Re: Re: interesting link about ornithopters

From: Fred or Judy Rash <frash_at_chartertn.net>
Date: Thu, 24 Jun 2010 08:33:56 -0400

What if we made the "provisional" autogyro rules for rubber power
(perhaps hard due to torque and prop size) OR for electric power using
one 10-mAh LiPo (possibly easier)?

My "faux" autogiro flew about 25% longer and with a thinner motor
without the rotor. I have the times and average power (in mA) both with
and without the rotor if anyone thinks it is worthwhile for me to dig
out the data.

Fred Rash

On 6/23/2010 10:24 PM, Don Slusarczyk wrote:
>
> For the record, my "faux" autogiro flies noticeably worse with the
> rotor off then when on. On a 15 minute flight with no rotor flew about
> 3 minutes less than when on. It does make lift, just not as
> efficiently as the fixed wing does. In the calcs I did when I first
> did the "pinwheel" design, I assumed a 3:1 L/D on the rotor and that
> worked out quite well. I also know the autogyro Larry Loucka has also
> climbs higher and flies longer with the rotor on compared to when
> taken off. There is a set of alternate "provisional" autogiro rules in
> the AMA rulebook and as far as I know that version has never been
> flown since it was introduced about 20 years ago by Lester Garber (I
> believe). In the old days wingless gyros flew horrible (from the
> stories told to me by who flew them) the AMA record was just over one
> minute. Even under the new "provisional" autogyro in the current AMA
> book, I think Lester only got about 2 or 2.5 minute flights. The
> single rotor wingless free flight gyros flew horrible and that is why
> the rules were changed to allow wings. Basically you built a model and
> launched above your head and see whose model took the longest to crash
> to the ground.
>
> Don S
>
>> Please write us a good set of autogiro rules. I agree that the
>> current set of rules are not very good, but do not know how to write
>> better ones. I enjoyed the event but there were not enough
>> contestants to continue the event at the USIC. We had 2 or 3 most years.
>>
>> Fred Rash
>>
>> On 6/23/2010 2:37 PM, Bob Clemens wrote:
>>> John Kagan aptly pointed out:
>>> "The record setting indoor free flight ornithopters get their lift
>>> from the canard and mainly get thrust from the flapping wings."
>>> Hmm... Sort of like the faux indoor autogiros get their lift from
>>> their wings, not from their rotors.
>>> Bob Clemens
>>>
>>>
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Received on Thu Jun 24 2010 - 05:34:03 CEST