C-FXFX Posted January 22, 2007 Report Share Posted January 22, 2007 Just wonder if we can startup s-76 with the rotor stopped,why we can not be able to do the same with a Jranger a L or 222 or a 412? Humm can't remember why! GUY Quote Link to comment Share on other sites More sharing options...
Reddog Posted January 22, 2007 Report Share Posted January 22, 2007 Probably because your engineeroid isn't strong enough to hold the blades with an engine at idle. Quote Link to comment Share on other sites More sharing options...
Dan Posted January 22, 2007 Report Share Posted January 22, 2007 That's a good question. I would like to hear a good answer too. I've seen a 212 started with the rotor brake on when the winds were strong and gusting. The brake was released about half way thru the start to help reduce blade sailing. It seemed to work. I know it's not a normal procedure but it may be done in the field I'm quessing. Maybe a question to send to Bell. Quote Link to comment Share on other sites More sharing options...
212wrench Posted January 22, 2007 Report Share Posted January 22, 2007 I have held a 212 in a strong wind during start and at about 25% it gets real hard to hold onto. Quote Link to comment Share on other sites More sharing options...
ZAPPER68 Posted January 23, 2007 Report Share Posted January 23, 2007 Starting up with the rotors stopped......now there is a novel idea. I've been doing that exact procedure for over 35 years and it works every time, at least on the Bell 47, Bell 206, Bell 212, Bell 412, MD500, R22, A109S, EC130B4 & AW139. I'm not too sure about other helicopters but I believe you can start them with the rotors stopped also. ZAP ZAP Quote Link to comment Share on other sites More sharing options...
C-FXFX Posted January 23, 2007 Author Report Share Posted January 23, 2007 Starting up with the rotors stopped......now there is a novel idea. I've been doing that exact procedure for over 35 years and it works every time, at least on the Bell 47, Bell 206, Bell 212, Bell 412, MD500, R22, A109S, EC130B4 & AW139. I'm not too sure about other helicopters but I believe you can start them with the rotors stopped also. ZAP ZAP Ok!so how do you do that with a 47! Oh! and by the way i know that is not a new idea...!! Quote Link to comment Share on other sites More sharing options...
Jay Flight Posted January 24, 2007 Report Share Posted January 24, 2007 I'm a new guy but I think he was getting at that aren't all rotors at rest when you go to start them or does your ground crew start the blades by hand before the start switch is hit? Quote Link to comment Share on other sites More sharing options...
Max Continuous Posted January 24, 2007 Report Share Posted January 24, 2007 Yeah I think you get it! :lol: :lol: Quote Link to comment Share on other sites More sharing options...
Spitzair Posted January 24, 2007 Report Share Posted January 24, 2007 One explanation I got, and I could be very wrong here, is that on larger multi-bladed helicopters the mast sits on an angle and the dampers slowly let the blades creep to wherever gravity takes them, so one blade or more will be in a lead position and another one or two is in a lag position and if you start 'er up slowly you have a significant out of balance condition whereas if you hold the binders on till your stove gets up to speed the inertia of the blades at rest cause 'em all to go to a full lag position on the dampers when the mast starts to turn when you let the brake go... Once she's up to proper RPM which now only takes a few seconds, the blades find their happy place and away we go! Clear as mud? Anyway, that's what I've been told so I have no idea how true it is though it does make sense to me. Quote Link to comment Share on other sites More sharing options...
Elvis Posted January 24, 2007 Report Share Posted January 24, 2007 On the S61 the #2 engine is started before releasing the rotor brake so the hydraulic power is available. Quote Link to comment Share on other sites More sharing options...
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