rotor brakes

What are the limitations on rotor brake use?
Can you throw off the lead-lag if you "stomp the brakes"
too hard?

Bill

On the Jet Ranger you can engage it under 38%, at about 6% it makes an
unnerving chatter that I never liked. According to people at the factory
you're just supposed to fully engage it under 38%, no pussyfooting
around. I usually disengage it at low RPM and let it coast to avoid the
chatter region, then lightly re-engage it just to stop the blades 90
degrees abeam so I can throw the tiedown over them easily.

I know one thing for sure, the damn brake pads are expensive. I'm sure
they're really just some stock automotive part, but you can count on
spending 10x more than the Napa equivalent.

Your flight manual should describe proper operation, but since brakes
are usually an option, it might be in the supplements section.

Bart

Bill Chernoff wrote:
What are the limitations on rotor brake use?
Can you throw off the lead-lag if you "stomp the brakes"
too hard?

Bill

Bill: You need to tell them that you will be the author of the POH for your
ship. I'm curious about an engineering answer to your question as I
wouldn't mind avoiding grabbing the T/R drive shaft with my hands. the
hands are starting to look like I really work for a living..embarassing!
I'm sure that I can't knock the lead/lag out with this rotor brake.
BTW. The problems I told you about before regarding the operation of the
Pro-Drive balancer giving scattered phase angles has been resolved. I moved
the reflector to the swash plate and mounted the sensor to the control arm
close by. I think the only remaining problem is to adjust the width of the
reflector until I get better resolution on the phase angle. The present
reflector tape is probably some 15-20 degrees wide.
Also the DRO you sold me continues to work great. It is at least on par
with a much more expensive one on my mill. Thanks again.
BTW2: How are you coming on your ship design?
Stu Fields
Builder, Pilot and Broker for the Safari Kit Helicopter.
"Bart" wrote in message
...
On the Jet Ranger you can engage it under 38%, at about 6% it makes an
unnerving chatter that I never liked. According to people at the factory
you're just supposed to fully engage it under 38%, no pussyfooting
around. I usually disengage it at low RPM and let it coast to avoid the
chatter region, then lightly re-engage it just to stop the blades 90
degrees abeam so I can throw the tiedown over them easily.

I know one thing for sure, the damn brake pads are expensive. I'm sure
they're really just some stock automotive part, but you can count on
spending 10x more than the Napa equivalent.

Your flight manual should describe proper operation, but since brakes
are usually an option, it might be in the supplements section.

Bart

Bill Chernoff wrote:
What are the limitations on rotor brake use?
Can you throw off the lead-lag if you "stomp the brakes"
too hard?

Bill

" around. I usually disengage it at low RPM and let it coast to avoid the
chatter region, then lightly re-engage it just to stop the blades 90
degrees abeam so I can throw the tiedown over them easily.

The K-Flex short shaft has its own rotor brake that does not chatter --
A most pleasant effect of this modification for the 206.
Gaylon

Wasnt there some kind of AD that came out recently on the Kflex shafts?
I've heard a lot of people say good thinkgs about them, but I haven't
yet seen enough benefit to want to swap out the factory one. Am I
missing something?

Bart

gaylon9 wrote:
" around. I usually disengage it at low RPM and let it coast to avoid the

chatter region, then lightly re-engage it just to stop the blades 90
degrees abeam so I can throw the tiedown over them easily.


The K-Flex short shaft has its own rotor brake that does not chatter --
A most pleasant effect of this modification for the 206.
Gaylon

What do u mean by chatter region, some kind of resonance frequency ?

"Bart" wrote in message
...
On the Jet Ranger you can engage it under 38%, at about 6% it makes an
unnerving chatter that I never liked. According to people at the factory
you're just supposed to fully engage it under 38%, no pussyfooting
around. I usually disengage it at low RPM and let it coast to avoid the
chatter region, then lightly re-engage it just to stop the blades 90
degrees abeam so I can throw the tiedown over them easily.

I know one thing for sure, the damn brake pads are expensive. I'm sure
they're really just some stock automotive part, but you can count on
spending 10x more than the Napa equivalent.

Your flight manual should describe proper operation, but since brakes
are usually an option, it might be in the supplements section.

Bart

Bill Chernoff wrote:
What are the limitations on rotor brake use?
Can you throw off the lead-lag if you "stomp the brakes"
too hard?

Bill