[CIAM-F6-Working_Group] Re: Artistic Aerobatics model weight
- From: "Benoit DIERICKX" <benoit.dierickx@xxxxxxxxxxxxx>
- To: <ciam-f6-wg@xxxxxxxxxxxxx>
- Date: Sun, 12 Jul 2009 10:01:02 +0200
Dear Guy,
I think there are some misunderstandings here.
In the previous e-mail, when we spoke about a 8kg weight limit, it is for
planes without any span or lenght limit. That's why this rule could open the
WAG to the 2.2m / 2.3m monoplane or what ever. Those planes have more show
attractivity but keep the freight cost in the range of a 2m plane. A 8kg
Biplane will naturally be a bit smaller in span, that's it.
I agree that a 2m monoplane doesn't need 8kg, certainely to be competitive!
About smoke on gas engines:
With usually poor smoke quality, some people are still using very polluting
smoke fuel like plain diesel oil, which, I think too, should be forbidden.
But the "Mineral oil" (Liquid Parafine you can swallow like used against
constipation :-)) is a LOT less polluting and works very very well. (the best
and expensive smoke fuel are mainly based on Mineral oil)
As the heat produced by a 50cc gas engine is quite low, you can not inject that
much of smoke fuel. The flow is around 100cc for 1 min of good smoke. So, a
250cc smoke tank is big enough for a 4min flight as, unlike fireworks, it got
the "on/off" function.
I hope this will be helpfull.
Benoit
----- Original Message -----
From: Guy Revel
To: ciam-f6-wg@xxxxxxxxxxxxx
Sent: Thursday, July 09, 2009 7:52 PM
Subject: [CIAM-F6-Working_Group] Re: Artistic Aerobatics model weight
At 07:03 09/07/2009, you wrote:
I think the Biplanes add interest to the competition, and if I remember
correctly AA is designed to take precision flying to a wider audience, so to
exclude something that the public can easily identify with as different seems
at odds with the AA concept.
Biplanes have made a big resurgence over the last 3 years in F3A including
winning the last worlds, People who know nothing about pattern or RC are always
drawn to these aircraft. Good for the spectators.
8 kg limit sounds good also. Nice balance of size, cost, ease of transport.
Hi Mike,
Thanks for the input. I must say I nave not seen any biplane at freestyle
meets in Europe for years, but I have no strong opinion for nor against. I am
only trying to keep rules as simple as possible.
In the event we still allow biplanes, should they have the same wingspan
limit as monoplanes or a lower one ?
Also if you want to keep a weight limit, then I would recommend setting it
lower than 8 kg. Many 2-metres planes that are not derived from F3A planes
never exceed 6 kg, even with heavy gasoline engines, particularly as most AA
planes have a lighter, open bay r wing structure, as was evident during WAG in
Turin and even the fully-moulded, composite plane by Ales Zapletal weighted not
more than 4.9 kg.
It is my impression that the only reason to set a weight limit at 8 kg would
be to allow large capacity tanks for smoke systems, which is something I really
would like to discourage, as polluting by disseminating smoke fuel over the
ground is really a thing of the past and actually illegal in a growing number
of countries. It has been amply demonstrated that ribbons, smoke cartridges,
fireworks etc. are quite effective and much less polluting.
If you really want to set up a maximum weight, I feel that 7 kg would already
allow any kind of structure and engine with still a large margin.
Comments ?
Guy R.
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