Re: Re: seeking some F1D tips? from Fred Tellier on 2007-03-15 ([Indoor

From: Fred Tellier <fred-tellier_at_cogeco.ca>
Date: Thu, 15 Mar 2007 12:51:24 -0400

Hi Ignacio

Get or build a prop pitch gauge, I made a simple one from a protractor, I also use tissue tubes and check pitch before flying my props. Why I questioned pitch I average 48 RPM if everything is set correct with 9.5" loops. I understand your reluctance to use up your rubber supply, I would suggest using lesser batches while you are trimming as improvements can be made in planes props and set-up. 5-99 is like gold I only use it for F1D 3-02 and 10-97 are good enough for other events, where rubber weight is not a factor.

Fred
  ----- Original Message -----
  From: izgo
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Thursday, March 15, 2007 12:25 PM
  Subject: [Indoor_Construction] Re: seeking some F1D tips?

  Hello Fred,

  FT> It sounds like you need more turns, and you need to
  FT> improve your winding techniques

  Yes, probably im always afraid, traing to avoid destroying
  the little amont of rubber I have. I will try to get some
  more turns with a handleable torque. This way maybe I can
  get the 4 or 5 minutes extra you pointed me.

  FT> Are you sure your pitch is 30" your RPM seems low with that
  FT> low of pitch.

  Well, im not sure. The pitch I say is from the prop-block
  where I formed the blade, but blades have a bigger angle
  (I use paper tubes to hold spars). How much, not sure because
  I set them up by eye.

  FT> Are you sure your motor sticks cannot take more torque, if
  FT> they can't for sure that should be your next building goal
  FT> higher sites will need more launch torque.

  I think 0.35 in-oz is pretty close to limit, more than that is
  red zone. Im not using boron. Maybe I can improve motorsick
  stiffness by adding 4 boro, with a cost of some weight.

  FT> The rubber testing program I use is also a good tool for
  FT> improving your winding skills tor sticks. Good luck Fred

  Got the progam, and already doing some test, trying to match
  the numbers you got when tested several batches.

  Thanks!

  Ignacio.



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Received on Thu Mar 15 2007 - 09:52:26 CET