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HomeAircraftHelicopterMain Discussion › Where have all the 4 strokes gone?
11-02-2004 06:18 PM  13 years agoPost 1
Chopper

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Stow,Oh- oops, I mean St Louis, nope Stow again,

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Hello all.

I was trying to locate some of the 120 four stroke heli engines that YS sold a few years back. Richard seems to think there may be some in parts at the YS factory. ( I doubt it)
Does anyone have two or three of these sitting around in the basement?

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11-02-2004 06:50 PM  13 years agoPost 2
Roamer

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Albuquerque, NM

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I do not know, but if I had to guess, I would say:

1) Low power
2) High weight
3) More vibration

They had good torque though...

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11-02-2004 07:06 PM  13 years agoPost 3
Agilefalcon

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Fort Worth, Texas

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I don't know about the low power. A fellow here in Dallas did a lot of testing on the YS power X-Cell machines. He worked closely with the YS importer and MA.

If I remember rightly, the biggest problem was rpm control. The motor just wouldn't stay together when unloaded and so it demanded extra maintainence. He had tons of power though and it didn't seem like the motor weight made much of a difference to anything.

This all took place in the 1996-97 time frame. The guys name was John Rader.

Chris Berardi
Team BobbyJack's Hobbies

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11-02-2004 09:13 PM  13 years agoPost 4
GM1

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Tallahassee, Florida US

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4 Stroke
I think JR had a 4 stroke model released only in Japan, (the Quatro?) that used a 120. At least I never saw one here so I assume it was never released in the US.
One of the major problems with the 4 stroke was rpm control. We were operating right at the top of the useful rpm range and if the model was unloaded quickly, the motor would over-rev and break parts. I used a GV-1 on mine with a 7.5 gear and it was the smoothest, quietest model I ever had but I could never keep the YS 91 ACH together for any long period of time. I have a YS FZ91 that has been bullet proof in a pattern model but it is metered wrong for a helicopter. I don't think the FZ110 has enough balls to match the 2 stroke 91s so you would need to look elsewhere. Who else makes a 20cc four stroke?
Gordie.

On a dog sled team, if you're not the lead dog, the view never changes.

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11-03-2004 03:49 AM  13 years agoPost 5
Flight-ready

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Bristol, TN

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O.S. is still making the FS-52H Surpass heli motor, sold here in the U.S. There just doesnt seem to be a high enough demand.

Flight-ready

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11-03-2004 04:23 AM  13 years agoPost 6
reefguy

rrApprentice

palmdale california

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four stroke
i still have my tsk mystar with a ys91ach four, it has sat more than it has flown not like my other helis...

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11-03-2004 09:29 AM  13 years agoPost 7
smudge

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Wiltshire, UK

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Henseleit rocket
Was the Henseleit Rocket designed around a 120 four stroke engine?

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11-03-2004 10:48 AM  13 years agoPost 8
GM1

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Tallahassee, Florida US

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Hmmmm.........
As I recall, the Rocket was designed around a 140 which is not legal for FAI but a very interesting design.
Gordie

On a dog sled team, if you're not the lead dog, the view never changes.

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11-03-2004 10:49 AM  13 years agoPost 9
daren

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Hampshire Sponsored by Quick UK

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Was the Henseleit Rocket designed around a 120 four stroke engine?
It was designed around the 140 two stroke,

Daren
Using the ground to reverse engineer

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11-03-2004 01:32 PM  13 years agoPost 10
Chopper

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Stow,Oh- oops, I mean St Louis, nope Stow again,

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The YS 110 has a bit more power than the 91, which was OK at the time. With a couple of years of running the 91 two cycle, I don't think I could ever go back to the 91 four cycle power. I'm looking at the YS 120 and I want to gear it at 6.42. My thinking is that there are a ton of YS 120 four stroke engine out there that the plankers ran before the 140. I'll work on the metering.

I don't belive the OS 120 has anywhere near the power of the YS 120 so I never really concidered it. If I can't do the YS 120, I will think about the YS140, just do the XFC, and forget FAI. I gotta see how the whole thing pans out. Or maybe I'll do like Jason and get a Raptor 50 and wait for the Synergy.

I would like to do a four stroke project for next year. 120 or 140. Anybody have parts?

Paul

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11-03-2004 01:48 PM  13 years agoPost 11
Doug

rrElite Veteran

Port Saint Luice Florida....

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What is really needed is a high performance 4 stroke. (remember a two stroke is slightly more than half as efficient as a four stroke twice as often.

Here's what is needed:
1 CI displacement opposed twin. With double overhead cams and three or four valves per cylinder. Small balance shafts to cancel out the rocking couple (180 deg firing order). Peak torque at 75,000 RPM and Peak HP at 100,000 RPM Running on gas.

5-6 HP and weigh 2 LB

The couple this using a Super conducting three phase generator. Into a Power converter driving a synchronous super conducting AC motor (direct drive to the rotor no gearing required). Using the current HTS wire and a small dewar of liquid nitrogen (the size of a CO2 cartridge) to cool the rotating fields. total conversion efficiency more than 95% The engine runs at whatever RPM is required to provide for current power needs.

First member of Member of Bearings Anonymous

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11-03-2004 02:05 PM  13 years agoPost 12
Chopper

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Stow,Oh- oops, I mean St Louis, nope Stow again,

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Uh... yeah Doug. Maybe....next year.

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