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Old Jan 18, 2013, 08:44 PM
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Canada, MB
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Originally Posted by Herman Munster View Post
Well if you have any doubts about buying the plane, don't. It's a very nice flying plane and with the use of the flaps, has some nice slow flight characteristics. Also, it flies equally as good off of snow as it does off water.
Took the 'plunge' no pun intended and ordered mine today.

Any advice or setup info for electric operation appreciated (I will read through the posts here but if you have a specific setup that works well let me know - want to ensure that it is not under powered).
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Old Jan 19, 2013, 12:04 AM
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United States, Mt, Libby
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I'm running mine on Hacker A50-14L which is over powered but then I'm also using scale 4 bladed props. I know a lot of guys are using Eflite power 46 with good success, so I'd recommend those or power 52 for a little extra power. I'd highly recommend putting the batteries in the nose of the plane. I know the ideal place for the batteries is in the nacelles, but if you go that route you'll end up adding a fair amount of lead to the nose to get it to balance.
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Old Jan 19, 2013, 08:29 PM
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Originally Posted by Herman Munster View Post
I'm running mine on Hacker A50-14L which is over powered but then I'm also using scale 4 bladed props. I know a lot of guys are using Eflite power 46 with good success, so I'd recommend those or power 52 for a little extra power. I'd highly recommend putting the batteries in the nose of the plane. I know the ideal place for the batteries is in the nacelles, but if you go that route you'll end up adding a fair amount of lead to the nose to get it to balance.
I like the idea of running 4 blade too. Your plane looks great! But I think I will opt for 3-Blade for efficiency.


Not sure I wanted to spend $100+ per motor....

How about the Exceed Rocket series? What do you think about these for power with say a 13x8x3 using 5s? or 14x9x3 using 4s? If I can use 4s that would be preferable as I have 4s already.

This one: http://www.hobbypartz.com/86mc451-4120-515kv.html

or

http://www.hobbypartz.com/86mc450-4120-660kv.html


How large a prop blade can be used?

How many watts is required to fly this plane leaving some power to spare?
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Old Jan 19, 2013, 11:07 PM
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4s or 5s

I guess I could upgrade the 4s EDF jet that I have to 5s...don't want to have too many different batteries kicking around.

So I am narrowing it down...

I do plan to counter-rotate the props so that limits my choices.

My thoughts:

Exceed RC Rocket 4120-515KV http://www.hobbypartz.com/86mc451-4120-515kv.html

4S - would run 13x8 3-blade

5S - would run 12x6 3-blade

These 2 combos show nearly identical static thrust. 4S draws 10% more amps.
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Last edited by Flying By; Jan 20, 2013 at 01:39 AM.
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Old Jan 20, 2013, 01:20 AM
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United States, Mt, Libby
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I think either of those motors would work. I would highly recommend running this plane on 5s and plan on using 2 batteries and running them in parallel. If you have to buy new batteries I'd go with 5000mAh batteries, that way you get good run time and you will defiantly need them for the weight. Better to have your ballast as batteries instead of lead. As for props, 11" is scale, 12" is OK, anything bigger and you'll be kicking up tons of spray because they'll be close to the water.
Here's a good calculator to check motor/prop combinations.
Nitroplanes claims 9-10 pounds for this plane but figure around 14# AUW
If you figure 100 watts per pound for your motors I think that'll put you at a nice figure giving you the power you need plus a little extra for those moments when you might need it.
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Old Jan 20, 2013, 02:30 AM
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Thanks HM.

If 14 lbs is what I need to base it on, then I am leaning towards these options.

A.
5S, 660KV, 11x7x3
eCalc shows 6 to 11 minutes flight on 2x5000mah pack with about 15 lbs of thrust for both motors combined. Should go vertical!

B.
5S, 515KV, 11x7x3
eCalc shows 11 to 19 minutes flight on 2x5000mah pack with about 10.5 lbs of thrust for both motors combined.

C.
5S, 515KV, 12x6x3
eCalc shows 9 to 16 minutes flight on 2x5000mah pack with about 11.5 lbs of thrust for both motors combined.

D.
If I go 6S
6S, 515KV, 11x7x3
eCalc shows 8 to 14 minutes flight on 2x5000mah pack with about 15 lbs of thrust for both motors combined.

Looks like low battery amp draw, under 10C, so I could probably get 20C batteries and be safe.

So A, B, C or D?

I have seen and read that some have cut down props to get to their desired size. I have done this when I have chipped a blade and trim the other blade to match and then re-balance.

I could get the 13x8x3 and trim down to 12x8x3.

This would allow me to run 5s on the 515kv motor and get close to 15 lbs of thrust and 8 to 13 minutes of flight time.
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Old Jan 20, 2013, 12:11 PM
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Originally Posted by Flying By View Post
D.
If I go 6S
6S, 515KV, 11x7x3
eCalc shows 8 to 14 minutes flight on 2x5000mah pack with about 15 lbs of thrust for both motors combined.

Looks like low battery amp draw, under 10C, so I could probably get 20C batteries and be safe.



I could get the 13x8x3 and trim down to 12x8x3.

This would allow me to run 5s on the 515kv motor and get close to 15 lbs of thrust and 8 to 13 minutes of flight time.
These options sound the best. Nothing wrong with cutting down a prop to get what you need , that's what I did for my 4 blade props. They were 15" and I cut them down to 12". As for C rating on your batteries, if you are buying new batteries I would 30C at a minimum. You get more punch for your $$ and the possibility of being able to use them in another aircraft that needs the higher C rating.
You can group 2 of the 3s batteries in series to make a 6s if you decide to go that route.
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Old Jan 21, 2013, 05:56 PM
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.90 thrust to weight ratio okay? Based on 14 pounds AUW.

11x7 3 blade on 5s with leopard 5055 550kv
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Old Jan 21, 2013, 10:55 PM
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Mr. Munster,

What kv is your Hacker motor?

What is the actual size of your 4 blade prop (after you trimmed it)?

Just trying to enter your figures in eCalc so I can have an idea of the actual watts, thrust, etc that you are producing with your setup.
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Old Jan 21, 2013, 11:48 PM
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[QUOTE=Flying By;23885043].90 thrust to weight ratio okay?


If by that you mean a .9 to 1 thrust to weight ratio then yes, that is very good. A 1 to 1 would mean it was capable of going vertical.

I'm running the Hacker A50-16S V2. It's a 378 KV motor Here's the link if you want the stats.
https://www.aero-model.com/8_69_903/...-16S%20V2.html.
The props I'm using are 12 X 12 4 blade.
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Old Jan 22, 2013, 12:05 AM
Parkcityflier
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Originally Posted by Flying By View Post
.90 thrust to weight ratio okay? Based on 14 pounds AUW.

11x7 3 blade on 5s with leopard 5055 550kv
You should be looking at the Watts per Sq. Ft. wing area. This will give you a better idea of predicted performance. 90 W/Lb would give you a good flying airplane. You could have brick with a .90 thrust to weight ratio and obviously it wouldn't fly very well.
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Old Jan 22, 2013, 01:59 AM
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Originally Posted by parkcityskier View Post
You should be looking at the Watts per Sq. Ft. wing area. This will give you a better idea of predicted performance. 90 W/Lb would give you a good flying airplane. You could have brick with a .90 thrust to weight ratio and obviously it wouldn't fly very well.
You obviously haven't read the discussion we've been having concerning this subject.
I already let him know that for the requirements he wanted he should be looking at something with around 100 watts per pound. The thrust figures he's asking about are obtained from eCalc. so certain specs have been meet to obtain the thrust figure.
Watts per Sq. Ft. wing area isn't really the proper way to figure predicted performance.
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Old Jan 22, 2013, 08:43 AM
# Scale is a way of life
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United States, CA, Orange
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Originally Posted by Herman Munster View Post
,,,,,,,,,,,,

Nothing wrong with cutting down a prop to get what you need , that's what I did for my 4 blade props. They were 15" and I cut them down to 12".
HM, What props are you using exactly,

I've had a kit on the shelf for about 2 years, I had bought 70 4 strokes also. I tried to sell it all but had no takers and now have decided to go EP,, I picked up a couple power .46 motors 80 amp esc. I also plan to eliminate the water rudder and use throttle mixing for yaw control while taxing only.
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Old Jan 22, 2013, 01:08 PM
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Originally Posted by scale_only View Post
HM, What props are you using exactly,

I've had a kit on the shelf for about 2 years, I had bought 70 4 strokes also. I tried to sell it all but had no takers and now have decided to go EP,, I picked up a couple power .46 motors 80 amp esc. I also plan to eliminate the water rudder and use throttle mixing for yaw control while taxing only.
I'm using APC 15.5 X 12 4 blade and cut them down to 12 X 12.
http://www.apcprop.com/SearchResults.asp?Cat=4
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Old Jan 22, 2013, 09:55 PM
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[QUOTE=Herman Munster;23888666]
Quote:
Originally Posted by Flying By View Post
.90 thrust to weight ratio okay?


If by that you mean a .9 to 1 thrust to weight ratio then yes, that is very good. A 1 to 1 would mean it was capable of going vertical.

Yup, that's what I mean. Thanks again. I am sure I will have lots of questions as I start my build.

What did you use to mount the motor? I saw the PEX pipe/threaded rod set up earlier in the thread. Is the motor really that far away from the mounting wall?
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