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HomeAircraftHelicopterAntiques or Out of Business › OS 28F heli engine
06-05-2009 01:36 AM  9 years agoPost 1
Helizrule

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Lake Ariel, PA

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I have a question.... I bought a "new" OS 28 on e-bay for one of my GMP Cricket helis. It looks new, starts and runs strong on my test stand but when you turn it over by hand it has no compression. All my OS 25FSR engines have strong compression. I noticed the 28 does not seem to have a ring and I don't think it is an ABC engine. Does anyone have this engine to compare? Thanks.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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06-05-2009 01:53 AM  9 years agoPost 2
rocket_33

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Mount Pleasant, Michigan USA

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I used to have one and I recall it was a ringed engine with a Dykes ring (had to replace it a couple of times). I can't imagine it running well if it didn't have a ring and also can't imagine you would not notice the ring land in the piston w/o the ring there.

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06-05-2009 02:44 AM  9 years agoPost 3
Helizrule

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Lake Ariel, PA

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I did a google search and found they made a ring and ABC version of this engine. I have the ABC version.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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06-05-2009 02:39 PM  9 years agoPost 4
rocket_33

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Mount Pleasant, Michigan USA

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Right on....sounds good so you are ready to fly

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06-07-2009 03:06 AM  9 years agoPost 5
reddragon

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Brooklyn, N.Y.

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It looks new, starts and runs strong on my test stand but when you turn it over by hand it has no compression.
Isn't the ABC version "harder" to turn over than the ringed version?

At least this has been my experience.

Wayne - Fly it like you stole it! You're in good hands with Runryder!

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06-07-2009 02:48 PM  9 years agoPost 6
GMPheli

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W. Bridgewater, MA USA

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Yes an ABN engine should have very good compression. What you say makes no sense. If it has no compression then it should not run

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06-07-2009 04:07 PM  9 years agoPost 7
R-Moore74

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norway

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I have several 28F engines and they all have good compression...strange...But I remember my uncle once had a 25FSR with almost no compression and it ran very well anyway...

Bent Are

BEntHeli
Who says it can't fly? - Just watch and I'll make it!!

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