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Bell 212 D-HOPP
Finally got round to flying D-HOPP instead of just looking at it. It is fitted with an orginal HB61 and it took me two hours of adjustments to get it to fly. The engine starts with just a flick from the starter but after about 30 seconds seems to flood so unless I can get it run up to speed by then it just stalls. It also runs through a very rich quarter stick setting before finally getting up to hover revs. I have it set slightly four stroking at this point as trying to lean it off any more causes it to get hot in the hover.
I know the HB61 is sensitive especially with the type of carb fitted but this is a bit of an anoyance. It is gravity fed and I was considering changing it to an exhaust pressure system which tends to even out the fuel flow. Anybody tried this or any mod to the carb or even fitting a later model carb. I intend to keep the original engine but would like a little more confidence in its running......
By the way, it flies perfectly and apart from a 'soggy' collective response it can be thrown around (upright of course) very well. I was suprised how controllable it was and how stable given that the weather conditions were not too good with variable and gusty winds that bounced about my T-rex. I also managed nose in with a rate gyro side on to the wind so I was impressed with it.
It also goes to show that it wasn't the helicopters that were difficult to fly when I was younger; it was me being crap at it.................
Joe
PS no I havn't tried it without a gyro yet as I need to get a bit more confidence in the engine; also I will get video if I can find someone to do it when I next go flying......
Finally got round to flying D-HOPP instead of just looking at it. It is fitted with an orginal HB61 and it took me two hours of adjustments to get it to fly. The engine starts with just a flick from the starter but after about 30 seconds seems to flood so unless I can get it run up to speed by then it just stalls. It also runs through a very rich quarter stick setting before finally getting up to hover revs. I have it set slightly four stroking at this point as trying to lean it off any more causes it to get hot in the hover.
I know the HB61 is sensitive especially with the type of carb fitted but this is a bit of an anoyance. It is gravity fed and I was considering changing it to an exhaust pressure system which tends to even out the fuel flow. Anybody tried this or any mod to the carb or even fitting a later model carb. I intend to keep the original engine but would like a little more confidence in its running......
By the way, it flies perfectly and apart from a 'soggy' collective response it can be thrown around (upright of course) very well. I was suprised how controllable it was and how stable given that the weather conditions were not too good with variable and gusty winds that bounced about my T-rex. I also managed nose in with a rate gyro side on to the wind so I was impressed with it.
It also goes to show that it wasn't the helicopters that were difficult to fly when I was younger; it was me being crap at it.................
Joe
PS no I havn't tried it without a gyro yet as I need to get a bit more confidence in the engine; also I will get video if I can find someone to do it when I next go flying......
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