Thrust-O-Meter
07-25-2007, 11:55 PM
#6
Join Date: Oct 2002
Location: Chilliwack, BC, CANADA
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RE: Thrust-O-Meter
I'm not seeing a cylinder on that crankcase. Is something missing or do we need to ban you to the nether reagions of electron flyers?
Nice work, Took me a moment to figure out the logic of how it works but then I saw how the 90 brackets worked. Ingenious I say, ingenious. No worries about motor weight or other issues yet friction is reduced to a mere pittance.
Nice work, Took me a moment to figure out the logic of how it works but then I saw how the 90 brackets worked. Ingenious I say, ingenious. No worries about motor weight or other issues yet friction is reduced to a mere pittance.
07-26-2007, 12:19 AM
#7
RE: Thrust-O-Meter
burtcs .... I will post a drawing for all.
rainedave .....How much will the TT07 Tractor Pull? This could be a new event... Model Nitro Tractor Pulls. Chevy would want to use a PAW deisel though.
chevy43 .... Could have a baffle/bulkhead at the front post. It would oil the wheel, even less friction. Wrap the scale in a veggie poy bag.
combatpigg .... Try Craigs List. Surprising what you can get there... and no fees.
BMatthews....Don't worry Bruce ... If I pan the camera there are plenty of (Cox) cylinders on the shelves behind.
I am one of the first on the list to get a New Cox Playboy with the Plastic .010. You know what I am going to do with it.
rainedave .....How much will the TT07 Tractor Pull? This could be a new event... Model Nitro Tractor Pulls. Chevy would want to use a PAW deisel though.
chevy43 .... Could have a baffle/bulkhead at the front post. It would oil the wheel, even less friction. Wrap the scale in a veggie poy bag.
combatpigg .... Try Craigs List. Surprising what you can get there... and no fees.
BMatthews....Don't worry Bruce ... If I pan the camera there are plenty of (Cox) cylinders on the shelves behind.
I am one of the first on the list to get a New Cox Playboy with the Plastic .010. You know what I am going to do with it.
07-26-2007, 03:07 AM
#8
Join Date: Jul 2005
Location: Upper HuttWellington, NEW ZEALAND
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RE: Thrust-O-Meter
I think the UK's Mike Billington (occasionally did engine tests for 'Flying Models') beat you to the draw 20+ years ago, combatpigg-there was a photo of his small engine dyno in the Nov 1984 Aeromodeller-with rather appropriately-a PAW 100 under test. [0.12BHP @ 18,200rpm-only slightly less than a TD 049 on 30% nitro] Photo shows a similar setup, but with the actuator arm and frame coming up from below the scales to bear on the pan, reading torque values., the engine and torque rig being mounted on a frame below the scales.
'ffkiwi'
'ffkiwi'
07-26-2007, 11:24 PM
#10
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RE: Thrust-O-Meter
Skaliwag:
Yours looks a lot better than the one I built about 15 years ago when I was doing some Cobalt 40 thrust to power measurements with a Turbax I Fan. Took a lot of data and tried several tailpipe diameters. But received "no joy" - could not attain the 3.5-4 lbs of thrust I figured I needed for the U-2C jet project I was looking at.[
] Still have the scratch built fuselage laying around here and another fan and a OS .25VF. Need to get back to that plane one of these days.
Anyway, I do like your thrust meter!
Yours looks a lot better than the one I built about 15 years ago when I was doing some Cobalt 40 thrust to power measurements with a Turbax I Fan. Took a lot of data and tried several tailpipe diameters. But received "no joy" - could not attain the 3.5-4 lbs of thrust I figured I needed for the U-2C jet project I was looking at.[
] Still have the scratch built fuselage laying around here and another fan and a OS .25VF. Need to get back to that plane one of these days.Anyway, I do like your thrust meter!
