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by calgoddard
January 21st, 2020, 8:18 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 564
Views: 38399

Re: Wright Stuff C

In the previous post lechassin brought up an important point. I have previously given the following advice on this forum but for some reason it is rarely followed. If you are having trouble trimming your airplane and seek advice from experts who post on this forum please post a link to a YouTube vid...
by calgoddard
January 14th, 2020, 6:21 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 564
Views: 38399

Re: Wright Stuff C

This post analyzes the potential use of a gearbox in a WS 2020 airplane which has been discussed previously in this thread. The primary goal of using a gearbox would presumably be more efficient use of the energy stored in the rubber motor given the tiny propeller dictated by the WS 2020 rules. Any ...
by calgoddard
December 18th, 2019, 5:37 am
Forum: Wright Stuff C
Topic: F1D Junior Team Selection Contest
Replies: 20
Views: 4685

Re: F1D Junior Team Selection Contest

Great article Chuck! Your students should be very proud of their accomplishments in free flight modeling. Their success is in large part due to your tremendous investment of time as a mentor. You should be aware that Kang Lee, a recent World F1D Champion, would probably be happy to give your student...
by calgoddard
December 10th, 2019, 10:42 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 564
Views: 38399

Re: Wright Stuff C

In regard to choosing a biplane versus a monoplane under the WS 2020 rules, you may wish to consider the following comments in making your decision. The wing loading of a biplane with two 30 cm x 8 cm wings will be significantly lower than a monoplane with only one 30 cm x 8 cm wing. The biplane sho...
by calgoddard
December 8th, 2019, 8:37 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 564
Views: 38399

Re: Wright Stuff C

Lechassin – That was a very nice tutorial you just posted about decalage, CG and prop pitch. I would like to add the following comments that relate to prop pitch. In the hobby of rubber powered airplanes, the pitch-to-diameter ratio (P/D) is a very significant parameter that needs to be optimized. I...
by calgoddard
October 3rd, 2019, 8:33 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 564
Views: 38399

Re: Wright Stuff C

Sizing rubber motors in terms of length and weight to achieve maximum flight times requires experimentation and detailed flight logs. The wound rubber motor is the source of energy so the more rubber your model carries the more energy it can provide. The problem is that the weight of the rubber moto...
by calgoddard
October 3rd, 2019, 8:31 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 564
Views: 38399

Re: Wright Stuff C

Here is a link to a video which shows an example of the standard practice used by experts for winding the rubber motor of an indoor duration stick model airplane: https://www.youtube.com/watch?v=nhYSSM8YZVA In the video the rear end of the rubber motor is connected to a torque meter which Bill Gowen...
by calgoddard
September 26th, 2019, 1:04 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 564
Views: 38399

Re: Wright Stuff C

Coach Chuck is right - the half motor stick should have a length that is half the hook-to-hook distance of your airplane.

I got caught up in the half motor thing when I was writing and made a mistake.

Thanks Chuck for proof reading my post about use of a half motor stick.
by calgoddard
September 26th, 2019, 7:52 am
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 564
Views: 38399

Re: Wright Stuff C

lechassin - Don't add clay ballast to your airplane when you fly it with a half rubber motor to make up for the removal of rubber motor weight. You need to make a half motor stick and use that instead of clay ballast. Say you want to test how your airplane will fly with a 2 gram rubber motor and mak...
by calgoddard
September 25th, 2019, 12:27 pm
Forum: Wright Stuff C
Topic: Wright Stuff C
Replies: 564
Views: 38399

Re: Wright Stuff C

You can wind a rubber motor to a given “max” torque, and then back off to a predetermined launch torque that will get your airplane just below the highest obstruction when it has reached its peak altitude. In the indoor free flight community this is called a “no touch” flight which is often preferre...

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