- Jul 15, 2020
I agree 20 seconds is kind of long.So we are giving Raptor a built-in advantage here, simply because that run from 20 to 79 knots is the only data we have. Here is that clip starting at 3:36.
So let's review what we found already in my previous analysis. Measuring from
20 knots to 79 knots groundspeed, as shown on his display, we found 22 seconds, which works out to an average thrust of just 478 lbf. Now let's give the Raptor the benefit of the doubt and call it 20 seconds. That pushes his average net thrust up to 526 lbf.
Here is a clip of me flying the old P210N in the Texas STOL comp.
I am taking off from grass and am in the air in about 10 seconds from a dead stop! The plane is light with 1POB and ~200# in fuel. I estimate around 3200# gross. I am 310HP takeoff power.
As its comp flying I am yanking the plane off the ground as soon as it can fly so Vr is probably only 55KIAS. Still 10 seconds is a long long way from 20 seconds and grass is harder than smooth asphalt.