SEN 2365
- A basic Q model.
- I’m with Frederick
- And I’m with Ismail
A basic Q model.
From: Aram Schlosberg
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A response to queries about assembling a basic Q model. I happen to be flying just the right one, based on a B-model. It’s a direct drive with a 9 x 6” folding prop using a Cobra 2204/56 that is mounted onto the fire wall. 4 external screws, making it easy to set and adjust the motor’s bearings. The battery is a 2S Lipo 325 mAh discharging at 70 C.
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The trick is to trim the motor tube from both sides to attain a 55-60% CG with a short nose. This might require a new longer tail boom. (CF tail booms from Stephanchuk are my preference.) The model is trimmed like a B-model with right and down thrust, and it climbs at the glide decalage. The timer operates a servo with the following releases: (1) mid rudder (typically after 10 seconds). (2) final rudder and releasing the left wing wiggler holding up the TE by about 0.060”. (3) DTing the model.
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The e-timer should allow an RDT (combined with shutting down the motor) as B-wings are strong enough survive both simultaneously. With the new rules one needs an energy limiter (EL) that can work with the e-timer. The simplest one is by Dick Ivers. (It need a PC interface.) A heavier self-contained EL is by Sidus. The beacon should be self-powered, otherwise it drains valuable energy.
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How does all this paraphernalia (controller, battery e-timer, EL, servo and beacon) fit into the pylon unit? The e-timer, servo and beacon live in the pylon. The controller is just behind the motor and I strongly recommend using 2 mm bullet connectors between the two. The battery needs 3.5 mm bullet connectors, per the rule’s polarity and is placed next. The EL has to be accessible to the e-timer and for programming. (Some just tape it to the right side of the fuselage.) All the fuselage items can be placed through openings in the fuselage (top or bottom) that are covered from excess motor tube cutoffs. As the battery tends to move, it should be contained or taped.
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The catch is that all these parts have to be placed to attain the models’ correct CG. In fact, most of the work on a Q model is on the pylon unit. …. Everything while standing on one foot. ////
I’m with Frederick
From: Stuart Darmon
Frederic Aberlenc is making a very important point. We can’t allow organisers to make arbitrary departures from the sporting code during a contest. Obviously some sites require ‘local rules’ to be applied, and as the world continues to change this will become increasingly common; this makes it very important that bad precedents should not be accepted. Any departures from the rules must be announced in advance. A catch- all disclaimer like “The CD reserves the right…” is not adequate. As your correspondents often point out, a great deal of time, money and effort is put into preparing for and travelling to World cup events. We all appreciate the efforts of organisers and sympathise with their difficulties, but you can’t just make up the rules as you go along.
Regards,
Stuart
And I’m with Ismail
From: Ross Jahnke
Roger,
I concur with Ismail Sarioglu that a double flight-line of some kind
is preferable over a very long flight line, or splitting the fly-off into
two groups as was done at the last WC. I assume that by “zig-zag” Ismail
is suggesting that the poles in the second line are staggered in relation
to the poles in the first line, so that one competitor is not directly
behind another. I also concur with Mike’s suggestion to return to seven
rounds, to reduce the number in fly-offs.
I think that Ismail’s proposal could be applied to all F1 events, not just
F1B, for easy pole set up on the field. A provision setting a maximum
number in a single line (20?) would help organizers decide when and how to
deploy a second row. If there are 31 in the F1B fly-off they make one row
of 16 and another of 15. If there is also an F1C fly-off with seven people
that evening, they all line up on the first row.
Ross
Editor’s Comments . Parallel lines might be a problem with towline management and sportsman safety for F1A and possibly the distance from the line with F1C ? Would work with Q
The general consensus at the last World Champs was not in favor of the split fly off and how it was done.