Search found 64 matches

by fifty_missions
March 7th, 2020, 3:28 pm
Forum: Elastic Launched Glider B
Topic: Elastic Launched Glider B
Replies: 125
Views: 8692

Re: Elastic Launched Glider B

Let's look at the trim and fix options when a glider has a severe tendency to roll on launch. To begin with, any glider should be symmetric before test flying begins. To orbit and not hit the walls it will eventually have some magnitude of asymmetry. Next, speed has a changing effect on the glider''...
by fifty_missions
March 5th, 2020, 11:09 pm
Forum: Elastic Launched Glider B
Topic: Flight Times
Replies: 9
Views: 869

Re: Flight Times

Two weeks ago one of the NW Indiana Regionals took place at IUNW. The gym's ceiling is about 30' high. The ELG event was won by Thomas Jefferson MS (TJMS) with 3 best flights of 24.00, 21.26 and 23.98. The second place team was less than 20 seconds for their three best flights. TJ is headed to the s...
by fifty_missions
March 24th, 2019, 7:48 pm
Forum: Wright Stuff C
Topic: Stalling and Bad Stability
Replies: 9
Views: 1767

Re: Stalling and Bad Stability

...and testing a few trims, some of them were very inconsistent. For those flights, right after I released it, the plane flew for 1 sec and just stalled and as it's angle of attack approached vertical. This prevented any lift from being generated, and the plane basically fell tail straight down. Wi...
by fifty_missions
March 24th, 2019, 12:44 pm
Forum: Elastic Launched Gliders B
Topic: Elastic Launched Gliders B
Replies: 209
Views: 35217

Re: Elastic Launched Gliders B

Instead of cracking the wing, is it alright to sand the bottom of the leading edge of the wing to give it more lift Nope- not enough change in incidence plus, technically, you are reducing wing area. Crack and reset that wing that drops. MY BET is that you kill two birds with one stone-- it will pr...
by fifty_missions
March 23rd, 2019, 5:32 am
Forum: Elastic Launched Gliders B
Topic: Elastic Launched Gliders B
Replies: 209
Views: 35217

Re: Elastic Launched Gliders B

How would flap deflection be affected if my chord changed from 3" to 3 .75" ? . Keep the trailing edge limit about the same as where it is now. More area means more lift. Added deflection means substantially more drag. This might be okay for a 20' ceiling where a BUNT launch is best but for the mos...
by fifty_missions
March 22nd, 2019, 5:37 pm
Forum: Elastic Launched Gliders B
Topic: Elastic Launched Gliders B
Replies: 209
Views: 35217

Re: Elastic Launched Gliders B

Ok I'll do that. Just wondering, would decreasing the flap deflection on the right wing achieve the same result? No on the deflection. That is a lot of area to change and makes the glider super asymmetric. Both flaps should be equal. That said, there is some suspicion that one flap is flexing more ...
by fifty_missions
March 22nd, 2019, 8:10 am
Forum: Elastic Launched Gliders B
Topic: Elastic Launched Gliders B
Replies: 209
Views: 35217

Re: Elastic Launched Gliders B

1) Ok I'll try that but how do I crack the wing? I'm using a flapper FF design so there's carbon fiber on the wing. Cracking the leading edge won't also break the carbon fiber, will it? It more like break the wing. It is best spot is right at the root where the two wings join. We are talking about ...
by fifty_missions
March 21st, 2019, 3:41 pm
Forum: Elastic Launched Gliders B
Topic: Elastic Launched Gliders B
Replies: 209
Views: 35217

Re: Elastic Launched Gliders B

I'm thinking there may be a mass issue. If your glider weighs over 4 grams, it is consuming too much energy to fly. A good analogy is take a 5 mile hike with loose change and a bottle of water. Take the same hike a week later... loose change, a bottle of water and a 100 pound knapsack. Which of the ...
by fifty_missions
March 20th, 2019, 6:58 pm
Forum: Elastic Launched Gliders B
Topic: Elastic Launched Gliders B
Replies: 209
Views: 35217

Re: Elastic Launched Gliders B

Can anyone reach out to me if they know any ideas on how to help gliders have a smooth transition? Currently, my glider just comes back down immediately without transitioning. Any other tips are welcome. 1) Easiest solution is to get the glider to stall and launch at a 45 degree angle with a bank t...
by fifty_missions
March 19th, 2019, 2:32 pm
Forum: Elastic Launched Gliders B
Topic: Elastic Launched Gliders B
Replies: 209
Views: 35217

Re: Elastic Launched Gliders B

I think it's my flaps that are flexing, but that's what's supposed to happen. My wing right now has no undercamber either, it's just mounted on flat fuselage with no pylon. When you launch does the glider make a slight buzzing sound? If it does, that is FLUTTER. That is Drag to the max and whatever...

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