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Die-cast Crank Case on a stunt tank... issue

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Re: Die-cast Crank Case on a stunt tank... issue

Post  marcel85 on Mon Jan 28, 2013 2:28 am

maybe you can try to sand the back of the crankcase on a flat surface, on a fine grit sandpaper to get a smooth an even surface.
and then use a good matching gasket that covers the whole surface.

your crankcase pressure must come by the screws, otherwise there is no possible way for the pressure to come trough
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Re: Die-cast Crank Case on a stunt tank... issue

Post  coxaddicted on Mon Jan 28, 2013 4:03 am

marcel85 wrote:maybe you can try to sand the back of the crankcase on a flat surface, on a fine grit sandpaper to get a smooth an even surface.
and then use a good matching gasket that covers the whole surface.

your crankcase pressure must come by the screws, otherwise there is no possible way for the pressure to come trough

Regarding the flat surface, you could use an old mirror which has a very flat surface.

Regards
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Re: Die-cast Crank Case on a stunt tank... issue

Post  WingingIt74 on Mon Jan 28, 2013 7:39 am

coxaddicted wrote:
marcel85 wrote:maybe you can try to sand the back of the crankcase on a flat surface, on a fine grit sandpaper to get a smooth an even surface.
and then use a good matching gasket that covers the whole surface.

your crankcase pressure must come by the screws, otherwise there is no possible way for the pressure to come trough

Regarding the flat surface, you could use an old mirror which has a very flat surface.

Regards

Same problem with 2 different engines and 3 different tanks?

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Re: Die-cast Crank Case on a stunt tank... issue

Post  marcel85 on Mon Jan 28, 2013 8:24 am

I can't come up with a better plausible idea, but if I find it, it will be posted
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Re: Die-cast Crank Case on a stunt tank... issue

Post  pkrankow on Mon Jan 28, 2013 9:00 am

I thought I took a bunch more pics than this. Apologies for the poor quality camera phone images.


https://i.servimg.com/u/f13/17/84/87/39/beetan10.jpg

The red is anaerobic sealant on the rim. I applied fresh on reassembly. The aluminum pickup went into position really easily on test fits, and stayed in place when I took it apart. I am using tygon tube because I plan to run diesel on this setup after break in, if it performs properly.


https://i.servimg.com/u/f13/17/84/87/39/done10.jpg

assembled, profile.


https://i.servimg.com/u/f13/17/84/87/39/01270310.jpg

Assembled showing my gasket hanging out a little better. I thought I had a picture of the gasket alone but apparently I do not. It is a simple job I made the center hole with an x-acto knife, then used a screw to punch the screw holes supported by the tank, then de-fuzzed as best I could. I then trimmed it more or less square.

I used a manila card stock folder for gasket material. Not the best stuff to use but pretty good.

I don't know what prop is on it right now, it was one I had on my desk so I stuck it on to keep the grey cam for the starter in position.

Phil
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Re: Die-cast Crank Case on a stunt tank... issue

Post  pkrankow on Mon Jan 28, 2013 1:22 pm

Ran fine on 5x4 thimble drome prop, and on the 7x3 free flight prop for ultimately pulling my glider. Ran the tank nearly out all but the first couple runs.

Lets see if I can make youtube work for me...

Phil
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Re: Die-cast Crank Case on a stunt tank... issue

Post  pkrankow on Mon Jan 28, 2013 1:46 pm

http://www.youtube.com/watch?v=5Fl2z0Hu3k0&feature=youtu.be

http://www.youtube.com/watch?v=GP04Ts2mlBw&feature=youtu.be

http://www.youtube.com/watch?v=t99fE6Hrn-M&feature=youtu.be

Apologies for the lousy camera phone videos.

I had no pumping, even if I took the engine board out of the vise and aimed it upwards. I think I will get into the engine one more time and put a different aluminum tube in that hopefully will draw the tank more empty than this setup does.

This is using a hand-cut gasket that exactly fits the tank, and is over sized to the crankcase. I am positive this engine will pull my 2 meter glider skyward very effectively. My only disappointment is the run time, I am getting less than 2 minutes out of the 8cc tank, and there is only 1-2 cc left in it runs out of fuel. The back plate on it has been opened up.

Phil
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Re: Die-cast Crank Case on a stunt tank... issue

Post  WingingIt74 on Tue Jan 29, 2013 7:49 am

Crazy... maybe it's just me LOL

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Re: Die-cast Crank Case on a stunt tank... issue

Post  pkrankow on Tue Jan 29, 2013 9:18 am

I did have some funky kinda results like the oscillating prop. On an engine with a zero drag starter or no starter I think the engine would have started in reverse, so I think it is the cam type starter in my case. I tried to get video of it, but my phone is old and slow.

I also had a whistling or squeaking, almost like a bath toy, during some early start attempts. I know this is the reed failing to seal, or vibrating when air is pulled through it. It stopped after I got the engine to run properly. I suspect that oiling the reed with some castor during assembly might reduce or stop this behavior. However I have engines behave with the squeaking after they have sat a couple weeks...

Phil
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Re: Die-cast Crank Case on a stunt tank... issue

Post  Cox International on Tue Jan 29, 2013 11:04 am

Yes, the squeaking is the Mylar reed vibrating. Once the engin is run it should disappear.
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Re: Die-cast Crank Case on a stunt tank... issue

Post  Cox International on Tue Jan 29, 2013 11:06 am

pkrankow wrote:Weather pending I am ready. DC Diesel bomber with a glow head, hand cut paper gasket, aluminum bee tank, metal back, aluminum pickup with tygon tube (this is going to be running diesel at some point)

I took pictures as I went, too late to upload tonight.. I'll try to get some video with a phone if it works or not. I have never tried posting video before though.

As an aside, I think someone stepped on the package in shipping, the needle was bent and part of the NVA on the back plate is cracked. If this works properly it won't matter since it will stay on this tank to pull my RC glider up.

Phil

Phil,

If theamaged parts originated from us please send an email to support@coxengines.ca and you will be shipped replacements. In our world it is the responsibilty of the seller to deliver merchandise in good order and not the buyer's responsibility.
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Re: Die-cast Crank Case on a stunt tank... issue

Post  PlaidHatter on Sat Jul 18, 2015 11:55 am

Where did this adventure end up? I'm interested in building a motor with a DC crankcase with a stunt tank as well, and willing to put in a little effort as long as it'll actually work well.
Do we have a final summary on what the issue was?
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