ORIGINAL: olnico
ORIGINAL: JCINTEXAS
ORIGINAL: buz914
I'm not trying to start any trouble, but I always thought speed could not be scaled up or down because speed has to do with time. And time can not be altered ''scaled up'' ?
I've always wondered if this was correct? Please explain.
Buz
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Buz,
According to Einstein, velocity does alter time...but E=MC(squared) is way beyond our discussion here. (I know a little about bass fishin but hardly anything about nuclear fishin 
) If we look at speed in terms of fuselage lengths traveled per second we can get some interesting comparisons. Have you ever seen a big Lockheed C-5 Galaxy or a Boeing C-17 Globemaster on final for landing? It looks like it's hardly moving and about to fall out of the sky. The plane is flying at 130 plus knots, but it looks very slow because of the aircraft's size. Another example is when you see a big ship underway at 20 knots and running beside it at the same speed is a 15 ft boat with an outboard motor. The little outboard looks like it's really hauling while the big ship is just crawling. So we are talking about perceptions...perceived speed. Anyway, what I was saying in my original post...in terms of fuselage lengths traveled per second, if the RC jet were scaled up to the size of an F-15 Eagle, and flew at the same rate as the model jet, 64.15 fuselage lengths per second... then it would be flying at 2,788.5 MPH ... about Mach 3.6
Regards
JC (FASSTFLIER)
PS: I think this is why we hear about cars being hit by trains at RR crossings. The drivers think they can ''beat the train'' because the train does not appear to be moving very fast.
Hi JC.
Your computation is perfectly correct in terms of visual perception of the speed. And I believe that this is what your term ''scale speed'' refers to.
On that respect it is a very interesting computation to do for scale competitors. With that stuff people could adjust their flying speed so that they look perfectly scale in flight.
Thank you for sharing your thoughts.
Thats a great point. This is why it doesn't look scale to fly your Skymaster F4 with a P200 full throttle. lol.