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Author Topic: DTs  (Read 954 times)
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Steven Wrigley
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DTs
« on: November 08, 2011, 08:50:18 PM »

HELP! Im going to the Inlgeside Md contest this weekend and I dont have a dt for my Square Eagle! (or embryo for that matter!) I neeeed suggestions! I did have a rotary damper on it but that was sporadic at best.
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gossie
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« Reply #1 on: November 08, 2011, 09:13:29 PM »

Maybe a bit more pull from a stronger band might help you DT damper?Huh?    That's what I did to make mine work okay on the P30.
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Steven Wrigley
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« Reply #2 on: November 08, 2011, 09:25:43 PM »

It just seems like no matter what I do it always runs to fast. One time it ran for 2 minutes and another for 15 seconds. I changed nothing between those runs. I got the damper out of a old stereos tape deck.
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spacerod
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« Reply #3 on: November 08, 2011, 09:51:52 PM »

Steven
 I just saw your post here or I could have responded in my e-mail.
I'm not familiar with your damper but for a guick fix I'd go to a fuse DT
on your P-30. If I remember correctly the snuffer tube location and
fuse set up is shown on the plans. Simple but effective.

Charlie Coeyman
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Tmat
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« Reply #4 on: November 08, 2011, 10:35:24 PM »

What are you pulling it with?
The best tension device is a coil tension spring wound from 0.008" to 0.009" wire (guitar strings work well). For a P-30 (or other rubber models) a "Mousetrap" or tension reducer is usually used. It's a wire in a brass tube that the DT line attaches to on one end, and the DT tension spring attaches to the other end to reduce the leverage. There are some pictures here on the P-30 section I believe.

Tony
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Steven Wrigley
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« Reply #5 on: November 09, 2011, 06:27:11 PM »

I was using a loop of 1/16 rubber. That was prolly too big. I may be able to get that small of wire but how big a piece of rubber should I use? Ill do some more fiddling tonight
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danberry
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« Reply #6 on: November 09, 2011, 09:30:54 PM »

A single strand of 1/16" rubber might work better. The spring is the best idea. Your time frame is pushing towards using a fuse.
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Steven Wrigley
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« Reply #7 on: November 10, 2011, 06:15:05 PM »

Yeah about the fuse... The only fuse I have came with my square eagle kit. And Ill be taking 3 planes to Ingleside. Maybe I could borrow some the day of the contest.... Argh Im never prepared! The good news is the rotary damper is way more consistent now.
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« Reply #8 on: November 10, 2011, 07:22:45 PM »

Don't forget that those rotary dampers are somewhat temp dependant.  They'll run LOTS slower when cold.  Re-calibrate in the morning and whenever you note that the temp has changed noticeably.
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« Reply #9 on: November 10, 2011, 07:27:59 PM »

I've used a single strand of 1/16" round rubber (Pole elastic) and it was a bit strong imo. A single strand of .045" to 0.050" is better, but a single strand of 1/16" can work if you make it slightly longer to reduce the tension.


Tony
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crashcaley
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« Reply #10 on: November 10, 2011, 08:40:31 PM »

Steven,  It sure looks like your best bet is the burning fuse one.  I'm sure others at the event will gladly provide you with enough to get you by.  Hope you have loads of fun.  Caley
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spacerod
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« Reply #11 on: November 10, 2011, 09:24:11 PM »

Steven
 My intentions are to try to make it to Ingleside. I'll bring some fuse for you
and also some 10 gm. motors and a crokket hook. How are fixed for rubber lube?
We start flying at Hershey tomorrow.
Charlie Coeyman
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Steven Wrigley
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« Reply #12 on: November 10, 2011, 09:55:22 PM »

Awesome! Im looking forward to seeing you! Thanks a million for the fuse. Hopefully you wont beat me too bad in p-30 Smiley I have plenty of lube. About 3/4 of a can of STP Son of a Gun left.
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jswain
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« Reply #13 on: November 11, 2011, 04:44:28 PM »

HELP! Im going to the Inlgeside Md contest this weekend and I dont have a dt for my Square Eagle! (or embryo for that matter!) I neeeed suggestions! I did have a rotary damper on it but that was sporadic at best.

Hi Steven, Its a little late in the game for my answer but here are two sources i have used .

The stevens aero timer is a no brainer to assemble and works perfectly , my favorite -

http://www.stevensaero.com/StevensAero-Free-Flight-Badge-Button-DT-de-thermalizer-timer-kit.-BONUS-BOMB-DROP-MECHANISM-SA-TIMER01-p-18967.html

the A2Z timer is a bit more work to install and adjust  but is smaller and  reliable , imho better for catapaults and DLG's -

http://www.a2zcorp.us/store/ProductDetailNP.asp?Cguid={CDA3B243-CDBB-451D-A117-3FA0C75C5B56}&ProductID=4396

john
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spacerod
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« Reply #14 on: November 11, 2011, 08:36:06 PM »

Steven
 Don't worry about me beating you in P-30. I don't fly in competiton any more.
Looking forward to seeing you.

Charlie Coeyman
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