Over speeding rotors

[asra]

Scinario.......heavy machine, powerfull engine. Throwing this, or for that matter, any machine,into repeated hard fast, tight turns, is there a possible consequence that one would regret. Have done regularly, but is there a line not to cross.????????? Safe flying always.[]RDC

[birdy]

Solong as the rrpm don't excead the manufacturs limits theres no problem.I'v found when the rotors get too 'excited' I have to backoff the power,otherwize it just wants to climb between banks.Occasionaly the over excited rotor can be annoying coz you gota back off when your in a hurry,but it's either bachoff or go up.The only limits your likely to excead on the rotors would be the centriphical force or tip speed maybe.But if your machine is rotored right,[correct rotor loading] I dought you could overspeed them to a catastrophic extent.Crist knows I'v been try'n hard for years,and I'm still ere.Add on.There is a slight danger of getting closer to an envelope boundry too.If your rotors are highly excited and you stick forward to prevent a climb,you could bunt.With or without power.Ignorance is bliss............but only till you realise you were.Ingratitude stinks.......be generous carefully.

[asra]

Originally posted by birdySolong as the rrpm don't excead the manufacturs limits theres no problem.I'v found when the rotors get too 'excited' I have to backoff the power,otherwize it just wants to climb between banks.Occasionaly the over excited rotor can be annoying coz you gota back off when your in a hurry,but it's either bachoff or go up.The only limits your likely to excead on the rotors would be the centriphical force or tip speed maybe.But if your machine is rotored right,[correct rotor loading] I dought you could overspeed them to a catastrophic extent.Crist knows I'v been try'n hard for years,and I'm still ere.Ignorance is bliss............but only till you realise you were.Ingratitude stinks.......be generous carefully.[8)]Yea had all of that, wanted to know if I pressd the envelope even further......what??????/RDC

[Brian]

Hi Russell, this is a second hand story but I was told of a pilot who is in Birdy's 'class', years ago who from a fair altitude, put his gyro into a spiral descent and just kept winding the rotors up. Apparently the rotors got to a certain speed and stopped, whether this was due to the rotors unable to go faster or the spiral dive being unable to be tightened I'm not too sure !! However, I dont think most of us could get to the rotors outer linit in regard to 'overspeed' in fact I dont call it overspeed cause rotor revs vary all the time and it depends on the size and weight of the gyro as to the rotor revs achieved.I would class my gyro as a heavy, powerfull gyro and I find that the drag of repeated turns usually slow the airspeed till after a few 'as hard over as I can go' , the airspeed slows so much that straight and level is needed to accelerate or you need to use the excess engery being stored in the rotors to climb to a safer hight and regain airspeed.Hope that helps.You never know how far you can go, till you get there !

[Tim]

Rotors come with a life time guarantee against overspeed.................Tim McClure

[NiqueNaque]

The rotors should as I understand rev in relation to the weight of the machine they are supporting.With variations in weight due to variations in G forces they will rev up and down in response, with lag of course commensurate with their inertia, this is why Birdy will float and have to 'back off' after loading them up in a turn. In any maneuvre you will only be able to attain a particular level of G's, so of course there will be a limit to the amount of 'overspeeding' you see with the rotors.HTH,Nick.

[birdy]

And it's the air's compressability that limits how many G's you can pull.Ignorance is bliss............but only till you realise you were.Ingratitude stinks.......be generous carefully.

[NiqueNaque]

Birdy,Your G's can be unlimited, it just depsnds on how hard you hit the ground...Cheers,Nick.

[asra]

" Your G's can be unlimited, it just depsnds on how hard you hit the ground... "And even that is limited by terminal velocity. []

[Mark Horan]

Birdy,I hope that "ingratitude" isnt directed at me!!Because I am truely greatful, a little humbled, but very greatfulRegards Mark.

[birdy]

Why wood it Mark????Mmmmmmmmmm , mebe I know why, but no,it's advice to anyone woh ain't been shafted yet.Ignorance is bliss............but only till you realise you were.Ingratitude stinks.......be generous carefully.

[Mark Horan]

As long as you dont think youve been shafted!Give me a ring on friday night.Regards Mark.