2 Seater Twin Engined Helicopter!!!
Thread Starter
2 Seater Twin Engined Helicopter!!!
Hi all, just seen this in Barnstormers and NO living in Glasgow Scotland I have nothing to do with the sale or the company. Does anyone know anything about this, looks....interesting!!!
BARNSTORMERS.COM
BARNSTORMERS.COM
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stress
I was feeling stress watching that video. The sound, the jerkiness of the controls, the pedal turn on the ground, the pilots hat, the toilet paper hanging off the skid. It looks like it needs some work. The sleek lines of the thing look fine to me. I will wait for the E or F model before taking one round the patch.
Cheers
Cheers
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Seeing the thread title, I thought - 'What's the deal?'
Reading it and seeing the vid,
You guys sure it's two strokes? Surely they're not serious?
What about one engine inop performance? Else no point complicating things.
Pistons vs turbines, power to weight ratio, hmmm.
Reading it and seeing the vid,
You guys sure it's two strokes? Surely they're not serious?
What about one engine inop performance? Else no point complicating things.
Pistons vs turbines, power to weight ratio, hmmm.
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If the specs are accurate, it seems Robinson would have some serious competition. 1,710ft/min climb / cruise 110mph / continued flight on one engine/ 340 mile range / 222 per passenger (with full fuel) / all for 149,000 new?
Thats pretty beast
Thats pretty beast
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ROFL COPTER is not the only joke helicopter!
If the specs are accurate, it seems Robinson would have some serious competition. 1,710ft/min climb / cruise 110mph / continued flight on one engine/ 340 mile range / 222 per passenger (with full fuel) / all for 149,000 new?
Thats pretty beast
Thats pretty beast
Quick google check, and found an engine that fits the description, Canadian, no less. Zanzottera MZ 301 - Wikipedia, the free encyclopedia
An R22 stays in the air with a lot less than 90 hp once at cruise, so certainly doable. Think of it as a shrunk BO-105.
Part of the poor handling could have been because everyone was cold from standing around. Track and balance looked off to - lateral and vertical, blades not in plane. Problem with a two-stroke is that the hp is related to the rpm and is peaky, but that a rotor system doesn't like that great a variation. Assuming 90 hp at 6250 rpm would be the top of the green, those engines are going to be run fast and hard. Nothing that lowering the TBO (overhaul on a two-stroke will be cheap) can't fix. Russian, so you know it's built to last. I like it.
An R22 stays in the air with a lot less than 90 hp once at cruise, so certainly doable. Think of it as a shrunk BO-105.
Part of the poor handling could have been because everyone was cold from standing around. Track and balance looked off to - lateral and vertical, blades not in plane. Problem with a two-stroke is that the hp is related to the rpm and is peaky, but that a rotor system doesn't like that great a variation. Assuming 90 hp at 6250 rpm would be the top of the green, those engines are going to be run fast and hard. Nothing that lowering the TBO (overhaul on a two-stroke will be cheap) can't fix. Russian, so you know it's built to last. I like it.
Skyline
Engine Hirth H37-Е performance Characteristic value Type Three-cylinder two-stroke Volume 939 cm3 Stroke 69 mm Cylinder diameter 76 mm Power 90.6 hp at 5200 rpm Torque 123 Nm at 5000 rpm Formation of a mixture Injector The ignition system Controlled by computer Generator power 250 W, 12 V Cooling Water Weight 45 kg Starter Electric starter The direction of rotation Counterclockwise in the form of the output shaft Lubrication system Automatic Oil Oil for two stroke engine motor Fuel Petrol A95 or higher
Dang, beat by the Germans again. I guess the Canadians can go back to chopping down trees and growing wheat. Hirth engine has auto-oiling - no oil/gas premix, 90 hp at 5200rpm instead of 6250, water-cooled instead of fan, lighter weight...where was this thing when all the BD-5's were trying to fly.
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Twitchy because the tail rotor boom is too short. This, in conjunction with a rather small TR diameter will rob more power than would be the case with a longer boom. And be susceptible to LTO as you eventually run out of that power.
Main rotor diameter also looks too small.
But A for effort and a pretty nice looking design.
Main rotor diameter also looks too small.
But A for effort and a pretty nice looking design.
Thread Starter
Yip a definite A for effort and looks. I'm sure with more time on type the demo would have a looked a great deal smoother. It will be interesting to watch the progress and see how the figures work out in real life. I know we all have horror stories around 2 srtoke engines, I remember my plugs oiling up on my old Yamaha 250 cc motorcycle but I do believe they are so much better these days and the fact that there are 2 of them. Whats the bets this will make it or end up as a one off???
My experience with two-stroke motors is the outboards on the boats around here. Many are 40 years old and still doing fine. Somali pirates bet their lives on them every day hundreds of miles offshore dodging snipers. Maybe the constant rpm and water-cooling? Don't see the problem using them in a helicopter, just Luddite attitudes to contend with.
