i´m breaking-in a DA-120 engine using a Zinger 26x12 prop. I measured 4500 rpm at half throttle position, but rpms not goes beyond passing this point. Im using a futaba receptor 4.8V 1000 mAh battery pack for the ignition. Do you have any idea about how to fix the problem? Thanks for your help and congrats for your fine test bench
To calibrate the test stand, I have a ball-bearing pulley and bracket that mounts to the front of the stand, so I can use a precision 25 lb weight to hang from a cord that goes around the pulley so that it exerts exactly 25 lb forward pull on the test stand movable plate. Then I measure the reading several times, average the result and adjust a scalar value in the software to match.
I was looking for test stands which could measure thrust and watching some videos I got to this one and I basically understand the funtioning of it but the part I cant figure out is how do you calibrate the scale or how do you know the reading is "true"
@rodrigo125 Hi Rodrigo, since he hasn't answered you on here I think I might be able to shed some light on it.
X being the horizontal plane and Y being the vertical plane.
If you have both X and Y the same length and have a attachment point at both ends in the same spot, and you put one kilogram of weight on Y then you will have one kilogram of weight at point X also.
Now what you need to do is work out how far down the Y axis you need to go to get say 100 grams instead of one kilogram reading at point X then you just multiply the reading of point X if its 300 grams then times three = 3 kilograms.
How to work out the distance to come down on Y axis is a matter of mathematics.
I got too many missiles thrown at me in maths so not sure on that one lol
@rodrigo125 A way to calibrate it could be to have say fishing line with a loop at one end going over the Y axis and the other end going over a pulley wheel with one kilogram tied to one end, now slide the loop end of the line up and down Y axis till you get 100 grams, that should give you your calibration point for one kilogram converted to 100 gram mark, mark that spot drill a hole and you have your 10 to one conversion point.
I'm starting to make my own brain hurt so ill leave it at that lol
No top comment fricken yessss okay eryyyboddyyy thumbs the frick up!
YoungDub13 1 month ago
i´m breaking-in a DA-120 engine using a Zinger 26x12 prop. I measured 4500 rpm at half throttle position, but rpms not goes beyond passing this point. Im using a futaba receptor 4.8V 1000 mAh battery pack for the ignition. Do you have any idea about how to fix the problem? Thanks for your help and congrats for your fine test bench
loocky44 6 months ago
To calibrate the test stand, I have a ball-bearing pulley and bracket that mounts to the front of the stand, so I can use a precision 25 lb weight to hang from a cord that goes around the pulley so that it exerts exactly 25 lb forward pull on the test stand movable plate. Then I measure the reading several times, average the result and adjust a scalar value in the software to match.
rcsportflyer 11 months ago
Hi!
I was looking for test stands which could measure thrust and watching some videos I got to this one and I basically understand the funtioning of it but the part I cant figure out is how do you calibrate the scale or how do you know the reading is "true"
Thanks!
rodrigo125 1 year ago
@rodrigo125 Hi Rodrigo, since he hasn't answered you on here I think I might be able to shed some light on it.
X being the horizontal plane and Y being the vertical plane.
If you have both X and Y the same length and have a attachment point at both ends in the same spot, and you put one kilogram of weight on Y then you will have one kilogram of weight at point X also.
ShmeareD 1 year ago
Now what you need to do is work out how far down the Y axis you need to go to get say 100 grams instead of one kilogram reading at point X then you just multiply the reading of point X if its 300 grams then times three = 3 kilograms.
How to work out the distance to come down on Y axis is a matter of mathematics.
I got too many missiles thrown at me in maths so not sure on that one lol
Hope this helps mate?
Cheers
ShmeareD 1 year ago
@rodrigo125 A way to calibrate it could be to have say fishing line with a loop at one end going over the Y axis and the other end going over a pulley wheel with one kilogram tied to one end, now slide the loop end of the line up and down Y axis till you get 100 grams, that should give you your calibration point for one kilogram converted to 100 gram mark, mark that spot drill a hole and you have your 10 to one conversion point.
I'm starting to make my own brain hurt so ill leave it at that lol
ShmeareD 1 year ago