Helicopters without correlators?
Helicopters without correlators?
Join Date: Aug 2008
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Yes, the Bell 47 did not have a governor to correlate the pitch-setting with the required engine power-setting.
I took my first helicopter hours at the controls of this historical machine decades ago.
I took my first helicopter hours at the controls of this historical machine decades ago.
Join Date: May 2002
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I'm pretty sure the Bell 47 has a correlator. Have a look at the pilot's side of the aircraft, you will see a thin box with a rod going forward to the cabin.
My memory is shot but I am sure this is a correlator box.
My memory is shot but I am sure this is a correlator box.
Join Date: Mar 2006
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Next Tuesday it will be exactly 39 years since I first flew a Hiller 12E and, even without a correlator, it was a great machine - 50 hours later I 'progressed' to the Whirlwind 7, which did have a correlator, but wasn't half as much fun.
Join Date: Nov 2008
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I design, build and fly UAVs. The tail rotor is correlated to the throttle. More left pedal, more throttle, less left pedal less throttle. We also correlate pitch and tail rotor, particularly useful when climbing and descending vertically.
Are there any machines, other than Lynx, that have correlators from pedals to throttle/collective (governed or otherwise)?
Join Date: Jul 2000
Location: Toledo, OH
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To be technically correct every Enstrom prior to the F28F/280F does not have a correlator. It is also the only piston helicopter currently in production that does not have an automatic mixture control, so you can lean the mixture during flight.
Join Date: May 2008
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Of the 4 hiller 12E's i've flown, all had correlators......none had governors....other than the soloy turbine conversions but thats a different story. As mentioned there is a box linked in to the collective and throttle cable. Locations vary by model but it is generally the size of a paperback book. The two both work towards the same goal but function differently and i think that may confuse some that are not familiar.
Governor senses RPM and adjusts automatically. Usually no manual throttle adjustment necessary.
correlator adjusts throttle based on the position of the collective. It gets the rpm in the ball park but manual throttle "fine tuning" is more or less required.
Governor senses RPM and adjusts automatically. Usually no manual throttle adjustment necessary.
correlator adjusts throttle based on the position of the collective. It gets the rpm in the ball park but manual throttle "fine tuning" is more or less required.
Join Date: Nov 2004
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Originally Posted by chopjock
I design, build and fly UAVs. The tail rotor is correlated to the throttle. More left pedal, more throttle, less left pedal less throttle. We also correlate pitch and tail rotor, particularly useful when climbing and descending vertically.
Agreed, RVDT. Talking to some of my colleagues with helicopter control system experience, it gets to the point that mechanical systems get so complicated that you start to wonder whether the FMEAs can account for all the linkages! Of course we all know that software never goes wrong.
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Graviman
Yes electronic fly by wire servo system. Adjustment and set up by mark one eyeball.
Interesting activity, Chopjock. I'd like to learn more about this. I'm guessing this is electronic if you account for the TR power-airspeed curve? Which chip/software do you use BTW?
I learned to fly in an Enstrom F28A. No correlator. It was easy to learn, and I figure if I can learn it anybody can. It became very natural to twist the grip as I pulled or dropped collective, also had to pull in a little more for a left pedal turn and roll a bit out for a right. I do agree there was no automatic mixture control though we always left it rich and stayed low. I have a little time in a Schweizer 300CBi, and that sure looked like a manual mixture control to me. I'll check with one of my buddies and report back if I'm wrong.
-- IFMU
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