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HelicopterEngines Plugs Mufflers Fuel › YS .91 and Curtis Muscle Pipe.
12-01-2005 01:14 AM  12 years agoPost 1
jkru

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Seattle, WA

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Could someone comment on what experience they have had with this combination? Is it recommended?

JKru

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12-01-2005 02:42 AM  12 years agoPost 2
dgshaffer

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New Jersey

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I fly that combination in my Freya. It seems to perform well for me.

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12-01-2005 03:14 AM  12 years agoPost 3
LS1Heli

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Darien, Illinois

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I flew a YS .91 with the MP II in my Raptor 90 with a 8.27GR. It performed well, was no quieter or louder then my current Hatori SB-16FH and had a quality finish. Not a bad piece for $105US but I got rid of it because I prefer Hatori.

Raptor 90SE

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12-01-2005 03:45 AM  12 years agoPost 4
RobRoy

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Huntsville, Alabama

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Wa11banger here on RR has that combo on one of his raptor 90's, seems to put out more power than my YS91 with SB16. Not alot, but noticable.

.

Ignorance is curable, stupidity is for life.

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12-01-2005 05:49 AM  12 years agoPost 5
nocontrol

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Cape Town, South Africa

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YS on 8.45 gear ratio with MP2 and SB16 - our feeling is the MP2 have more power, it works well.

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12-01-2005 11:15 AM  12 years agoPost 6
Nasscar][

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Delaware

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I run this combo on my X-Specs at 8.45 with no problem.

Nas,

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12-01-2005 11:48 AM  12 years agoPost 7
davehour

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Guayama, Puerto Rico 00785

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Hmmm, interesting information. I was thinking the SB16 worked better than the MP2 in the YS.

Thanks guys and keep the opinions comming.

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12-01-2005 06:34 PM  12 years agoPost 8
LS1Heli

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Darien, Illinois

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It does.

Raptor 90SE

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12-01-2005 06:40 PM  12 years agoPost 9
RobRoy

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Huntsville, Alabama

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I think the Hatori works better across the spectrum, but the MP2 has better peak power.

Ignorance is curable, stupidity is for life.

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12-01-2005 07:22 PM  12 years agoPost 10
Wa11banger

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Huntsville, Al

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I have run both.. The Hatori's give a much broader spectrum, being you can be out of tune some or heavy handed on the collective and still produce great power, plus IMO the sound is better.

Now for my configurations I run YS91 ST4 with MP2's on 8.27:1 gearing and HS of 1850rpm in my Rappies.. This combination produces (for me anyway) the best maximum HP.. The problem is the MP2 has a much narrower (is that a word?) power band, meaning tuning and collective management are more critical. But for my experience power is at a premium with the MP2 combo. Now everyone has a different experience but all of mine are producing mad power in this configuration.. I produced a bit more grunt at 8.45:1 but I was running the engine on the ragged edge with wanting to run the HS at 1850rpm

Just my .02
Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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12-01-2005 07:29 PM  12 years agoPost 11
jkru

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Seattle, WA

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This is great info guy's keep it coming..

Thanks Everyone!

JKru

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12-01-2005 11:49 PM  12 years agoPost 12
Tom DeWinter

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Quad Cities, IL

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Rick,

Doing the math:

1850 * 8.27 = 15300

1850 * 8.45 = 15633

Does this 2% (333) increase in rpm really have a noticable effect?

Regards,

Tom

Quad Cities RC Whirlybirds -- FunFly July 12 & 13, 2008 Davenport IA
Plan Now to Attend!!!

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12-02-2005 03:10 AM  12 years agoPost 13
LS1Heli

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Darien, Illinois

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This is interesting. So what RPM does the YS 91 make maximum power? What RPM is dangerous and risks damaging the engine?

The fastest RPM I spin my 710s is 1800. Seems pretty fast to me. Generally I fly around at 1700 to 1750.

I run a 8.45GR so spinning at 1800 is 1800 X 8.45 = 15210

I know some of these guys are running 2100RPMs..thats too fast.

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12-02-2005 03:26 AM  12 years agoPost 14
airdodger

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Johnston USA

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12-02-2005 03:51 AM  12 years agoPost 15
Tom DeWinter

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Quad Cities, IL

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Does anyone have the torque/horsepower vs rpm curve for the YS91?

Thanks,
Tom

Quad Cities RC Whirlybirds -- FunFly July 12 & 13, 2008 Davenport IA
Plan Now to Attend!!!

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12-02-2005 03:55 AM  12 years agoPost 16
Wa11banger

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Huntsville, Al

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Tom,
Not really if you are good enough to keep the disk constantly loaded, but in the event you relax your flight any and unload the disk abruptly it makes a big difference.. I have now switched to MA RevMax governors and it would probably not be an issue any more.. but yes 300rpm was a difference and noticeably audible.

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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12-02-2005 04:05 AM  12 years agoPost 17
Wa11banger

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Huntsville, Al

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After talking to YS about MAX RPM the manual says 15k MAX but the guys at YS Performance say 17K. I make every attempt to not pass 16k unloaded.. I do not have any evidence other than the performance of the aircraft and "feel". All of my YS big blocks seem to respond to "need" and produce almost unboggable power just a tad over 15k with a MP2.. The only reason I leave any overhead RPM is the 17k value given is a NTE (not to exceed) and most engines do not produce their maximum power at that range but mildly lower.. No math assisted me just tuning, time, experience, and fiddling with gear ratios.

Like I said earlier the hatori has a much broader range roughly producing good power anywhere from 14.5-15.5 k whereas the MP2 is around 15- 15.5k and in this range on the MP2 the power is phenominal.

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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12-02-2005 05:20 AM  12 years agoPost 18
LS1Heli

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Darien, Illinois

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Well then I think 1800 should be my max. I am not going to risk a hard to find power plant for a coupler extra Rs.

Tom: Thanks for showing that calcuation. I learned something.

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12-02-2005 05:50 AM  12 years agoPost 19
Wa11banger

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Huntsville, Al

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1800 is very respectable and nothing wrong with running it there. The only reason I run 1850 regularly is the RevMax. Without it I was always worried about the overspeeds when unloading.

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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HelicopterEngines Plugs Mufflers Fuel › YS .91 and Curtis Muscle Pipe.
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