ORIGINAL: downunder
ORIGINAL: DarZeelon
...And I believe torque is very scalable.
Torque is scalable...HP isn't. F2D is combat and while the high end engines are extremely powerful they're not in the same class as F2A (which are the engines I'm talking about). An "over the counter" F2A engine (like an Irvine 15R or Profi) will produce around 2HP at 40K and scaled up this would mean an F1 pylon engine making 5.3HP.
Not impossible.
Brian,
HP is equal to torque (
in Lb. -Ft.), times RPM, divided by 5252.1.
This, since 1 HP is equal to 33,000 lbs x Ft. per minute.
If you look at HP and torque graphs, shown on the same system of axes, they will always intersect at 5,252.1 RPM. This is the RPM at which the numerical value of torque and HP is identical
So HP is a linear function of both RPM and torque.
If torque is the same and RPM is doubled, HP is doubled as well.
If an engine gives half the torque at double the RPM, HP remains the same, and so on.
Most F1 pylon racing engines, MVVS GRRT/GRFT, Nelson, Jett, Profi, get their maximum performance between 28,000 and 35,000 RPM. There, they do get 3-3.6 HP.
If torque can be retained to 40K, HP would be around 4.1, I believe.
5.3 would to me seem not possible.
If I scale down the 4.1 HP to the .15 cid size, it would be 1.5375 HP. This I would consider the limit.
But since F1 engines must be run without a tuned-pipe, i.e. no boost and F2D engines have a tuned-pipe, the difference to 2 HP that you wrote about is made up.
Only if a full length pipe was allowed in F1 pylon and the engines were capable of and timed for 40,000 RPM, would these engines theoretically get to 5.3 HP...