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E-flite . Next D . Fast Lad Performance

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Audacity Models Pantera 50 - Tiger 50 > Securing Tail Boom Mod.. of sorts..
 
 
darkfa8
Key Veteran
Location: Eatontown, NJ, USA

In the Tiger 50 manual, page 21, section 5.7 it shows the installation of two (one for each side) M3x4mm set screw to be screwed into the plastic boss on the frame.

These are used to pinch/penatrate the boom in conjunction with the other 4 M3 cap screws that clamp the boom in the frame.

To improve on this further, in addendum v1.7, page 44, section 10.4 it is recommended to use M3x10mm allen head cap screws in place of the set screws. This will enable you to exert more force on the screws without stripping them.

- Dan G. -
11-02-2005 Over year old.
HOMEPAGE  
 
 
hootowl
Elite Veteran
Location: Garnet Valley, Pa.

Thanks Dan,

My only concern with this is twofold..

1) Why doesn't the clamping action do the job to start with? Maybe a design tolerance change is in order to allow more compression.


2) Belts stretch. Poking permanent dimples into the boom will make it difficult to tighten the belt further. Also if you need to replace the belt it may not be the same location (boom)

I kinda like the idea of possibly sanding some material off the inside faces of the frame for more compression but with the boom tube walls being so thin I'm not so sure this will work. Has anyone tried this?



Mike

"Any man who says he is an American, but something else also, isn't an American at all.
11-02-2005 Over year old.
HOMEPAGE  
 
 
darkfa8
Key Veteran
Location: Eatontown, NJ, USA

Mike,

In the Addendum v1.7 from Audacity, John does suggest taking a few thousandths off of the frame to increase the clamping ability with no reported ill effects.

I agree with your points. I'd suspect that John has or will implement some sort of design change/modficiation for the next "batch" or version of the Tiger.

When I pulled out the tail boom from my most recent crash, the M3 cap screws had drilled right through the aluminum. This could make for stress crack point? Obviously if you need to readjust belt tension, this can cause several puncture points.

Also make sure your horizontal fin mount is tight on the boom, this also helps keep the boom from sliding.

Do Raptors experience this sort of problem too?

- Dan G. -
11-02-2005 Over year old.
HOMEPAGE  
 
 
doorman
Elite Veteran
Location: E.Berne, NY

Tail Boom

Over the years, I have seen several designs where the tailboom just doesn't want to stay put.... and the cure that I have been using since my first X-cell back in the early 90's is this.... and I do it wether I notice a problem or not, and my booms do not slip....
Take a piece of black electrical tape about 1" long and put one strip on each side of the boom, or on the top and bottom, but do not let it overlap.. then install you tail boom.... as mentioned, I do this on all of my heli's and I have never had a boom slip.... from X-cells to Raptors to Evos.... simple and it works....
And I have not tigthened the set screws on my Tiger yet...and it works just fine... give it a try.... nice simple fix....

Stan

If there is a cure for this, please don't tell me about it!!!
11-03-2005 Over year old.
 
 
hootowl
Elite Veteran
Location: Garnet Valley, Pa.

Quote 
Take a piece of black electrical tape about 1" long and put one strip on each side of the boom, or on the top and bottom, but do not let it overlap.. then install you tail boom.... as mentioned, I do this on all of my heli's and I have never had a boom slip.... from X-cells to Raptors to Evos.... simple and it works....


That's what I'll do and be done with it. Thanks doorman.

And thanks John Beech and the rest of you all for being so responsive. We have to be honest, spell out any issues up front and tackle them. This is a good ship. None are perfect... Just go to the Rappy forum and read of all the problems and fixes over there even after being out for 10 years!

"Any man who says he is an American, but something else also, isn't an American at all.
11-03-2005 Over year old.
HOMEPAGE  
 
 
scoyle
Senior Heliman
Location: Mahomet, IL

Can't recall which half of the chassis but one half has a flat plane that you can run a sanding block over and periodically test fit the boom while gripping both haves by hand until all play/wiggle room in the boom is removed.

When you assemble with the 4 chassis screws and torque them down as John specifies the boom is gripped TIGHT.

I don't yet have any runtime to say vibration or G's will affect this but I can't see where the additional set screws are going to buy me additional security.

--Scott
11-03-2005 Over year old.
HOMEPAGE  
 
 
hootowl
Elite Veteran
Location: Garnet Valley, Pa.

I'm sure it's an issue of manufacturing tolerancing. It's difficult to get tubing manufactured to tight outside diameter tolerancing AND reliably predict plastic shrinkage when designing a mold.... You end up with production variables. That would explain why some are tight and some are not.

I think the mold needs a revision to provide more clamping force. You need full circumfrential contact to avoid crushing the thin walled tube.

"Any man who says he is an American, but something else also, isn't an American at all.
11-03-2005 Over year old.
HOMEPAGE  
 
 
darkfa8
Key Veteran
Location: Eatontown, NJ, USA

ok, just finished the electrical tape mod lol...

this is a new boom with about 15 seconds of hovering on it, I have the M3 cap screws in place of the set-screws and had them run in just slightly. After pulling out the boom, both of these had already punctured the tubing No cracks, yet...

I put the tape on the sides of the boom, and slid in back in. I also noticed that some of the plastic where the four M3 long cap screws go through had buckled a bit and a small crack has developed...most definitely from cranking down a bit more then I should have.

Next time I have the frame halves apart, hopefully not any time soon, I'll block down this section for a tighter fit and I won't be using the set-screw/cap-screw mod anymore.

I also thought that another horizontal fin support clamp or even a aluminum one on the boom, slid all the way upto the back of the frame and snugged down might also work as a stop of sorts.

So, in my humble opinion, the puncturing/dimpling holes into the tail boom would be ok if adjusting the tail belt tension wasn't a issue, but it is.

Also, when and if you pull out the boom, be sure to clean out the passage way in the frames. There's a bit of gunk that accumilates along with some belt dust.

- Dan G. -
11-04-2005 Over year old.
HOMEPAGE  
 
 
hootowl
Elite Veteran
Location: Garnet Valley, Pa.

I never attempted to use the set screws. The boom wall thickness is just too thin. I got the tape in. I think that's the simplest, forgetaboutit answer.

"Any man who says he is an American, but something else also, isn't an American at all.
11-04-2005 Over year old.
HOMEPAGE  
 
 
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Audacity Models Pantera 50 - Tiger 50 > Securing Tail Boom Mod.. of sorts..
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