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Old Nov 17, 2012, 02:41 AM
"The Judge"
sebbe's Avatar
Sweden
Joined Feb 2006
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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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Old Nov 17, 2012, 07:56 AM
Drinks Day Old Expired Milk
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United States, OR, Portland
Joined Aug 2010
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Quote:
Originally Posted by invertmast View Post
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.
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Old Nov 17, 2012, 07:58 AM
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United States, OR, Portland
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Quote:
Originally Posted by SlowBarless View Post
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
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Old Nov 17, 2012, 08:05 AM
Drinks Day Old Expired Milk
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United States, OR, Portland
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Quote:
Originally Posted by sebbe View Post
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.
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Old Nov 17, 2012, 08:22 AM
I am actually really slow
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How has he got the speed so close? Is the calc designed around slippery airframes?
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Old Nov 17, 2012, 09:14 AM
"The Judge"
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Sweden
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Quote:
Originally Posted by SlowBarless View Post
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..
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Old Nov 17, 2012, 09:32 AM
Shut up and fly
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United States, CO, Firestone
Joined Jun 2008
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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/
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Old Nov 17, 2012, 10:06 AM
Ginger or MaryAnn ??
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United States, TX, Garland
Joined May 2005
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MPH is right on with a couple of my planes, amps are low though.
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Old Nov 17, 2012, 12:34 PM
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Quote:
Originally Posted by fh64_lucky View Post
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.
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Old Nov 17, 2012, 12:37 PM
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Quote:
Originally Posted by sebbe View Post
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
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Old Nov 17, 2012, 01:13 PM
"The Judge"
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Sweden
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Quote:
Originally Posted by VooDoo Child View Post
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...
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Old Nov 18, 2012, 07:55 AM
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Sweden (Åkersberga)
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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
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Old Nov 18, 2012, 07:58 AM
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And amps out can be removed. (Has no relevance) But good indeed, quick and nice!
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Old Nov 18, 2012, 02:19 PM
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Quote:
Originally Posted by papabatman View Post
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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