Re: Re: A perfect 1/4 motor F1D flight

From: Chris and Josette Borland <candjborland_at_surewest.net>
Date: Tue, 7 Jun 2011 12:48:12 -0700

On Jun 7, 2011, at 8:02 AM, Mark F1diddler wrote:

>
> Don't short yourself, Mark. Your record was flown in a 22' ceiling.
>
      Chris Borland - Sacramento


> Ignacio,
> I was hoping someone would take a stab at your original question,
> but it was so general that the answers would have required so many
> "ifs," and would seem like nothing new. There are no secrets to
> long flights except to juggle all the little balls together that we
> normally address individually. A 1/4 motor flight is the most
> useful when you are climbing 1/4 the height of your intended site.
> And even then, the eventual site may have different conditions
> rendering the tests not as useful--for example different altitude
> densitites of the air. 8 minutes on a 1/4 motor sounds okay, but
> how high is "1/3 of a tall site?" Whatever height you reached,
> multiple by 4, and that is the presumed site where your test gave
> useful information. Since you are trimming for the Serbia hall, I
> recommend climbing only 5.7 meters on 1/4 motor. (But haven't flown
> there myself.)
>
> How this plays out with specific RPMs per your earlier posted
> question is where the variables make general answers merely
> general, and would be concepts you probably already know. (Example,
> "Use up as many motor turns as possible, landing ideally at zero
> turns", if using VP.) I recall you once mentioned Fliagra article
> (in Files Section of Ind_Const.) where I mentioned the RPM profile
> of my low ceiling F1d. But that was merely what I ended up with
> that day considering my smallish prop, (17.5") the VP spring I had
> on that day,(I forget what,) and the motor I settled on (8.3" loop,
> IIRC,) to which I adjusted VP for the 23 ft scrubblable ceiling.
> Change any of those items, and the RPM profile would have been
> different. But one general RPM rule I've concluded for my style of
> VP F1d is I don't want to see lower than 33 at any time, nor higher
> than 62 at any time. Your miles may vary. HTH.
> Mark F1diddler
>
>
Received on Tue Jun 07 2011 - 12:47:42 CEST