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HelicopterMain Discussion › .50 Engines
09-03-2003 04:04 AM  14 years agoPost 1
TerranAce007

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Austin, TX

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I just sent my troublesome TT .50 back to Ace for the second time so I can hopefully get them to replace it or refund it. At first I was going to get an OS .50, but then I heard of the West Eurotech .50. Their website claims that it reaches 2.8bhp on 5-15% nitro fuel, which is a lot of power. I wanted to compare this with the OS and TT .50's, but I am finding different measurments.

The OS .50 is rated at 1.8ps/17000rpm according to their site, and I would guess that the TT is close.

The West Eurotech is rated at 2.8bhp/21300rmp with a Weston pipe.

Does bhp mean British Horsepower? What does the ps stand for, and how do these convert into eachother so I can get a better comparison?

I read that the WE .50 costs upwards of $300 with the exhaust included. In the review , the guy said he had to keep his throttle under 70% and the thing still screamed.

One thing I don't get though: If this thing has the power they say it does, is it worth the money since I won't be able to run it at full power without overreving?

If I can spend less and get an OS .50 running at full power, am I missing out on something?

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09-03-2003 05:07 AM  14 years agoPost 2
KC

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WA

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09-04-2003 02:05 PM  14 years agoPost 3
TerranAce007

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Austin, TX

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Well I want to know about quality and relaiability before I spend that much on a .50 size engine.

I've heard many good things about OS, and my TT was a P.O.S.

I'm not a very good pilot yet, so I won't be able to use that extra power for anything else than hitting the ground faster, at least until I actually get some flying time in to learn some 3D.

Im thinking the OS .50 will be plenty of power because I've seen videos of those things in action, and I won't have to limit my throttle to 70% because I can't afford a governer...

Anyway, how does one convert bhp to ps?

What is the bhp rating on the OS .50?

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09-04-2003 02:27 PM  14 years agoPost 4
Doug

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Port Saint Luice Florida....

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1 HP = 750 Watts

PS This unit (German: Pferdestärke = horse strength) is still commonly used in Germany and central Europe, although not an lawful unit any more. It is defined by the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig as: 1 PS = 735.49875 W
So I PS = .980665 HP
BHP refers to the method of measurement where a brake or load is used to hold the engine at a specific RPM and the torque on that brake is measured T X RPM /33000 = BHP. As there are losses involved BHP will have a "measuring" correction. Aircraft engines (large Recips and Turbo shafts) can measure the thrust on reduction gears and calculate shaft HP directly with no measuring loss. As to your comparison, it is akin to the 50CC motorcycle engine that produces 40 BHP at 25,000 RPM but unfortunately it will only turn 12,000. those number are useless in a heli.
More Trivia

First member of Member of Bearings Anonymous

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09-04-2003 04:01 PM  14 years agoPost 5
Reesy

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In the doghouse ... Nottingham UK

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I've got a West eurotech 50H I suspect 2.8 bhp is unrealistic but a recent reviewer (Austrian) got close to 2.4

I'm currently running in a new piston and liner combo .. modified port timing so can't give a definitive final answer yet

But as Mr Rolls and Mr Royce, when questioned about the BHP of their latest charabanc simply answered ... "adequate"

Paul

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09-04-2003 04:40 PM  14 years agoPost 6
Ben-T-Spindle

rrProfessor

Central Illinois

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It’s relatively easy to make lots of power but it’s much harder to get a good smooth running engine. The carb and porting is what makes it smooth all the way from a low speed hover to maximum rpm.

Higher power usually comes at higher engine rpm that requires custom gearing.

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09-05-2003 04:56 AM  14 years agoPost 7
Airman98

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Southern Illinois

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Get a OS50 you will love the power and reliability.

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09-05-2003 05:01 AM  14 years agoPost 8
Fisherman

rrApprentice

Hong Kong

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I think OS50 is good, but it is too thirsty.

TT50 -- We feel the performance is petty good. But the relibility is not very good.

Webra 50 is a good machine, but you need "SKILL".

Which engine is good is subject to what you are request?

So I think it can hardly to make a judgement to say which is good or not.

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09-05-2003 05:11 AM  14 years agoPost 9
Spencer K

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Phoenix, Az

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just buy a header tank for the os 50 and love every flight

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