RE: Overloading an engine
Greg,)
You are right. I did not use the 3-blade constant because I originally did not link between the previous posts (and videos) that discussed the 3-blade prop; and the post in which the RPM numbers appeared...
However, because only comparative figures were needed, to see what RPM displays the greatest torque, any constant I would use would give me the same result...
The HP numbers, however, were all factored down as a result...
I will post them again...
As to peak torque... The relationship of horsepower, RPM and torque is a mathmatical function...
Torque (in lbs.ft.) times RPM and divided by 5,252.1, equals Output (in HP)).
So, peak torque will ALWAYS be at a lower RPM than HP peak. There is no mathmatical possibility for it to be otherwise (unless the engine blows up during the test...[:@]).
The second special relationship between these graphs, is that if they are displayed on a single, two-axis Cartesian Plane, with the above units of measurement; they will always intersect at 5,252.1 RPM. Torque and HP will have the same number.
At that RPM, the numerical value of the torque will locally become lower than that of HP, as RPM rises.
But even at this point, the torque curve could still be rising, as RPM is increased (HP will still be rising, due to the mathmatical function that determines it).
Where the torque curve is level (same value over an RPM range), HP will increase as a direct function of RPM (and this part of its curve will be on a straight line from the root of the axes).
The graphs are not plotted together, but one is calculated from the values of the other, that are actually measured...
And, even in the light of Andrew Coholic's review of this engine, I only used the RPM numbers Juice supplied to plot this torque graph here.
These results do suggest a peak torque value at (or a bit below) 4,400 RPM...
There's nothing I can do to change that... (although some full-size car manufacturers do 'tailor' their graphs to smooth-out 'unattractive irregularities'... I 'caught' one such brochure, where the torque and HP did not 'compute'...Gotcha!!!).