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Old Jun 15, 2012, 06:54 AM
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robs's Avatar
United States, NY, Dutchess
Joined Jun 2002
652 Posts
Thanks for the suggestions. Control surfaces direction and neutral state were validated by others at the field along with checking for warped wings, out of alignment fuse, etc. No chattering of servos is heard after powering up or returning to neutral, so I doubt this is related to the servos. Next attempt will be with a much forward CG. If that doesn't work, I'll start playing with the thrustline. But that'll have to wait until after the weekend as work and life are intruding on my flying time.
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Old Jun 15, 2012, 09:02 AM
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Starving Bushman's Avatar
United States, VA, Alexandria
Joined Nov 2011
522 Posts
I am trying to, but do not yet, understand the whole electrical "equation" to ensure a good setup. So I am seeking advice for the best prop for this motor. I have a bigger motor that I will put on the Fun Cub later but I was going to start with this one..........

Turnigy D3530/14 1100KV

Spec.
Battery: 2~4 Cell /7.4~14.8V
RPM: 1100kv
Max current: 22A
No load current: 1.6A
Max power: 315W
Internal resistance: 0.077 ohm
Weight: 73g (including connectors)
Diameter of shaft: 5mm
Dimensions: 35x30m
Prop size: 7.4V/12x6 14.8V/8x4
Max thrust: 1100g

I have 3s 2200mah batteries to use with it so maybe a ?????

I have a watt meter to test but I don't want to just go buy 10 props not knowing what I'll use so any guidance would be appreciated.
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Last edited by Starving Bushman; Jun 15, 2012 at 09:09 AM.
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Old Jun 15, 2012, 09:37 AM
Registered User
United States, MN, Maple Grove
Joined Jun 2011
42 Posts
Quote:
Originally Posted by Starving Bushman View Post
I am trying to, but do not yet, understand the whole electrical "equation" to ensure a good setup. So I am seeking advice for the best prop for this motor. I have a bigger motor that I will put on the Fun Cub later but I was going to start with this one..........

Turnigy D3530/14 1100KV

Spec.
Battery: 2~4 Cell /7.4~14.8V
RPM: 1100kv
Max current: 22A
No load current: 1.6A
Max power: 315W
Internal resistance: 0.077 ohm
Weight: 73g (including connectors)
Diameter of shaft: 5mm
Dimensions: 35x30m
Prop size: 7.4V/12x6 14.8V/8x4
Max thrust: 1100g

I have 3s 2200mah batteries to use with it so maybe a ?????

I have a watt meter to test but I don't want to just go buy 10 props not knowing what I'll use so any guidance would be appreciated.
I would suggest that an APC 11x5.5 be one of the first props you try.

Mike
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Old Jun 15, 2012, 10:11 AM
Smooth not Shaky
EFlapper's Avatar
United States, CO, Highlands Ranch
Joined Nov 2011
51 Posts
Quote:
Originally Posted by Starving Bushman View Post
I am trying to, but do not yet, understand the whole electrical "equation" to ensure a good setup. So I am seeking advice for the best prop for this motor. I have a bigger motor that I will put on the Fun Cub later but I was going to start with this one..........

Turnigy D3530/14 1100KV

Spec.
Battery: 2~4 Cell /7.4~14.8V
RPM: 1100kv
Max current: 22A
No load current: 1.6A
Max power: 315W
Internal resistance: 0.077 ohm
Weight: 73g (including connectors)
Diameter of shaft: 5mm
Dimensions: 35x30m
Prop size: 7.4V/12x6 14.8V/8x4
Max thrust: 1100g

I have 3s 2200mah batteries to use with it so maybe a ?????

I have a watt meter to test but I don't want to just go buy 10 props not knowing what I'll use so any guidance would be appreciated.

I set your specs into my motocalc software and it came back with APC 10x5 as the best choice. The motor temp was too high with an 11x5. If you do want to check out the bigger props, you should use a heat sensor on a test stand set up. While motocalc is a good tool, it is not always right and I use it to zone in but not as a final answer.

Dick
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Old Jun 15, 2012, 11:02 AM
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eddy4753's Avatar
United States, WI, Milwaukee
Joined Apr 2010
110 Posts
BTW, what is the wing area on the FC.

TIA,
eddy
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Old Jun 15, 2012, 11:27 AM
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Starving Bushman's Avatar
United States, VA, Alexandria
Joined Nov 2011
522 Posts
Thanks Mike and Dick. That gives me a place to start. As long as I don't exceed to motor's max amp rating I should be okay, right?
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Old Jun 15, 2012, 01:46 PM
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wjjones's Avatar
United States, MN, Minneapolis
Joined Jun 2001
226 Posts
Quote:
Originally Posted by Starving Bushman View Post
I am trying to, but do not yet, understand the whole electrical "equation" to ensure a good setup. So I am seeking advice for the best prop for this motor. I have a bigger motor that I will put on the Fun Cub later but I was going to start with this one..........

Turnigy D3530/14 1100KV

Spec.
Battery: 2~4 Cell /7.4~14.8V
RPM: 1100kv
Max current: 22A
No load current: 1.6A
Max power: 315W
Internal resistance: 0.077 ohm
Weight: 73g (including connectors)
Diameter of shaft: 5mm
Dimensions: 35x30m
Prop size: 7.4V/12x6 14.8V/8x4
Max thrust: 1100g

I have 3s 2200mah batteries to use with it so maybe a ?????

I have a watt meter to test but I don't want to just go buy 10 props not knowing what I'll use so any guidance would be appreciated.
I'm in the same boat. Electronics may as well be alchemy or some other dark art to me, too. So this makes me wonder why more folks don't just get the power system recommended by Multiplex, which is already figured out and performs great--is it the cost? I got the recommended system, BTW, and I'm happy with it.
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Old Jun 15, 2012, 02:04 PM
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United States, MN, Maple Grove
Joined Jun 2011
42 Posts
Quote:
Originally Posted by wjjones View Post
I'm in the same boat. Electronics may as well be alchemy or some other dark art to me, too. So this makes me wonder why more folks don't just get the power system recommended by Multiplex, which is already figured out and performs great--is it the cost? I got the recommended system, BTW, and I'm happy with it.
Several reasons come to mind:
1) Some of us like to tinker and the shopping for the parts is part of the fun.
2) People want different things out of their planes and tailor the power system to match their flying style.
3) Some like to single source their parts so they only have to wait for one shipment. The LHS that carried the fun cub in stock, did not have MFG recommended power system on the shelf.

Mike
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Old Jun 15, 2012, 02:19 PM
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Starving Bushman's Avatar
United States, VA, Alexandria
Joined Nov 2011
522 Posts
$15 motor versus $110 power pack. I already have everything else that I need.
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Old Jun 15, 2012, 06:05 PM
Smooth not Shaky
EFlapper's Avatar
United States, CO, Highlands Ranch
Joined Nov 2011
51 Posts
Quote:
Originally Posted by Starving Bushman View Post
Thanks Mike and Dick. That gives me a place to start. As long as I don't exceed to motor's max amp rating I should be okay, right?
Not exceeding the motor's max amps is a good guideline but max amps can be exceeded. The real limit is heat. Most mfg's do not list the max heat limit because of cooling while in flight is not known. A motor in open air can be be run at higher amps than a motor enclosed by cowling. So yes, plan to use max amps as your limit and you will probably not exceed the heat limit of your motor.

Dick
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Old Jun 15, 2012, 06:46 PM
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bubbleman's Avatar
Joined Jan 2007
563 Posts
Quote:
Originally Posted by Starving Bushman View Post
I am trying to, but do not yet, understand the whole electrical "equation" to ensure a good setup. So I am seeking advice for the best prop for this motor. I have a bigger motor that I will put on the Fun Cub later but I was going to start with this one..........

Turnigy D3530/14 1100KV

Spec.
Battery: 2~4 Cell /7.4~14.8V
RPM: 1100kv
Max current: 22A
No load current: 1.6A
Max power: 315W
Internal resistance: 0.077 ohm
Weight: 73g (including connectors)
Diameter of shaft: 5mm
Dimensions: 35x30m
Prop size: 7.4V/12x6 14.8V/8x4
Max thrust: 1100g

I have 3s 2200mah batteries to use with it so maybe a ?????

I have a watt meter to test but I don't want to just go buy 10 props not knowing what I'll use so any guidance would be appreciated.
The 10x5 would be the choice for this motor. Look at the recomended props:

cells 2...............3................4
prop 12x6........10x5..........8x4

Anton
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Old Jun 15, 2012, 06:52 PM
Aus
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Aus's Avatar
Australia, ACT, Amaroo
Joined Jul 2011
1,268 Posts
Quote:
Originally Posted by eddy4753 View Post
BTW, what is the wing area on the FC.

TIA,
eddy
From the building instructions:

Wing area = 38 dm² (589 inches²)
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Old Jun 15, 2012, 09:41 PM
cheapskate extroardinairé
United States, CA, Marin
Joined Jul 2011
1,086 Posts
can i use this motor on it? (on a 4s with a 13x6 prop) http://www.hobbyking.com/hobbyking/s...00KV_815W.html
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Last edited by baconflyer; Jun 15, 2012 at 10:04 PM. Reason: forgot to put the link in
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Old Jun 16, 2012, 12:48 AM
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Australia, QLD, Brisbane
Joined May 2012
97 Posts
Quote:
Originally Posted by baconflyer View Post
can i use this motor on it? (on a 4s with a 13x6 prop) http://www.hobbyking.com/hobbyking/s...00KV_815W.html
Hi everyone

At 171 grams the motor is a bit on the heavy side haven't really seen people use a motor that heavy after researching motors. And using 4's is not as common, that should be a rocket ship! The recommended motor here weighs 134 grams http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXAAGX

I decided to go the powerful option with a faster motor bit more than 1100 and bit less than 1250 that some people use. The weight of the motor is 141grams. http://www.hobbyking.com/hobbyking/s...dProduct=18120.
For now not certain but a 11x5.5 or a 11x7 prop should be good.
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Old Jun 16, 2012, 12:50 AM
You down with EPP?
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Houston, Tx
Joined May 2009
6,851 Posts
My motor weighs 100g which is lighter than the stock motor.

With the alumimun motor mount (8g heavier than stock)

I am nose heavy with my 3S 2650mah pack all the way back as far as it will go.

So anything heavier and you are really going to have to get creative.
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