Re: Fwd: Bill Gowen's F1M

From: gerard moore <grrd_moore_at_yahoo.co.uk>
Date: Fri, 8 Jan 2010 18:38:17 +0000 (GMT)

Hi. I have been using 4 strand motors on my F1m and sometimes on F1d. The main benefit for me is that they do not break catastrophically in flight as the knots hold back the loose ends after a break.
My F1m can be launched at around 90g/cm torque, the stripped rubber is around 1.1g/m or slightly less. (march 02)
The strands need to be evenly lubricated and carefully stripped or they will have a shorter life as opposed to the more common two strand motor.
 
Regards, Gerard.



________________________________
From: Bill Gowen <b.gowen_at_comcast.net>
To: Indoor_Construction_at_yahoogroups.com
Sent: Fri, 8 January, 2010 15:42:22
Subject: Re: [Indoor_Construction] Fwd: Bill Gowen's F1M

 

Gary
You're probably right about the knots.

There's another accidental benefit involved. My high ceiling F1M motors - which I've made a lot of - are usually in the .075 to .080 range. The left over part of the strand can sometimes be used either for A6, F1L or a 3 strand F1M motor depending on the thickness of the off-cut.

----- Original Message -----
>From: Warthodson_at_aol. com
>To: Indoor_Construction _at_yahoogroups. com
>Sent: Friday, January 08, 2010 10:22 AM
>Subject: Re: [Indoor_Constructio n] Fwd: Bill Gowen's F1M
>
> 
>Bill,
>Thanks for that clarification. I have heard of even numbers of strands, but never odd, before. It seems to me that one knot (as would be required for an even numbr of strands) would use less rubber than two knots (as required with an odd number of srtands).
>Gary
>No. I really haven't seen a difference. I've had a couple of exceptional 2 strand motors and a couple of exceptional 3 strand motors. These were all about the same length and had about the same characteristics from max turns and torque through the entire unwinding curve. I've also used 4 strand motors that didn't seem to be much different from 2 strand motors.
>>
>>The 3 strand motors were a 2007 experiment to see if I could use less rubber in the knots compared to a 2 strand motor. I really don't know if they were successful in that regard. What I know for sure is that I hit a really good stretch of 3/02 rubber that produced some outstanding motors. I used a 3 strand motor to do the site record at USIC 2007, a 2 strand one to do the 2007 WR and a 3 strand one to do the 2009 WR - all from the last little bit of that batch of 3/02.
>
>
>
>
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Received on Fri Jan 08 2010 - 10:38:57 CET