Gryphon
Posts: 1982
Joined: 7/11/2003
From: Charlotte,
NC, USA
Status: online
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Hi there twinbrother,
The relationship between power and speed is close to cubic.
To go 15% faster, here is how much more power a person might need:
1.15 X 1.15 X 1.15 = 1.52 so it takes just over 50% more power while at MAX SPEED to fly 15% faster.
Assuming that you now fly at 95 MPH and want to get to 135 MPH:
135 MPH / 95 MPH = 1.42 so you want 42% more speed
1.42 X 1.42 X 1.42 = 2.86 you need to nearly triple your power.
3 times the power is not ridiculous; I am running 27 times the power of what I started with. Changed 40-45 MPH to 130 MPH.
Now I'm going for 30+ times the power....call that ridiculous, be brave and keep reading.
********* To get you the best advice we need to know a little more information.
1) Can you provide us with a wattmeter reading? Borrow a meter at the field and place it in line with your battery and ESC.
Please note if that reading is with a battery fresh off of charger or one with battery that has just been run down 5%-15%(more useful I believe). Discharge in air to keep components from overheating, but fly for no more than 1/2 min full throttle (or equivalent) besides taxing. Disregard numbers on meter from first 2 or 3 seconds.
2) As needed would you be willing to change any components?
3) More info on the brand names and model numbers of your motor/battery/ESC, links will be good too if you can.
We can use that info to run simulations by looking up the resistance value for your motor and its idle current, looking up the "C" rating for your batteries, looking up the burst rating of your ESC, etc....
4) Often we push past the ratings of manufacturers because we know that they are way too conservative at times. Would you be willing to do so or you will not consider it?
5) How warm or hot do your various parts appear to you after your landings? If needed are you able to provide 2 things for your parts? a) More incoming air, b) More room for that air to exit.
6) Your tentative budget.
7) Do you want to a)fly only as fast as your current parts allow, or b)as much as your budget allows, or c)you want to get to 135 MPH in level flight with no wind even if the required budget if a little more than yours?
Answers to above questions will help you get better answers that you will be happier with. Answer what you can.
Later,
Gryphon
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RE: Speed Freaks Wanted- Over 150 Members already ! - 
....Gryphon ....Welcome to the Brotherhood of Speed Freaks.... 
