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Engine Thrust stand
I am now developing an engine thrust stand with a digital readout for engines from .25 glow to 300cc gas engines and even Turbines.
I am developing this for myself, but am wondering if there is also an interest for this. It will be practically frictionless. Let me know your thoughts on this and what you would like as a package should this go forward. Roger |
RE: Engine Thrust stand
Hey Rog,
Not a bad idea, but I would think that to be accurate, there would have to be one for for say 3 or 4 different ranges of engines......to create the best accuracy. I just don't think that a test stand that works for a glow engine would be accurate on a 50 cc or 100cc or 150 cc engine |
RE: Engine Thrust stand
I made my own thrust stand for small electric motors - simple and easy to use and includes a Whattmeter so that direct power input to thrust can be easly compared as it goes.
Basically using a right angle arm of equal length - the force reads directly onto a gram scale - very simple and accurate. and cheap to make. For big stuff - as you know, there are lots of ways to do it - The right angle arm has NO moving parts --the arm simply pivots force applied to say 12"-- from pivot - will be exactly the same on the right angle arm of the same length. If I was to make one for my 200 cc stuff-- I would use a A frame made from rectangular steel sections (cheap ) and add a right angle arm -of the same stuff -triangulated for torqueing resistance. the scale could be whatever - heck -an old feed store scale would work just fine . (Pass me a bag of oats, Earle.) Or ---- hi tech it - |
RE: Engine Thrust stand
Well, you could be right,
But here is how I can get away with this. The slide is frictionless using the best linear bearings. The scale used is a very accurate digital scale that will have two different setups, one direct for the smaller and the other setup is with a doubler for the scale. Of course I will not offer any of these unless I am completely satisfied that it does the job. It is not going to be cheap either, but like I said, I am doing it for me first. I'll post pictures once I have something to post. I have started with some mock up and once satisfied, it will be all machined aluminum with 1" solid steel sliding shafts. Anyway, will see. I want to be able to test my ZDZ 210 and the coming the Seidel 7 cylinder 180cc engine. That should be interesting. Roger |
RE: Engine Thrust stand
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here is a pic of the lil electric one - a big one is easy for any welder to make
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RE: Engine Thrust stand
ORIGINAL: dick Hanson I made my own thrust stand for small electric motors - simple and easy to use and includes a Whattmeter so that direct power input to thrust can be easly compared as it goes. Basically using a right angle arm of equal length - the force reads directly onto a gram scale - very simple and accurate. and cheap to make. For big stuff - as you know, there are lots of ways to do it - The right angle arm has NO moving parts --the arm simply pivots force applied to say 12"-- from pivot - will be exactly the same on the right angle arm of the same length. If I was to make one for my 200 cc stuff-- I would use a A frame made from rectangular steel sections (cheap ) and add a right angle arm -of the same stuff -triangulated for torqueing resistance. the scale could be whatever - heck -an old feed store scale would work just fine . (Pass me a bag of oats, Earle.) Or ---- hi tech it - But mine will be a little more hi tech for one reason, I want all in one even turbines. Roger |
RE: Engine Thrust stand
give it a shot!
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RE: Engine Thrust stand
Looking forward for your approval Dick:D
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RE: Engine Thrust stand
I don't have an approval dick.
However - I am sure you will get it to work nicely ! |
RE: Engine Thrust stand
ORIGINAL: dick Hanson I don't have an approval dick. However - I am sure you will get it to work nicely ! |
RE: Engine Thrust stand
A little update on the pull test stand.
Most of the parts are made ( a lot of machining). Need to get some plates on Monday and will see about the whole thing. At this point, I don't think I will be offering this for sale. It will cost too much (don't ask) But I will be able to do some serious test with it. A few guys are going to come up with there engine setup and do the test here. So will see. Pictures are coming next week hopefully. Roger |
RE: Engine Thrust stand
I've often considered building one of these myself.
My idea was to use a couple of ball bearing drawer slides and build a simple rolling platform to bolt the engine mount on. Then use a digital fish scale. I'd build in a locking mechanism for starting and adjustments, then have a release allowing only limited movement (matching the linear distance spec. of the scale) to safely take the thrust measurements. |
RE: Engine Thrust stand
ORIGINAL: Barry_G I've often considered building one of these myself. My idea was to use a couple of ball bearing drawer slides and build a simple rolling platform to bolt the engine mount on. Then use a digital fish scale. I'd build in a locking mechanism for starting and adjustments, then have a release allowing only limited movement (matching the linear distance spec. of the scale) to safely take the thrust measurements. I'll post pictures this afternoon of the mock up Roger |
RE: Engine Thrust stand
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Here are some pictures of the mock up only. Still a lot of work.
The two ptalform you see here are press wood and only mock up. The final unit will be of aluminum plates. The linear bearing and rod are of 1" dia. |
RE: Engine Thrust stand
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one last one
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RE: Engine Thrust stand
Very cool. If you were to make it public, how much do you think it would cost roughly?
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RE: Engine Thrust stand
ORIGINAL: shortman Very cool. If you were to make it public, how much do you think it would cost roughly? Once finished you will see better what I mean. It would be over $1000.00 CDN, so you know why I don't think it will go to market, but I wanted one for testing the Seidel line of engines and my ZDZ 210 for some coming projects. Roger |
RE: Engine Thrust stand
Wow, that must be the daddy of all test stands! Good luck with it.
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RE: Engine Thrust stand
ORIGINAL: shortman Wow, that must be the daddy of all test stands! Good luck with it. Yep Roger |
RE: Engine Thrust stand
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Here are some update photos
The last photo is showing a different mounting plate. Roger |
RE: Engine Thrust stand
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Here more photos, Now I need to finish up with the ignition battery/switch, fuel tank/filler, and throttle management.
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