?

(in reply to britbrat)

Post #: 28

RE: %Nitro/RPM Tests - 3/9/2006 6:56:41 PM

britbrat

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From: Deep River, ON, CANADA
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quote:

ORIGINAL: TimC

Here are the results of a four stroke test with a 70 Surpass turning a 13x6 MAS:
5% Nitro.............9150
10%....................9320
15%....................9390
20%....................9660
30%....................9870

That's quite revealing -- a big boost after 15%. The two strokes don't show that.

Thanks

(in reply to TimC)

Post #: 29

RE: %Nitro/RPM Tests - 3/9/2006 7:55:47 PM

STG

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From: New Richmond, WI, USA
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quote:

ORIGINAL: britbrat

quote:

ORIGINAL: TimC

Here are the results of a four stroke test with a 70 Surpass turning a 13x6 MAS:
5% Nitro.............9150
10%....................9320
15%....................9390
20%....................9660
30%....................9870

That's quite revealing -- a big boost after 15%. The two strokes don't show that.
Thanks

Yes, and from what I have herd in the past the OS's don't benefit from 30% like the SA and YS's do. This shows quite the opposite.

BTW, I have herd of people getting significant gains from the .91FX helli version on 30% in higher elevations.

< Message edited by STG -- 3/9/2006 7:57:31 PM >

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RE: %Nitro/RPM Tests - 3/9/2006 7:58:27 PM

Sport_Pilot

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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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Post #: 31

RE: %Nitro/RPM Tests - 3/9/2006 8:33:47 PM

STG

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quote:

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.

quote:

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.

< Message edited by STG -- 3/9/2006 8:35:58 PM >

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Post #: 32

RE: %Nitro/RPM Tests - 3/9/2006 8:35:58 PM

bla bla

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From: Oslo, NORWAY
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[/quote]

Yes, and from what I have herd in the past the OS's don't benefit from 30% like the SA and YS's do. This shows quite the opposite.

[/quote]

No it doesn't show the opposite it show what's been known for years. 4 stroke power (regardless of brand) benifits greatly from the addition of large quanities of nitro, 2 stroke don't.

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Post #: 33

RE: %Nitro/RPM Tests - 3/9/2006 8:38:39 PM

STG

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quote:

ORIGINAL: bla bla
No it doesn't show the opposite it show what's been known for years. 4 stroke power (regardless of brand) benifits greatly from the addition of large quanities of nitro, 2 stroke don't.

Well I have herd time and time again that the OS or Magnum does not show much improvement in power when going to 30%. You are saying that going to 30% with OS and Magnum will show significant power gains---- has been known for years?

< Message edited by STG -- 3/9/2006 8:41:14 PM >

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RE: %Nitro/RPM Tests - 3/9/2006 8:57:18 PM

Sport_Pilot

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quote:

ORIGINAL: STG

quote:

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.

quote:

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.

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

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RE: %Nitro/RPM Tests - 3/9/2006 9:01:57 PM

Sport_Pilot

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quote:

No it doesn't show the opposite it show what's been known for years. 4 stroke power (regardless of brand) benifits greatly from the addition of large quanities of nitro, 2 stroke don't.

Actually many two strokes do. It's not the number of strokes that matters but the compression ratio. Notice that I confirmed to Brit Brat that my old OS .91 Four Stroke did not show that much power gain. In fact it was rather doggy. That was a Surpass I but the newer Surpass II may very well show a good power boost. The older Saito's did not do well with nitro either.

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Post #: 36

RE: %Nitro/RPM Tests - 3/9/2006 9:08:24 PM

bla bla

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quote:

ORIGINAL: STG

quote:

ORIGINAL: bla bla
No it doesn't show the opposite it show what's been known for years. 4 stroke power (regardless of brand) benifits greatly from the addition of large quanities of nitro, 2 stroke don't.

Well I have herd time and time again that the OS or Magnum does not show much improvement in power when going to 30%. You are saying that going to 30% with OS and Magnum will show significant power gains---- has been known for years?

Yes.. as long as its a 4 stroke.
It depends what you class as significant... but the numbers have been reported above are similar to what a said on page one.
What has never been tested is the longivity of runing some of the cheapo 4 strokes on high nitro contents.
I have run an OS 1.20 surpass II on 25-30% for many many years and it's just wonderful. Simlar results with a tiny old fashion Enya .41 4 banger.
Don't know about the mechanical qualities of the cheap SC etc over time but they certainly come to life at the field when a give folks a tank of CP30 for them to try.
They are genuinely shocked by the increase over their normal 5-10% fuel.
It's worth noting the CP30heli has a very high oil content in comparision to other fuels... I believe this adds to the life span of many engines.

I think the reason some people don't see so much of a benifit when trying it on older engines is that the're engines are somewhat worn out!
They're just tierd. There are of course some engines... don't ask me which, that just wheren't designed for power.

< Message edited by bla bla -- 3/9/2006 9:15:14 PM >

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RE: %Nitro/RPM Tests - 3/9/2006 9:17:18 PM

Sport_Pilot

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Since those cheapies are as well made as the OS I suspect they will last just as long. Only thing OS has on them is better quality control of tolerances. Rods, pistons, etc seem just as strong.

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RE: %Nitro/RPM Tests - 3/9/2006 9:37:33 PM

bla bla

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quote:

ORIGINAL: Sport_Pilot

Since those cheapies are as well made as the OS I suspect they will last just as long. Only thing OS has on them is better quality control of tolerances. Rods, pistons, etc seem just as strong.

These things are important but so is what you're trying to achieve with all that extra nitro in your 4 stroke... more RPMs isn't what you're ultimatle searching for. A bigger prop is.
What people tend to forget is that folk generally over rev the average 4 stroke... they seem to be on some type of RPM hunting trip... he whos engine revs most is the winner. Nothing could be further from the truth. Lets say you get 8500rpm on 5% with say a 16x8 for example. You then put in 30% and go to 9500rpm with the same prop.... Woopee and of you go and fly.
Those higher revs aren't really doing your 4 stroke much good... infact amongst other thing you're reving out of the torque band! Instead what I would be doing is giving the engine and larger prop say..16x10/18x8 and getting the revs back to 8500. Max grunt at low revs swinging big props and low noise... that's the 4 stroke thing... but you need mucho nitro to get you there.
Of course exactly where that RPM sweet spot is tend be be different with engine size... smaller engines need to rev slight higher that larger engines. You just need to experiment.

< Message edited by bla bla -- 3/9/2006 9:42:09 PM >

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Post #: 39

RE: %Nitro/RPM Tests - 3/9/2006 9:42:23 PM

britbrat

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You point is well taken, but I don't that think anyone is necessarily advocating reving the snot out of the engine. For testing comparison purposes, the RPM thing is a good indicator of HP increase -- as long as the revs aren't falling off the power curve.

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Post #: 40

RE: %Nitro/RPM Tests - 3/9/2006 9:55:00 PM

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