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Old May 06, 2012, 11:03 AM
Question gravity.
KMKAZE's Avatar
Kane County, Il
Joined Sep 2000
1,585 Posts
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My proposed setup (new to this stuff)

Looking to get good power for my 6.7lb scratchbuilt seaplane (see my blog for a video)...I'm limited to a 13" prop, probably be swinging the same 13x8 3-blade as shown in the video. I THINK a 14" Master Airscrew 3-blade will fit, as the 13x8 Master Airscrew 3-blade actually has a smaller disc diameter than the APC 12x6 2-blade I have- so I'm going to order one just to find out....

Anyway here is my proposed setup:

The motor I'm looking at is an EMP C5055 KV700
https://www.leaderhobby.com/product....24&Location=LA

The battery would be a 4S 4-5000mah 25c

ESC I'm looking at is the Aeolian Evolution 80A
https://www.leaderhobby.com/product....=9394001225810

I think this setup would give good power and probably mimic a .60ish size engine. I haven't found a calculator that I can plug the motor's specs into, but I've seen others getting good results with it. I'm looking for around 9-10lbs of thrust at full throttle, so that I can fly around at half throttle or less, get excellent thrust, and be able to extend my flight times as long as possible.

What do you guys think?
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Old May 06, 2012, 11:40 AM
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Doug Bartley's Avatar
Canada, ON, Owen Sound
Joined Oct 2008
2,777 Posts
Motor should be OK, same for the battery, but The Aeolian anything has got togo!!!. Complete garbage!! Get a 80A Turnigy Plush along with its card, simple to set, about a bulletproof as they come. I've run 5 now without failure in several different planes for 4 yrs. FWIW Doug B
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Old May 07, 2012, 02:43 AM
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Letchworth, Great Britain (UK)
Joined Jul 2004
11,463 Posts
I can't comment on the equipment, but I can recommend WebOCalc (http://flbeagle.rchomepage.com, go to the software tab) for trying out motors and props with your model. In my experience it's quite accurate in it's prop and performance predictions.
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Old May 09, 2012, 01:53 PM
DX5e fatal flaw- PM me!!!!
United States, NY, Cortland
Joined Sep 2010
2,839 Posts
I have a 5.5 lb trainer with a 770kv on 4S, if you are limited to a 13 inch prop and want close to 1:1 thrust (which you don't need) you will need more KV or a 5S or a 6S.

I can just hover for a few seconds with a 13x10 prop, but I'm going way beyond the rated 45 amps of my motor doing it.

You will get a little more thrust from a 3 blade, but my gut says you'll be a little down on power if you are going for something sporty.

If it's a low wing loaded floater, it would be quite sufficient, also if you aren't really looking for a lot of extra thrust.

All the above-my guess based on my plane, not the word of an expert.
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Old May 10, 2012, 08:11 AM
Question gravity.
KMKAZE's Avatar
Kane County, Il
Joined Sep 2000
1,585 Posts
Quote:
Originally Posted by CNY_Dave View Post
I have a 5.5 lb trainer with a 770kv on 4S, if you are limited to a 13 inch prop and want close to 1:1 thrust (which you don't need) you will need more KV or a 5S or a 6S.

I can just hover for a few seconds with a 13x10 prop, but I'm going way beyond the rated 45 amps of my motor doing it.

You will get a little more thrust from a 3 blade, but my gut says you'll be a little down on power if you are going for something sporty.

If it's a low wing loaded floater, it would be quite sufficient, also if you aren't really looking for a lot of extra thrust.

All the above-my guess based on my plane, not the word of an expert.
Well of course I don't NEED a 1:1 thrust ratio, but it would be nice to have- as it would be neat to see the plane separate from the water and rocket straight up for some altitude.

I know the plane isn't a 3D design, but I'd like to have the power on demand if I need it, otherwise staying around 50% throttle and enjoying long flights.
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