Rotor stall.

[C. Beaty]

It’s supposed to show you Birdy, that to become a celebrated poet, it’s not always necessary to use the Queen’s English; you can even mix in some Scots Gaelic.

When you get too old to chase cows, perhaps you could take up poetry.

YouTube - Scottish Weather Forecast (in Scots Gaelic)

 

[Jazzenjohn]

It looks like Chuck Beatty is trying to put YOU out to pasture Birdy! I have a difficult time trying to picture going from chasing cows in a gyro to scratching out poetry in a rocking chair by the fire...

 

[birdy]

Am wundern the same John.
Think ol CB has lost the plot abit.

Why the hell would i wana be a celebrated poet?
Wots to celebrate wen your too clapped out to do anythn productive?
Ill be pushn up spinafex long before i rite me first poem.

 

[Jean Claude]

Hey! nice, guys! nobody has an answer for me? (#98) Doug? Chuck?
Thank you

 

[dragonflyerthom]

Hey! nice, guys! nobody has an answer for me? (#98) Doug? Chuck?
Thank you

This thread went off topic a long time ago Jean Claude. Good Luck in getting your answer.:boink:

 

[birdy]

Im not the bloke to answer this with any authority Jean, but see'n as the 'brains' havent... .
My opinion is that a heavy rotor has more serious drawback. It remains longer in the situation of slowdown (AoA too low), because of gyroscopic inertia and damping of pitching. In the end, a lower rpm is reached despite a slower deceleration. Is this correct?
Yes, your correct.
Theres always a trade off with any comparison.
Light blades respond faster to AOA changes, but dont hold over speed for as long.
Heavy blades give you a longer first chance, but its a long wait for a second chance.

 

[Doug Riley]

Jean Claude: Yes, I agree that, once a heavy rotor enters a low-disk-AOA situation, it will stay there longer than the light one. It may stay long enough to reach a point of no return.

My older post referred to the interaction between the airframe and the rotor -- specifically, the role that rotor plays in preventing a low-disk-AOA situation in the first place. A heavy rotor offers more rotor damping, as you observe. This makes it less likely that an airframe that has developed some angular momentum in a nose-down direction will carry the rotor with it to a low-disk-AOA condition.

I began thinking about this because of the persistent "theory" that all gyros can "bunt over" of their own accord, even without a high thrustline or low airframe center of drag to create a nose-down moment. I think this theory is wrong. At the same time, I think that a low-inertia, high-RPM rotor on a no-HS gyro such as a Bensen comes close to validating the "theory."

 

[C. Beaty]

The chord line of DWs is set to zero at the root and +5º at the tip. Line of zero lift is ~ 1.8º above chord line.

Chord line is line from leading edge to trailing edge.

 

[Jean Claude]

At the same time, I think that a low-inertia, high-RPM rotor on a no-HS gyro such as a Bensen comes close to validating the "theory."

I agree Doug. My conclusions on the best security of a lightweight rotor are valid only with a HS.
Jean Claude

 

[Chopper Reid]

Birdy, as you know I use Patroneys, 27 ft and flying today, I tried to replicate what you are talking about although my impersonation would not have been anywhere nearly as quick as what you would have done it and no where as elegant iether this is what I found, lots of power, stick back, very little forward speed, rotor revs indicating lowest of 275, couldnt get them any lower, mostly has 280, took a big breath, give the stick a big push forward, revs stayed about 280 untill the stick was bought back.

It wasnt as spectacular as I thought it might have been but there again, as I said, I'm sure it was a ordinary impersonation of how you do it but I did get a result!! With a heavier gyro, I got a pretty quick loss of height too

Having used AK's and Ricks, I reckon they slow a lot more than the Patroneys

 

[birdy]

Not sure wot your getn at Brian, but im talkn big rrpm changes, like the peak of an inertia hover [ max over speed] and leaven it abit late to power out [ falln into a virtical decent sink].

A lite set wont let you hover long, but will regain rpm earlier if you do drop though.

 

[Chopper Reid]

Not sure wot your getn at Brian, but im talkn big rrpm changes, like the peak of an inertia hover [ max over speed] and leaven it abit late to power out [ falln into a virtical decent sink].

A lite set wont let you hover long, but will regain rpm earlier if you do drop though.

There's always comparisions between alloy [usually lighter] and heavy rotors such as Patroneys [with lots more pitch] and I have flown both and have alsways noticed the alloys speed up /down fairly quickly, much quicker than the Patroneys and it took a lot of hours flying the heavier blades before I really got to love the " hang on" effect they have and the fact that no matter what I'm doing in the gyro, I always know that my rotors are ready to fly out of whatever position I got the gyro into.

So in relation to rotor stall, or being able to make a rotor stall, I would say that it would be a lot easier for me to stall a lightweight blade. For you Birdy with a much difernt gyro, the opposite is probably true.

What do you reckon ? be a lot easier talking around the camp fire after a rum or three than on this computer !!!

 

[Graeme Monro]

Rum

Rum

There's always comparisions between alloy [usually lighter] and heavy rotors such as Patroneys [with lots more pitch] and I have flown both and have alsways noticed the alloys speed up /down fairly quickly, much quicker than the Patroneys and it took a lot of hours flying the heavier blades before I really got to love the " hang on" effect they have and the fact that no matter what I'm doing in the gyro, I always know that my rotors are ready to fly out of whatever position I got the gyro into.

So in relation to rotor stall, or being able to make a rotor stall, I would say that it would be a lot easier for me to stall a lightweight blade. For you Birdy with a much difernt gyro, the opposite is probably true.

What do you reckon ? be a lot easier talking around the camp fire after a rum or three than on this computer !!!

Found some Rum in Fiji the other day on a stop over, might be just the stuff for this occasion, 58% proof.

Graeme.

 

[Fl90]

58% or 58 proof......I've won many a bet on 58%. Probably did some permanent damage as well. But it doesn't bother me now, bother me now.

Phil

 

[birdy]

What do you reckon ? be a lot easier talking around the camp fire after a rum or three than on this computer !!!
Well yeh, wen you getn your ass in gear and taken this NT holiday you pormised Rosey years ago?

 

[Chopper Reid]

What do you reckon ? be a lot easier talking around the camp fire after a rum or three than on this computer !!!
Well yeh, wen you getn your ass in gear and taken this NT holiday you pormised Rosey years ago?

Yer not going to let me get out of that huh!

Well, its looking like our mustering trips away are nearly finished, number 1 son has a new Savannah coming and number 2 is going to start gyro lessons wintertime so its looking like we are going to become redunatant soon.
Its good and bad, will miss the mustering but enjoy having 6 months of the year back so if that happens, expect an old Nissan down that mongrel track !!

You wont get off lightli iether Graeme Monro. BTW, I have tasted Fijis rum too, not bad ......

 

[Graeme Monro]

American Honey.

American Honey.

I have purchased 3 bottles of this brew for my mate Russ so far, and have consumed them all, he may not get any at this rate. I will have to get the fiji rum on the way home to try. I will keep some for your visit Brian when you are made redundant.

Graeme.

 

[Chopper Reid]

I have purchased 3 bottles of this brew for my mate Russ so far, and have consumed them all, he may not get any at this rate. I will have to get the fiji rum on the way home to try. I will keep some for your visit Brian when you are made redundant.

Graeme.

Looks like you need to buy twice as much rum so that you get to have some left !!

 

[All_In]

Looks like you need to buy twice as much rum so that you get to have some left !!

I really like the way you think!