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Old Apr 20, 2014, 07:43 AM
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1800kv or 2200kv platform?

what would be a good foam trainer scratch build plat form for use of a 1800kv or 2200kv motor with a 25amp esc and 2200mah 3cel battery..i bought these cheap on craigslist and was hoping to use them ...
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Old Apr 20, 2014, 08:28 AM
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try a polyhedral glider type planes for starters or high wing type slow planes.
these planes are near foolproof even on 3ch , relatively stable.
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Old Apr 20, 2014, 08:42 AM
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what size prop would you recommend for either the 2 motors and could you point me a set of plans that I could study as I will be building this out of dollar tree foam board..
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Old Apr 20, 2014, 09:19 AM
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Hi hddave42,do you have the weight of the motor,or the part #?It will help narrow choices down.

That's a big battery,so you may have to scale up a plan to be bigger.
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Old Apr 20, 2014, 09:25 AM
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KV doesn't say much about the performance of the system except how fast the prop should be spinning. Higher KV simply means that the motor prefers to spin at a faster speed which requires you to use a smaller diameter prop if you don't want to burn out the motor. A lower KV simply means that the motor prefers to spin slower allowing you to use a larger prop or even a small prop with higher voltage.

You can get high thrust with high KV. You can also get high thrust with low KV. But generally the lower the KV the higher thrust you can get (either because you can use a larger prop or you can use a higher voltage battery).

The real question is, how many watts? Alternatively, what is the weight of the motor?

There's an old rule of thumb of watts/lb to tell you what sort performance an airplane has. But I personally use a different rule. I've noticed that there is generally a 1:10 thrust to weight ratio when it comes to brushless motor. Good quality motors can do better but even the worst cheap motor has roughly 1:10 thrust to weight ratio provided you use the right prop.

So, if I'm building an aircraft that's going to be roughly 300g and want a 1:1 thrust to weight ratio I'll look for a motor that weighs roughly 30g. Then I'll size my ESC, battery and prop around that motor.
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Old Apr 20, 2014, 09:39 AM
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can you indicate the Brand and model of that motor? because you can have different motors rated on different amp with similar KV maybe we can compute and estimate setup.

http://www.ecalc.ch/motorcalc.php?ecalc&lang=en
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Old Apr 20, 2014, 12:53 PM
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one is a HB2822 Brushless Motor, 1800 Kv

Hobbywing 30A Speed Controller..the
HB2822 Specification are...Max efficiency: 90%

Shaft Dia: 3.00mm

Weight (about): 29g

Unload current: 0.8A

Max current: 10.5A

Lipo Battery: 2S-3S

Recommend Propeller: 8*6(Or 9*6)

Thrust: 330g
.........Hobbywing 30A ESC specification: are ...
Output: Continuous 30A, Burst 40A up to 10 Seconds

1.2 Input Voltage: 2-4 cells lithium battery or 5-12 cells NiCd/NIMh battery

1.3 BEC: 2A / 5V (Linear mode)

1.4 Max Speed:

210,000rpm for 2 Poles BLM, 70,000rpm for 6 poles BLM, 35,000rpm for 12 poles BLM

1.5 Size: 45mm (L) * 24mm (W) * 11mm (H)

1.6 Weight: 19g

2.1 Safety Arming Feature:

Regardless the throttle stick position, the motor will not spin after battery connected.

2.2 Throttle Calibration:

Throttle range can be configured to provide best throttle linearity,

fully compatible with all market available transmitters.

2.3 Programmable Items:

Brake Setting: brake enabled / brake disabled.

Battery Type: Li-xx(Li-ion or LiPo) / Ni-xx(NiMh or NiCd).

Low Voltage Protection Mode(Cutoff Mode):

Gradually reduce the output power / Cutoff the output power.

Low Voltage Cutoff Protection Threshold (Cutoff Threshold):

low / medium / high.

Start Mode: normal / soft / very soft.

Timing: low / medium / high.

Reset: reset all the programmable items to their default settings.

2.4 Full Protection Features:

Low voltage cutoff protection / Over-heat protection / Throttle signal lost protection
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Old Apr 20, 2014, 12:59 PM
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the 2200kv is a ..BL-2212/6 .. the other esc I have is a hobbyking 25-30 a ... the battery I have is a Gforce 2200mah 40c ...hope this helps....thanks for the advice...
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Old Apr 20, 2014, 04:18 PM
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http://modelaero.com/product/SM2212-6G.html
http://www.hobbymaterc.com/hobbymate...del-p-151.html

hi. hddave would this be close to your specs. if so check on the recomended prop.
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Old Apr 20, 2014, 06:49 PM
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yes those are the exact motors that I have,,,now we know that much ,are there any scratch build trainer planes that would be good for these motors...
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Old Apr 20, 2014, 07:12 PM
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Quote:
Originally Posted by hddave42 View Post
yes those are the exact motors that I have,,,now we know that much ,are there any scratch build trainer planes that would be good for these motors...
for the 2200kv good for funjet or skysurfer type planes if you want something fast

wing types would be long and narrow or delta

the 1800kv would work for profile 3d planes or slow flying planes.
wing types would we wide wings. like a slowstick or nutball

check the scratchbuild section of the forum under foamies and find planes that closely match the motor setup.
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Old Apr 20, 2014, 07:24 PM
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i have been looking at a lot of planes... i kinda like the cub with a full airfoil wing and full body fus. ..
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Old Apr 20, 2014, 08:12 PM
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seems the cub would do well on that 1800kv
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Old Apr 21, 2014, 04:29 AM
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yea the cub would be a nice start, now I just have to find some planes and go to work..lol...thanks guys for all your help
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