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« Reply #25 on: June 04, 2011, 02:31:00 PM »
azhaguvel
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Not only frustration and disappointment, It just needs one nice crash to trash your motor and servos. I was actually hovering a 3d plane in sim before I actually tried to fly my AXN floater but still it took lot of crashes.

Between tell us what you are trying to build
wingspan is the length of the wing from one tip to the other tip. 21" is very small, thats why wondering what you are trying to build.
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« Reply #26 on: June 04, 2011, 02:37:15 PM »
Swapnil
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@azhaguvel: Sir, would a 50 in span be O.K for a 243 Watt BLDC (A2836-8) ??
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« Reply #27 on: June 04, 2011, 02:49:54 PM »
azhaguvel
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Hehehe I am not a pro to tell everything from a motor spec. It also depends on the plane type you are trying to build. gusty sir is the wikipedia you can contact. Also VC sir Cheesy.
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« Reply #28 on: June 04, 2011, 02:54:07 PM »
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Hmm, Gusty sir doesn't seem to be online these days. Will try VC sir...
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« Reply #29 on: June 04, 2011, 05:53:31 PM »
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have calculated all the things please  guide me anywhere , if it is necessary

auw = 600 gram


{
so  motor should be = 1.5 * auw=  800 to 900 gram thrust. , max amp draw=25 amp

prop size =8*5 or equivalent

for esc =30 amp.

battery=  (2200mAH 20C Lipo Battery):   2.200AH  X  20C = 44.00Amps Max Constant
}


is all the calculations are ok for that weight ,

plz suggest
« Last Edit: June 04, 2011, 06:42:19 PM by vineet » Logged
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« Reply #30 on: June 05, 2011, 11:48:33 AM »
vineet
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ok is there is any way to buy electronics from china , i have heard that it take less time than hobby king.  indian lhs are beyond my budget.
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« Reply #31 on: June 09, 2011, 04:52:48 PM »
vineet
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ok now read and got all the litrature required for a plane to fly coming up with a plan ( 300 using coro )as it is the secure and cost effective for me , i want all these for him ,

http://www.rcindia.org/electric-planes/rcpowers-extra-300-using-3mm-coro/25/


plz pm me if anybody have the required electronics to sell
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« Reply #32 on: June 09, 2011, 07:47:22 PM »
PankajC
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vineet your calculations are way off target....

for a 600 gm plane, you dont require more than 100w which translates to 8-10amps for a 3cell. Check out my trainer at this link
http://www.rcindia.org/beginners-zone/i-finally-got-to-build-and-fly-a-pusher-trainer/msg62703/#msg62703

the cruising current is much less in my case about 47gm for a 500gm bird
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« Reply #33 on: June 09, 2011, 08:02:08 PM »
prateek13
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 I agree
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« Reply #34 on: June 09, 2011, 11:48:08 PM »
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what the calculations will do when there is no electronics
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« Reply #35 on: June 10, 2011, 10:10:24 AM »
PankajC
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well you have to consider these. If you are scratch building, consider the weight of electronics first. The eight of lipo, motor, prop, esc, landing gear, servo all need to be taken into account in addition to the construction material to arrive at a all up weight.

So you see, the wattage calculation and electronics required may require a couple of iterations to come up with a guideline on what your requirements are
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« Reply #36 on: June 10, 2011, 10:25:08 AM »
vineet
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i am building a plan which has taken up by many builder before, so i am using the same electroics they have used , thats why i dont think there is any chance of miscalculations , and

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« Reply #37 on: June 10, 2011, 05:13:28 PM »
PankajC
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I am not sure what model are you building so cannot comment.
However, for normal slow-fly highwinger type of a trainer, 60W per 500 grams of all up weight is considered safe, then we begin to multiply for different flying types like acrobatic , 3D etc.

I was looking at the caption as the requirements being for your first plane, hence then assumption was that you might be attempting a trainer type of a model.

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RC India  RC Baazar  Wanted  Topic: used (motor + esc +batery+prop +servo) for my first plane.
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