Technology and Paticipation

[Bob Richards]

Now that you mention it, the 5kg limit for record attempts is the takeoff weight. The model that Maynard Hill flew across the Atlantic had to weigh under 5kg when it was launched, if I am not mistaken. Over half the weight was fuel.
 
So, now the question is why does FAI pattern specify the weight without fuel? Hmmm...
 
BTW, I think Maynard Hill also holds the altitude record, or did at one time, something like 27k feet. I also believe it had a heater for the radio compartment.
 
Bob Richards.

vicenterc at comcast.net wrote:
In 2003 I had the opportunity to go to the Nats.  One day,  I visited the AMA museum.  When I was there I had the chance to talk with the curator.  He gave me a great tour.  During the tour he got a phone  call from a modeler in Colorado claiming that he broke the altitude for world record using a model airplane.  It was not good day for him since the curator told him that he was short for several thousand feet.  In the conversation they talk about the weight of the model.  When they finished I ask him what is the weight requirement for breaking records.  He responded " For model airplanes the maximum weight is 5 kgs or 11 lbs.  Anything over 11 lbs can not be use to set records using model airplanes".  I think this is the simple reason why the maximum weight is 11lbs to be considered a model airplane.
 
I think this is the single reason why we have the 5Kgs = 11 lbs limit.  This is International rule for model airplanes.  Therefore, it could be very difficult to change the weight limits.
 
Vince Bortone
 
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