Anybody want to try this Calc ? - Page 2 - RC Groups
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Nov 17, 2012, 03:41 AM
"The Judge"
sebbe's Avatar
87 amps vs 162 amps ??

5s lipo, kv 1915, (DownUnders) 6x10 prop vs 7x10 prop

Should it really be such a difference ?


The rpm and voltage is the same, OK, so I have to lower the voltage manually, but still get like 140-150 amps on the 7x10 prop.. hmm ??
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Nov 17, 2012, 08:56 AM
Drinks Day Old Expired Milk
VooDoo Child's Avatar
Quote:
Originally Posted by invertmast
Speed is bang on for my setup.. flight time is 5 times longer (if only I could fit a battery bigger than 1300mah so i could get longer than 2 minute flight times), and amps are a bit higher
That is what i like to hear "Speed was bang on" Thanks for the input.
Nov 17, 2012, 08:58 AM
Drinks Day Old Expired Milk
VooDoo Child's Avatar
Quote:
Originally Posted by SlowBarless
Flightime and speed came out pretty close. Amps were a little low and voltage a little high.

Don't know what a Pound is
As long as you are not trapped under a woman that comes in at 350 pounds,there is no need to know what it is
Nov 17, 2012, 09:05 AM
Drinks Day Old Expired Milk
VooDoo Child's Avatar
Quote:
Originally Posted by sebbe
87 amps vs 162 amps ??

5s lipo, kv 1915, (DownUnders) 6x10 prop vs 7x10 prop

Should it really be such a difference ?


The rpm and voltage is the same, OK, so I have to lower the voltage manually, but still get like 140-150 amps on the 7x10 prop.. hmm ??
We are finding that some of the numbers are off no doubt Sebbe,but the big thing is that guys that know how fast there plane is,the MPH is coming out soooooooo close,so in effect,this is a good calc if you want to bang in some simple numbers to find out speed for future setups,or setups you have not got speed readings on,is that not what most sport pylon guys are looking for ? I for one found that this calc was within 3 to 4 mph of planes that i have,that is not to shabby.
Nov 17, 2012, 09:22 AM
SB7
SB7
I am actually really slow
How has he got the speed so close? Is the calc designed around slippery airframes?
Nov 17, 2012, 10:14 AM
"The Judge"
sebbe's Avatar
Quote:
Originally Posted by SlowBarless
How has he got the speed so close? Is the calc designed around slippery airframes?


I think the numbers are pitchspeed on prop, which means that very slippery airframes get close to those numbers..
Nov 17, 2012, 10:32 AM
Shut up and fly
papabatman's Avatar
so i played with it a bit the speed is a bit off said i get 159mph when i only get 124mph
this one is the closes i have found

http://2bfly.com/tools/
Nov 17, 2012, 11:06 AM
Ginger or MaryAnn ??
fh64_lucky's Avatar
MPH is right on with a couple of my planes, amps are low though.
Nov 17, 2012, 01:34 PM
Drinks Day Old Expired Milk
VooDoo Child's Avatar
Quote:
Originally Posted by fh64_lucky
MPH is right on with a couple of my planes, amps are low though.
That is what i was getting,MPH right on (a swing of 3 is nothing),with all amps being on the low side.
Nov 17, 2012, 01:37 PM
Drinks Day Old Expired Milk
VooDoo Child's Avatar
Quote:
Originally Posted by sebbe
I think the numbers are pitchspeed on prop, which means that very slippery airframes get close to those numbers..
I think you think to much ....I got a vid for you Dr Doppler
Nov 17, 2012, 02:13 PM
"The Judge"
sebbe's Avatar
Quote:
Originally Posted by VooDoo Child
I think you think to much ....I got a vid for you Dr Doppler
Yepp. someone got to do the thinking, you do the flying

Bring on the video, I will doppler TRUE...
Nov 18, 2012, 08:55 AM
Registered User
It's rounding up 4.47 to 4.8 pitch and dia..Looks like the figures I get though. (And pls make it possible to change pounds to metric)
/Håkan
Nov 18, 2012, 08:58 AM
Registered User
And amps out can be removed. (Has no relevance) But good indeed, quick and nice!
Nov 18, 2012, 03:19 PM
Suspended Account
Quote:
Originally Posted by papabatman
so i played with it a bit the speed is a bit off said i get 159mph when i only get 124mph
this one is the closes i have found

http://2bfly.com/tools/
Much harder to use I like VooDoo Child one better


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