Does anyone have experience with a radar gun and most 3D airplanes? What speed would a UCD60 with 16x4W prop carry? What about a Funtana or Mayhem? I have seen police come to our club and radar jets, 140MPH or even Extra about 85 to 90. I'm guessing the smaller 40 or 60 size 3D planes are really pretty slow. Maybe 40-45MPH. I'm just wondering. Also, I think it would be pretty cool to own a radar gun. Anybody got advice on one?
Thanks,
Barry

hey barry hows it going up there? i have been wondering that same question about my ucd and was guessing about 50-55. i was thinking about taking my plane out to panimint valley and have my brother in law give me a ride and pace it just to see. lots of empty miles in panimint valley. should be fun to.

gjeffers,
Good to hear from you. I'm still mired in the snow. I'm working on planes and have several ready to go. Only trouble is I have about 12" of snow in my way. I envy you with all that good weather. How's the repaired Saito doing? I hope you are well and enjoying flying. I will enjoy again soon, hopefully.
Thanks,

Barry

enjoying it very much and in between storms it really is nice and ive been flying 2-3 times a week. my saito is running great and im getting ready to go tomorrow. later

What rpm are you swinging that 16x4W? Assuming you are getting 10k max in the air, you would be getting:

10000 rev/min x 60 min/hour x 4 inch/rev x (1/12 ft/inch) x (1/5280 mile/ft) = 37.88 mile/hour under no-slip condition.

Wow! That is even slower than I thought. I'm only getting about 9600RPM maximum. And that doesn't consider slip which we know is present. It's a wonder these planes even stay in the air.
Thanks for the info. Very curious indeed.
Thanks,
Barry

i know mine with a 15x6 is going faster than that and im only turning 9300! can you compute mine too Seanychen because i dont know what the h&*l you did with that formula (its greek to me)

thanks

More simple but not as technically correct-- but probably as accurate because of real life factors(true pitch of prop ect) is to take the pitch X RPM. Here is how close you get to the above formula. 10000rpm x 4pitch=40mph....close to 37.88

Calculating your 9300 x 6 = 55.8 mph--this is the theoretical speed of the column of air pushed by the prop at static if that is when you took your RPM reading.

The motor might unload to 10,200 in the air 10,200 x 6 = 61.2mph then subtract drag of air craft???my guess 30%(I have no basis for this it is only for example 30%)--(this drag will increase expenantaily with speed) or .3 x 61.2 =18.36 61.2-18.36 = 42.84mph.

Give us the Radar gun results when you get them.