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by DoctaDave
January 31st, 2018, 9:36 pm
Forum: Helicopters C
Topic: Best Times
Replies: 100
Views: 10497

Re: Best Times

I see reference to Stephens Lobby for the GGSO flying site but can't see where they posted the ceiling height. Also, was the ceiling clean and valuable? Thanks, Brian T. Ceiling height was approximately 15 ft, the ceiling was nothing special but it was mostly clear of obstructions. Many teams at GG...
by DoctaDave
January 29th, 2018, 6:46 pm
Forum: Helicopters C
Topic: Best Times
Replies: 100
Views: 10497

Re: Best Times

Anyone know of the winning time at GGSO?
Winning time was 2:55, Chinook. Second place was very close at 2:51.
by DoctaDave
January 10th, 2018, 9:00 pm
Forum: Helicopters C
Topic: Helicopters C
Replies: 244
Views: 45428

Re: Helicopters C

This is going to sound crazy, but any advice on hand cranking? Anyone have any tips or know how to build a winder? I don't think I will have one by the time regionals comes around, although I am doing my best to try and get my hands on one. You can make one out of lego gears and brackets. I believe...
by DoctaDave
December 30th, 2017, 5:38 pm
Forum: Helicopters C
Topic: Freedom Flight Kit
Replies: 78
Views: 10294

Re: Freedom Flight Kit

Approximately how many winds should the rubber & motor stick be able to take, maximum? Let's say with a 1g motor of the thin rubber in the FFM kit. There's a handy break point equation out there: break point = 42.2 * L * sqrt(L/W) L = length in inches (EDIT: length of the loop when tied), W = weigh...
by DoctaDave
December 11th, 2017, 11:06 pm
Forum: Towers B/C
Topic: Types of Glues
Replies: 6
Views: 1026

Re: Types of Glues

In almost every scenario, CA glue is the best (though specific thicknesses of CA glue work differently). The only situation I can think of where something else has been used successfully is in Boomilever, where some competitors used gorilla glue to attach the tension piece at the top, since gorilla...
by DoctaDave
October 4th, 2017, 12:59 am
Forum: Mousetrap Vehicle C
Topic: Mousetrap Vehicle C
Replies: 602
Views: 71357

Re: Mousetrap Vehicle C

Let's get this thread rolling again... What sized axles are people using? I've been using 1/4in, but I'm considering moving down to save weight. Also, has anyone found light threaded rods that don't bend a lot? I like to use 1/4" carbon fiber rods. They are incredibly light and strong. Is it possib...
by DoctaDave
October 4th, 2017, 12:58 am
Forum: Helicopters C
Topic: Helicopters C
Replies: 244
Views: 45428

Re: Helicopters C

I noticed wardsci posted a kit. Anybody have any idea what it's like/whether it's worth getting?
Ward science kits are never competitive and are always overpriced. Dave's kits are much better in quality and will build much better helicopters.
by DoctaDave
September 21st, 2017, 12:54 am
Forum: Helicopters C
Topic: Carbon Fiber VS Wooden Spars
Replies: 11
Views: 1875

Re: Carbon Fiber VS Wooden Spars

So FFM last year introduced CF officially in their kits. However, with testing, it seemed that while CF provided better airflow and cut the drag better, it was very susceptible to instability and tipping sometimes. In regards to the bonus this year, I would like to ask the Helicopters forum how the...
by DoctaDave
September 7th, 2017, 1:36 pm
Forum: Helicopters C
Topic: Helicopters C
Replies: 244
Views: 45428

Re: Helicopters C

Since a chinook design would have two rubber motors, it would seem that you would almost certainly forego the 5% bonus on prep time, but trading for a 2.5X kicker, probably worth it. Perhaps both team members need to wind in tandem! Any thoughts as to when they start the pre-flight timing? Will the...
by DoctaDave
May 21st, 2017, 8:29 am
Forum: Helicopters C
Topic: Helicopter Flight Times
Replies: 105
Views: 15337

Re: Helicopter Flight Times

Anyone know the national winning time? I know 5th was 2:21
I believe it was 2:38 and no bonus as far as I know. I just heard the time from someone else so I'm not sure it's correct.

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