Re: F1D rubber and o-rings

From: Fred Tellier <fred-tellier_at_cogeco.ca>
Date: Sun, 16 Sep 2007 12:51:14 -0400

Probably a 8 inch loop would be better, I think 240 mm if almost 9", I think you may not be winding to enough torque. How high are you climbing?

Fred Tellier
  ----- Original Message -----
  From: Tapio Linkosalo
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Sunday, September 16, 2007 2:08 AM
  Subject: [Indoor_Construction] F1D rubber and o-rings



  I rebuilt the fuselage of my F1D, model is still overweight, but this new
  fuz seems to withstand the motor strain. I hope :)

  Still have some problems with the climb. I used a 240mm loop of rubber
  that is about 1.5mm wide. With launch torque 50% above the cruise value
  (sorry do not have comparable readings..) the model climbed some 10 meters
  to fly for 8 minutes, but still landed with plenty of turns left. Thus it
  looks like I would need some higher cruise torque, so is my motor too thin
  or should I rather reduce the prop pich. The model weights 1.7 grams, so
  it is overweight. I could try higher launch torque, but having one motor
  tube fold under motor load excessive motor torque makes me nervous. Need
  to make a flight or two with F1M to rest my nerves, those motor tubes can
  stand any kind of abuse :)

  Another question is about O-rings. I've used plastic rings cut out of 4mm
  OD plastic tubing. These make inserting the rubber motor easy, but have a
  nasty tendency to rotate due to rubber torque and then shoot off the
  hooks. I use a diamond hook for the prop shaft and a simple angled hook
  (">") for the peg. Would smaller rings be preferable, or rather some other
  kind of hook design?

  -Tapio-



   

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Received on Sun Sep 16 2007 - 09:52:33 CEST