Help chossing the power system

[thiagu]

I am building a rc aircraft of
Wing span = 1m
Weight = 1000gms
 pls help me to choose the power system and i need my aircraft to be in air for max 30mins
with medium trottle

[Moderator]

You are ideally looking at a esc of about 25-30amps. Motor should in the range of 200W. Battery should be 2000mah 3 cell.

[thiagu]

Thanku Sahilkit,
Actually i reduced my airframe weight
Weight=750gms
wingspan=1000mm
chord=100mm
and i am planning 4 a pusher type model can u advice me 4 the prop dimensions(pusher) and battries 4 running it max of 20-30mins with a 175watts brushless motor..

[mps]

What motor do you plan to use ? What type of flying are you planning on...
Trainer or Aerobatic or 3D (extremely aerobatic), because, choosing the prop type has a bearing on this as well. As for time of flight... can only be decided by the amp draw of the motor-prop combination... Thus the sizing of the battery will be decided also by the type of flying you plan to do...

Saju

[sahilkit]

hi thiagu

for wing loading calculation, i have used this calculator (i use it and works fine for my builds)

http://www.csd.net/~cgadd/eflight/calcs_wingload.htm

Wing Area                     156sq.in   10sq.dm
Total Wing Loading    24oz/sq.ft   75g/sq.dm

the above values are for wing span=1000mm,chord=100mm and AUW of the plane at=750grams
according to calculator the model you are trying to build is an extreme of an sport plane ! and make sure that your A/R ratio is some thing like 1:5-1:6

Wing Loading
Loading     Type
10 oz/sq.ft     Glider
15 oz/sq.ft     Trainers
20 oz/sq.ft     Sport Plane
25 oz/sq.ft    ; Fighters

to saju

can u post the details here to

thanks

sahil

[sahilkit]

hi thiagu

see this link it might be of help

http://www.goldenskiesrc.com/Basic_Elctric_Conversions.pdf

sahil

[yash]

thiagu chk this link for calculation for ur rc plane...http://adamone.rchomepage.com/calc_motor.htm

[Capt Manish Chandrayan]

IMHO with the span, chord  and weight you are designing you are looking for a glider configuration (High aspect ratio)

[M.P.Saju]

hi thiagu

Check Webocalc 1.05. This is a calculation you can download onto your computer. It is free and simple to use and fairly accurate.
You can get this at http://flbeagle.rchomepage.com. Also, there is the more traditional Powercalc. But both are good.

Saju

[ron_van_sommeren]

Choosing a power setup
http://www.rcgroups.com/forums/showthread.php?t=739069
http://www.wattflyer.com/forums/showthread.php?t=27019

Compilation of e-flight calculators:
http://www.rcgroups.com/forums/showthread.php?t=606703

Vriendelijke groeten Ron
near Nijmegen, Netherlands