Re: Disymmetry of lift.....


"The OTHER Kevin in San Diego" <skiddz "AT" adelphia "DOT" net> wrote in
message news:ko45m156sjgpq3j7bb0achjevuhh4diq6k@xxxxxxxxxx
> On Fri, 28 Oct 2005 20:41:36 GMT, "Steve R"
>
> The Robby is a twitchy little bugger to say the least, and there *IS*
> some amount of "anticipation" required to fly it smoothly, but having
> something on the order of 120 hours in the thing, I don't even think
> about it. It kinda just happens.. There's an ag flyer in
> rec.aviation.helicopters than flies a Bell47 quite a lot. That's got
> paddles right?? I wonder if he knows.. He's got something like
> 24,000 hours and if memory serves, he got his ticket in 1954.
>
Nope, actually, the Bell 47 and the Huey style Bell helicopters have a
"stabilizer" bar. It's relatively short and has a set of weights on each
end, no paddles, so they're aerodynamically blind. The bar has a percentage
of cyclic control over the main blades which is why it can work to stabilize
the rotor system but there is no cyclic command going to the bar itself like
the flybars do on our models.

>>The first successful model helicopters were fixed pitch and hiller only.
>>They flew Ok but weren't very precise compared to the modern birds we fly
>>these days. Someone came up with the idea of mixing a direct control link
>>from swashplate to main blades with the hiller type control they already
>>had. The result was a more crisp response to a given cyclic command
>>without
>>too great a loss of the stability augmentation that the flybar allows and
>>that's how it's been ever since.
>
> Hey, if it ain't broke, don't fix it! I've been thinking about that
> damned Raptor head all day. Not a good idea 'cuz today was the final
> in my CFI ground school.. Hope I passed! lol
>

So do I! I'll keep my fingers crossed for ya!

Fly Safe,
Steve R.


.

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