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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Predator YS80 vs YS91
11-25-2006 10:06 PM  11 years agoPost 1
rcsoar4fun

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Boise, Idaho

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Has anyone swapped a 91 for an 80 in a predator? How much difference can I expect? I am running some Vblades 680s, the 80 just doesnt seem like enough power.

Kristopher

I give up on Loctite, nothing lasts long enough to vibrate loose anymore.

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11-26-2006 05:15 PM  11 years agoPost 2
coolice

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Northamptonshire, England

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Hey,

I wouldn't imagine there is much difference in the price of these two engines and so I'd say go for the 91 and be done with it. You'll soon grow into the power if your wary of a full blown 91 class heli.

Unless that is of course you have the 80 lying around already and are thinking of using it? If this is the case then you need to work out the correct gear ratio based on say a 1900 model head speed to the peak RPM of the engine.
.

Ian Contessa
Team Robbe SchluterUK
Midland Helicopters

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11-26-2006 05:40 PM  11 years agoPost 3
Buzzin Brian

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College Station, Texas

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The 80 was a great engine. It was a little thirsty, but made decent power. I had a couple of them, and I realy enjoyed their relyable service. I was running all of mine on 8:45 and it seamed to do just fine. Now all of my 90 size machines have the YS 91 in them, and I LOVE that engine. It just runs like a top, and has enough power for me. Yes there are more powerfull engines out there. But the YS engines seem to have about the most fiddle free service from tank to tank IMPO. But others results may vary from mine. I know I have no problem with the YS 80, but if I could get my hands on a 91 in its place I would do so in a heartbeat. But like was said, if you have a nice 80 laying around certainly give it a shot. I know I would.

Build it, fly it, crash it. Repeat as often as needed.

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11-26-2006 09:29 PM  11 years agoPost 4
AGRAV8

rrProfessor

Mosquito Coast......Houston Texas

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I had one
and the 80 was no slouch. yes, the 91 has more....but the 80 worked great back then. I had no troubles with it either.... 8:45 ratio.

That said, my Freestyle has the 8:36 and a 91 in it now...it pulls pretty well for 11.5 degrees....

GOOD guy list-39, BAD guy list-0

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11-26-2006 09:39 PM  11 years agoPost 5
DS 8717

rrProfessor

Here wishing i was somewhere else

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I have both engines and the 80 is great and has almost as much power as the 91. I think a lot of your problem is the V Blades,i used to use them but found out they are pretty draggy and cause the engine to bog. Try some better blades like the Radix 690 or 710 SB blades. They are quicker on cyclic and dont load the engine as much. Also try a higher headspeed the engine makes more power at 15500 to 16000 engine RPM.DOUG

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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11-26-2006 10:02 PM  11 years agoPost 6
Buzzin Brian

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College Station, Texas

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I to used V Blades for a long time. That is until I tried the Radix blades. And I LOVE those blades. They are crisp without as much loading, and they seem to groove a lot better IMPO. The SB's are a little to crisp at times. But man are they fun to fly with. Radix is about all I fly anymore. Actually the only heli I own that does not have Radix on it is my 30, and that is only because they do not make blades for 30's. Otherwise it would have Radix on it as well. Good stuff!

Build it, fly it, crash it. Repeat as often as needed.

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11-27-2006 01:36 AM  11 years agoPost 7
rcsoar4fun

rrKey Veteran

Boise, Idaho

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Thanks for the replies. I am running an 80 right now, and it it does seemed bogged by the blades. I picked up a good deal on the 91, which is why I was curious what to expect. As they say there is no substitute for cubic inches.

I give up on Loctite, nothing lasts long enough to vibrate loose anymore.

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