Ignacio
The Rpm at various parts of the flight is very important for me as I can tell if my flight attitude ( nose up ) is correct and helps adjust the decalage to get optimum trim. It is even more important when one starts using a VP as the closing of the blades can be tracked. I take RPM readings at one minute intervals through the flight. Accept in Slanic where it is harder to see the prop so I got a lot less readings. Ignacio a stroke watch as used by Rowers in quite valuable for this, mine holds enough readings to document the entire flight.
As noted in the reply from Ignacio on props for 9.5 inch F1D motors. I used a 19" x 29" flaring shaped prop copied and shrunk down from what Jim Richmond used with 65 cm planes at 2000 WC ( plan was in INAV) with this length motors at Slanic. My best time of 34:31 was done with a 9 5/8" 5 99 motor wound to 1715 turns at .5 in/oz I used all turns dead stick just before touchdown. I used the same motor the next round ( mistake was not rested enough ) wound to 1775 at .5 but did not get enough power and landed 33:28 with 110 turns remaining. Flight RPMs were quite similar but the climb was less. The 5 flyers that finished ahead of me all got to the top and even bounced on some flights, my best was just below the catwalks and the second was probably 20 feet lower.
Ignacio try to fly with longer motors, your plane at 1.3 gms should climb well with 9" motors, do whatever adjustments to the plane and prop to get it to the ceiling. The 9" motors should take 1500 or more turns and with a 48 RPM average you will reach the 30 minute range.
Fred
----- Original Message -----
From: dgbj_at_aol.com
To: Indoor_Construction_at_yahoogroups.com
Sent: Wednesday, March 14, 2007 5:49 PM
Subject: Re: [Indoor_Construction] Re: seeking some F1D tips?
5) What is your cruising rpm?
Not sure about this, I will check on next flights.
While you are at it, measure the torque in level flight. This corresponds
to the highest point on your flight trajectory curve.
6)What batch and size is your rubber?
Tan II 5/99, average 1.35mm x 210mm (0.053" x 8.26")
And what is the thickness of the rubber?
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Received on Wed Mar 14 2007 - 16:18:22 CET