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Old Oct 12, 2004, 06:55 PM
bradm is offline
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Yet another thing that can go wrong on a Slow Stick


I've read some threads on how some people bend the fuse to adjust for thrust angle. It seemed pretty simple and has worked great for quite some time. I had been using a 2 cell 2100 Li-Poly and the Aiptek SD.

I just switched to 3 cell 1500 Li-Poly and the Nikon 3700. Up it went for some test flights with the new camera mount I just built. I tooled it around the sky and did a few landings to adjust the camera (experimenting) and then back up for more.

On about the 5th time up it just snapped over backwards. I cut the throttle quick as it just acted weird. I thought perhaps there was an elevator problem and babied it back down w/o power.

Well, here's what happened. Nikon and everything else is safe. It didn't even twist the wires that much.
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Old Oct 12, 2004, 07:01 PM
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I did get some good shots, though. Some of them were with thick cloud cover before the sun peeked through. The last one is a ground shot.

bradm
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Old Oct 12, 2004, 07:10 PM
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That's why I always cut a thrust plug!
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Old Oct 12, 2004, 07:55 PM
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Yep, that's what I used to have on a prior plane then I read of others just bending the fuse. If I read it and did it, others here may have as well.

I almost have mine put back together now.
Old Oct 12, 2004, 08:42 PM
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Wow!
Glad you got it down ok.

Nice pictures too!
Old Oct 12, 2004, 08:47 PM
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I bend mine as well, but not before inserting a 1' piece of 2213 arrowshaft. The latest SS fuses have seemed very "buttery" to me compared to my old one.
Old Oct 12, 2004, 10:01 PM
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Glad you got everything back. Had a similar problem once when I had only pushed on the gearbox to the fuse. Strangely enough it pulled off, but still had full control so just glided it back in - Nikon 3700 and all. My wires were *very* twisted...

The Nikon has a bad habit of over exposing. Try setting the exposure down -0.7. There is the added benifit of getting higher shutter speed by doing this. Also, using sports mode also holds the ASA at 100 (by default it uses 50ASA).

-Grant
Old Oct 12, 2004, 10:23 PM
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Quote:
The Nikon has a bad habit of over exposing. Try setting the exposure down -0.7. There is the added benifit of getting higher shutter speed by doing this. Also, using sports mode also holds the ASA at 100 (by default it uses 50ASA).
This is good to know. Thank you very much Grant.
Old Oct 12, 2004, 10:37 PM
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Guess you had a kink in the fuse - bad nuse...

I bend mine with a gently curved 2x4 in a vise. No kinking, and it's worked great with every power system I've used including the insane PJS800+tanic 3S. Does not compromise the fuse strength.

Glad you got her back down in one (well, two) pieces.

I sure hope they aren't using thinner alum in the newer slow sticks...

https://www.rcgroups.com/forums/show...highlight=vise
Old Oct 12, 2004, 10:44 PM
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I use a basswood or balsa insert in the fuse from the nose to 3" behind the rear wing mount. The fuse doesn't deform even when dorked.

--Bill
Old Oct 12, 2004, 10:56 PM
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Bill - I've gotten to where I do the same.

I insert a square spruce dowel about half the length of the fuse. This allows me to screw my motor mount, battery mount and camera mount directly into the fuse and it's super strong.
Old Oct 12, 2004, 11:02 PM
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Quote:
Originally Posted by Steve Nolan (eBird)
Bill - I've gotten to where I do the same.

I insert a square spruce dowel about half the length of the fuse. This allows me to screw my motor mount, battery mount and camera mount directly into the fuse and it's super strong.
I do the same and at 36.3oz that's about as heavy as I want to get!
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Old Oct 13, 2004, 08:32 AM
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This is overkill, but I use the Borden polyurethane glue to secure the fuse insert. This is the glue that foams slightly when it cures so the fuse insert does not have to be a perfect fit. I extend the insert to behind the rear wing mount-- this area has a large bending moment in a hard landing and would seem to be prone the crimping in a hard landing. And yes, the wood gives a better grip for screws than the aluminum.

--Bill
Old Oct 13, 2004, 10:40 AM
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I bend mine, too, but I wrap it with fiberglass cloth and paint it with 30 min epoxy after its done.

No problems so far, but those are disturbing pictures. I may have to re-think bending the next one.

Is there any chance that in bending it, you bent it too far, and then bent it back?

I'm wondering if there was a tiny crack anywhere after bending it. Metal fatigue seems to occur rapidly in aluminum (I'm sure some of the engineer types out there can explain this better than me). I had an aluminum wing joiner rod in a glow plane (Sig Something Extra) that bent slightly after I tried to land below the runway.

I put a dowel in the bent tube and bent it back straight, and then went on flying. It failed about five or six flights later from metal fatigue at the bend.
Old Oct 13, 2004, 10:53 AM
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Brad,
You got real lucky! I had a mount give way on my first Video wing... I was way high to see what happened... Long story short, the wires got twisted and cut on my little 2025-4200.... Glad it didnt brake completly off.... That loss of weight on the nose could have been a disaster!

Myron


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