Great synopsis by Don S. That last 25-30% of rubber weight contributes
almost nothing to theoretical duration.
Don D
_____
From: Indoor_Construction_at_yahoogroups.com
[mailto:Indoor_Construction_at_yahoogroups.com] On Behalf Of Don Slusarczyk
Sent: Saturday, March 06, 2010 9:45 AM
To: Indoor_Construction_at_yahoogroups.com
Subject: Re: [Indoor_Construction] Re: Optimum Rubber
2:1 works out mathematically but if you graph the relationship out you
will find that above ~1.4 to 1.5 to 1 the difference is off only by
about 2% of the theoretical maximum of the 2:1 ratio. Coincidentally
if you look at many 65cm rule F1Ds you find the rubber weight used then
was in the 1.4-1.5 gram range. Going above 1.5 to 1 generally is not
possible as the strength of the model can not handle a fully wound motor
of such weight. Imagine a 2.4 gram motor on a 1.2 gram F1D wound to
capacity. However some events do not follow this rule at all, LPP and
F1L are the first two which come to mind. LPP likes below 1:1 which may
be a result of the 12" prop limitation and 10" motor stick limitation.
F1L seems to like 1:1 possibly due to the motorsticks being somewhat
limited in length due to structural reasons. So it is not a steady rule
for all events.
Don
Received on Sat Mar 06 2010 - 14:57:05 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:46 CET