YK. . .thanks for your contributions of today and yesterday.
As also pointed out by engineer Steve Fujikawa in his material in the RDS
website, if 30 degrees of aileron deflection will suit the purpose, the
bend in the aileron shaft can be cut to 32 degrees. This results in a
mechanical advantage that doubles the effective torque and resolution of
the servo. This would be meaningful in higher speed applications such as
slope racing. I know I am not expressing this in proper engineering terms,
but it may be better understood by some readers.
Thanks for your support.
----------
> From: YK Chan <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: Re: [RCSE] RDS on Slopers?
> Date: Saturday, May 26, 2001 7:03 PM
>
> Aileron force:
> The moment force analysis I have seen so far are unrealistic, as it is
> static based. Static based refers to wind tunnel condition at which wing
is
> not flying (to be exact not in a dynamic condition banking at a certain
> rate at a given aileron input). A static analysis will produce horrendous
> moment force demand that no popular servo can provide. Most writers of
> subject are confused themselves between aero-static and aero-dynamics.
We,
> however, diligently follow their direction at face value.
>
> RDS understanding:
> The aerodynamic force at the ailerons will oppose the RDS rod end section
> similar to the way we torque an Allen Wrench (hex key). Please also see
the
> transfer function (input degree vs. output degree) in spreadsheet
> downloadable at Harley's web-site. The in/output transfer (90* bend) is
> nearly 1:1 at low angle displacement and soon enters much less than
unity,
> beyond which produce increasing torque amplification. Such
characteristics
> is especially favorable to flap applications. On the other hand, RDS in
> aileron application comes in with torque rod end section bend at 45* and
> this will provide even more torque amplification from input axis (the
> servo) to output axis (the hinge).
>
> I trust you will enjoy your new RDS.
>
> YK
>
> ----- Original Message -----
> From: Paul Klissner <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Saturday, June 02, 2001 9:46 AM
> Subject: [RCSE] RDS on Slopers?
>
>
> : What about gliders that take a lot of stress in flight?
> :
> : I actually have a bag of RDS couplers I bought from Harley,
> : awhile back, intrigued with the concept, but have never used.
> :
> : The unverified concern I heard is that the axle that conveys
> : the servo's force would be difficult to make rigid enough to
> : avoid being spongy against the opposing torsional
> : forces between the servo and the wind pressing hard
> : on the control surface.
> :
> : In other words aillerons under a lot of force might not
> : hold their position as strongly as normal linkages and would
> : be spongy, at least relatively to the more conventional linkages.
> :
> : I'm not saying that this is the case for sure, as I've never
> : tried it. I'm saying I've been warned, and the argument made
> : sense to me, at least enough to want to exercise caution.
> :
> : Can anyone with practical experience and a clear understanding
> : of this address that concern honestly and accrurately?
> :
> : -Paul
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