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Gasser Model RC Helicopters > Align Gas Conversion fever
 
 
Fixit
Elite Veteran
Location: UK

My Posts This: Topic  Forum

Thanks Juan, but it’s just in the mock build state and not the final build, look at the block bolts; nothing is nipped up or finished yet but everything will be triple checked before it fly’s.

I only like to fly gassed up
06-25-2009 07:48 PM
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AceBird
Elite Veteran
Location: Utica, NY USA

My Posts This: Topic  Forum
Quote 
I did use green loctite Ace but the sleeve was a tight fit, I’ve also fit two grub screws in the neck to help hold the sleeve in place.

Well, then all the loc-tite did was make a mess. You need at least a ½ thou film all around the surface area for it to work. You would think that if you press fit something and also add loc-tite to it the joint would be stronger but it doesn’t work that way. It's one method or the other.
If you are going to choose the press fit method then you actually want a sweat fit or shrink fit (.002 interference or more) for this particular application. If you distort the bell in any way shape or form trying to press in the shaft the assembly is toast. Heat the bell housing up, drop it on the shaft that is held vertical and when it is cool it is locked for good.

Ace
What could be more fun?
06-25-2009 09:09 PM
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JuanRodriguez
Elite Veteran
Location: Rochester, New York

My Posts This: Topic  Forum
Quote 
look at the block bolts; nothing is nipped up or finished yet

Yup, I did notice that...... just wanted to make sure nothing fell through the cracks....
06-25-2009 09:12 PM
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Fixit
Elite Veteran
Location: UK

My Posts This: Topic  Forum		Ace
Thanks for explaining the correct way to use loctite and the press fitting, I always thought the tighter the better but it makes sense if there’s no room for the liquid it cant do its job.
When I press fit the sleeve I insert a shoe then press it in the vice taking great care not to distort or damage the bell and touch wood I haven’t damaged on yet.
Cheers
Fixit

I only like to fly gassed up
06-25-2009 10:21 PM
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Fixit
Elite Veteran
Location: UK

My Posts This: Topic  Forum
Quote 
Yup, I did notice that...... just wanted to make sure nothing fell through the cracks....

No worries, I could have missed it and you would have saved the day.

I only like to fly gassed up
06-25-2009 10:23 PM
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smallplanes
Key Veteran
Location: Timmonsville,S.C. ,USA

My Posts This: Topic  Forum		That sounds like a good idea. At work i made some 2" SS shafts and i made some 1/4 washer rings we would put the ring on a turkey cooker and get them red hot then with a pair of pliers we would slide it on the shaft very fast where we needed it and when it cooled down you could not beat it of with a big hammer i know i tried. We did not even use locktitie. I don't know how aluminum would due under that kind of heat.

Spectra G 26cc
Jewel
2 Evo 50's
3 Trex 450's
Trex 700
Raptor50
12Z
06-25-2009 10:29 PM
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smallplanes
Key Veteran
Location: Timmonsville,S.C. ,USA

My Posts This: Topic  Forum		It must work good because they went to oil rigs in the ocean.

Spectra G 26cc
Jewel
2 Evo 50's
3 Trex 450's
Trex 700
Raptor50
12Z
06-25-2009 10:32 PM
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Fixit
Elite Veteran
Location: UK

My Posts This: Topic  Forum
Quote 
It must work good because they went to oil rigs in the ocean.
Maybe the rust has taken over now

I think alloy would fall apart at that kind of heat, what about warming the bell and freezing the sleeve

I only like to fly gassed up
06-25-2009 11:23 PM
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neale
Senior Heliman
Location: BRISBANE ,Australia

My Posts This: Topic  Forum		I am just checking out your frames at the moment,nice job

Have money pit,but small shovel !!
06-25-2009 11:29 PM
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neale
Senior Heliman
Location: BRISBANE ,Australia

My Posts This: Topic  Forum		PeterI see you have seen youve moved the tail servo to the boom,any reason,could you not use the tal servo mount for the throttle?

EDIT: Disregard last question,I just realized the throw it would have!!

Have money pit,but small shovel !!
06-25-2009 11:40 PM
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smallplanes
Key Veteran
Location: Timmonsville,S.C. ,USA

My Posts This: Topic  Forum		Both pieces where made from SS we had a sleave that would put the ring in the same place everytime and if you did not do it in i hurry it would cool in the wrong place and we would have to throw the shaft away. You could not beat it to where o wanted it as soon as it looked down that was it. we even tried to cut thur the ring to the shaft on bad ones and we still could could not move it. We made some out out of of monel and that stuff was like $28000 for 5 bars of 2.5". Luckily we had no bad on. I think if you heat it and pput it together it will hold.
I'm not sure you need the locktite.


Hope it works, try it on an old one

Spectra G 26cc
Jewel
2 Evo 50's
3 Trex 450's
Trex 700
Raptor50
12Z
06-25-2009 11:54 PM
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Fixit
Elite Veteran
Location: UK

My Posts This: Topic  Forum
Quote 
Hope it works, try it on an old one

Good idea I will do that seen as I have a tin full

I only like to fly gassed up
06-26-2009 12:24 AM
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neale
Senior Heliman
Location: BRISBANE ,Australia

My Posts This: Topic  Forum		Peter any reason you moved the throttlefrom the rear,I likit at the rear and I was wondering if it is a prob? Also you moved the tail servo to the boom?
Neal

Have money pit,but small shovel !!
06-26-2009 12:28 AM
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Fixit
Elite Veteran
Location: UK

My Posts This: Topic  Forum		Neal
I don’t like all the links on the frame mounted servo plus the servo on the boom is like a weight on a scale, move it one way or the other for tuning the CG

Pay attention to the elevator servo position if you decide to move it Neal, too low or to far back and the arm bottoms out on the boom mount, too high and the link rod binds on the underside of the top bearing block

Just one more snag I found with my conversion and that is the HT lead is to short so I will have to re-sight the coil on the base plate, good job I left the base on the big side till the end or I would have to make another

I only like to fly gassed up
06-26-2009 12:34 AM
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Fixit
Elite Veteran
Location: UK

My Posts This: Topic  Forum
Quote 
any reason you moved the throttlefrom the rear

I like the servo at the rear also but because I changed to the 700 tank it would weaken the frame putting it there and I now had the option of using the receiver try so I went down that road.

I only like to fly gassed up
06-26-2009 12:39 AM
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Fixit
Elite Veteran
Location: UK

My Posts This: Topic  Forum		Neal did you realize what you said in your last post

Quote 
I likit at the rear


Good job you didn’t do a typo and put up instead of at

I only like to fly gassed up
06-26-2009 12:43 AM
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AceBird
Elite Veteran
Location: Utica, NY USA

My Posts This: Topic  Forum
Quote 
I don't know how aluminum would due under that kind of heat.

Aluminum on steel works even better because aluminum expands more than steel so you can get a greater interference fit. dissimilar metals also have the advantage of removal with heat where as in your case (stainless to stainless) the metals expand the same. However, in many cases with hubs or sleeves on shafts you encase the shaft with dry ice or liquid nitrogen to draw down the shaft while heating the hub or dunking in very hot oil. It is either going to fall off or not only using gravity as the pulling force.

If the materials are not hardened to begin with there is nothing lost by heating as long as you don't get close to the melting point.

Ace
What could be more fun?
06-26-2009 01:25 AM
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zorba
Senior Heliman
Location: Montreal, Quebec, Canada

My Posts This: Topic  Forum		I see you back at it Peter. Nice job on the frames.
I finally finished my canopy. After three tries she looks good.
I am waiting for the machinist to finish my shaft then back on the field before my holidays run out.

Cheers


Never too old to learn...and never too young to do it again. And the ground always wins..
06-26-2009 02:21 AM
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neale
Senior Heliman
Location: BRISBANE ,Australia

My Posts This: Topic  Forum		Ha ha ha ha ha ha ha,I did not pick up on what I had typed!

Have money pit,but small shovel !!
06-26-2009 02:25 AM
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neale
Senior Heliman
Location: BRISBANE ,Australia

My Posts This: Topic  Forum		can you let us know where your cg ends up ?

Have money pit,but small shovel !!
06-26-2009 03:23 AM
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Gasser Model RC Helicopters > Align Gas Conversion fever
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