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Cox Engine of The Month
August-2024
balogh's
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"Cox TD09 R/C Beast of Burden featuring Kamtechnik head and DIY metallic fuel nipple"
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balogh's
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"Cox TD09 R/C Beast of Burden featuring Kamtechnik head and DIY metallic fuel nipple"
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PAST WINNERS
Testing model engine power output question
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Testing model engine power output question
To my knowledge there is no such thing as a model engine dynomometer.
I've used them to tune full-size outboard motors and cars but what of model engines?
SD
I've used them to tune full-size outboard motors and cars but what of model engines?
![Huh...](/users/3015/29/34/60/smiles/3929217648.gif)
![Huh...](/users/3015/29/34/60/smiles/3929217648.gif)
![Huh...](/users/3015/29/34/60/smiles/3929217648.gif)
SD
SuperDave- Rest In Peace
- Posts : 3552
Join date : 2011-08-13
Location : Washington (state)
Re: Testing model engine power output question
Hey Dave, I started a thread on this awhile back... check it out. It's still been on my mind, to test a design that I've been thinking about.
https://www.coxengineforum.com/t5779-engine-thrust-meter?highlight=thrust+meter
https://www.coxengineforum.com/t5779-engine-thrust-meter?highlight=thrust+meter
Re: Testing model engine power output question
Good on you Roddie! Isn't it wonderful to have an inquisitive mind?
Too many believe that power is best measured by RPM. Not so IMO.
Mention torque and many will ask: "What?" Hmmmm........
On large (150hp and larger) outboards I used a hyrdraulic dyno attached to the prop shaft. It consisted of an adjustable hydraulic pump. The output pressure of the pump could be adjusted simulating RPM and loading light to heavy. This is helpful in propeller selection.
If a similar dyno device could be adapated to model engines some interesting revealations would result and myths disproven.
SD
Too many believe that power is best measured by RPM. Not so IMO.
Mention torque and many will ask: "What?" Hmmmm........
On large (150hp and larger) outboards I used a hyrdraulic dyno attached to the prop shaft. It consisted of an adjustable hydraulic pump. The output pressure of the pump could be adjusted simulating RPM and loading light to heavy. This is helpful in propeller selection.
If a similar dyno device could be adapated to model engines some interesting revealations would result and myths disproven.
SD
SuperDave- Rest In Peace
- Posts : 3552
Join date : 2011-08-13
Location : Washington (state)
Re: Testing model engine power output question
SD,
Remember Horsepower is measured by RPM x torque ( HP=(RPM * T) / 5252) you gotta have both, but if two engines have the same amount of torque and one turns more RPM, then that engine is going to have more power or horsepower.
Remember Horsepower is measured by RPM x torque ( HP=(RPM * T) / 5252) you gotta have both, but if two engines have the same amount of torque and one turns more RPM, then that engine is going to have more power or horsepower.
Re: Testing model engine power output question
Well Dave, to me; it's the challenge of building a very useful performance tuning tool... especially where there aren't any generally available. The toughest part is accurate calibration, and building a device that will accept different engines/mounting styles. The new digital fishing scales have great possibilities, along with a floating fixture for mounting the engine. A small shallow "water-tub" to float the fixture, with hooks for holding the scale would be "friction-free" (important with sm. less powerful motors) and give direct/accurate pull-measurements.SuperDave wrote:Good on you Roddie! Isn't it wonderful to have an inquisitive mind?
Too many believe that power is best measured by RPM. Not so IMO.
Mention torque and many will ask: "What?" Hmmmm........
On large (150hp and larger) outboards I used a hyrdraulic dyno attached to the prop shaft. It consisted of an adjustable hydraulic pump. The output pressure of the pump could be adjusted simulating RPM and loading light to heavy. This is helpful in propeller selection.
If a similar dyno device could be adapated to model engines some interesting revealations would result and myths disproven.
SD
![-](https://2img.net/i/empty.gif)
» 010 power output
» TeeDee 049 real power output?
» Engine output variation with ambient temperature
» "Boomer" model for Thermal Hopper power
» Roddie's combat model for reed power.
» TeeDee 049 real power output?
» Engine output variation with ambient temperature
» "Boomer" model for Thermal Hopper power
» Roddie's combat model for reed power.
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