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Old Apr 07, 2003, 11:30 PM
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Seattle Washington
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Axi 2820/10 Motor: What's the smallest plane you guys have packed these into?

Hey guys,

I am interested in getting a rediculous climb rate out of my existing power system (provided I get the stupid thing working properly), and am trying to find out the smallest plane I can put it in in order to really get my weight down...

Was thinking about trying to squeeze it into the ascent or the kelly... On 7 cell 600ae packs with a 12x6, motocalc is claming about 1800ft/min...

Anyone have any experiences to share?

-kelly
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Old Apr 08, 2003, 06:54 AM
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United States, FL, Starke
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You will probably have to run the motor wiring outside the fuze in a tight setup like these. Others have already done this (there are photos somewhere here on the zone showing it).

I have one in an Omega 2M and an Accord 47 but both of these have a lot of room.

Good luck,
Dave
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Old Apr 08, 2003, 11:49 AM
Mr Mootsie
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Pepperell, MA, USA
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what controller are you using for your Omega set up?
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Old Apr 08, 2003, 03:40 PM
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Albuq, NMex USA
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Kelly,

I think that 600ae cells are for spd 400 type motors. You may want to check out the amps with the AXI and a 12X8 prop.

I tried around 30 amps with a 7X 600ae pack- got real hot and shut off early. If they are welded cells, the tabs will melt the heatshrink. That is my experience.

Good luck.

Mike
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Old Apr 08, 2003, 04:22 PM
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dude hang this dream up. AXI on 2820/10 on 600ae is a recipe for disaster. Use cp1300 or h/r aup cells.

But all of this is moot... If you want a fast/hot setup get a mega 16/15 motor and prop it accordingly. Maybe a hacker b20 with a gearbox. But an axi is too big for what you want to do...

j
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Old Apr 08, 2003, 04:38 PM
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Calgary, Alberta
Joined Nov 2001
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I guarantee that you'll fold the wing on a Kelly on the first climbout with that much power on board. It uses a piece of spruce that's about 1/2"x1/8" as a spar...how strong can that really be?
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Old Apr 08, 2003, 06:08 PM
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Quote:
Originally posted by MrMootsie
what controller are you using for your Omega set up?
TMM 40e - 3ph (I got 2 of them for less than $100 when NSP had them on sale... or, rather, was giving them away).



Dave
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Old Apr 08, 2003, 06:16 PM
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darn doc,

That omega is beeyootiful!!! Sure you want to keep it....

I may have to order one of these...

j
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Old Apr 08, 2003, 08:15 PM
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Order one. I'm not selling mine.

Sorry, soho

Dave
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Old Apr 08, 2003, 08:39 PM
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greensboro NC
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AXI2820/10

I got fed up with my Aspire stock set up. just could not get it to climb. I took all that rubbish out, put in a AXI 2820/10 with a jeti 40 amp speed controller, a 14 X 7" folding prop, and with half throttle it climbs at 40/ 50 * angle. I am using 7x 2400 cells. I get 5 or 6 re starts with that set up. I dont think I could handle the vertical climb if I opened it all the way out. These are great motors.
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Old Apr 08, 2003, 09:16 PM
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Seattle Washington
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How do you get such a good climb rate out of your 2m plane with that setup when I only get about 3x500ft climbs (when it's working) with my axi 2820/10 in my kyosho stratus 2m.

The plane comes in around 46-48oz all up and is being run on 7x1400scr cells and a 13x7 cam prop.

Is it the airframe efficiency thats keeping me from getting monster climbs with this setup? I thought the axi was supposed to really haul some tail.

Edited by moderator Ric Duley - Please refrain from using inappropriate language.

-Kelly

p.s. Do you guys think you could pack an axi into the ascent nose with a little modification? Could throw a 10x6 prop on it and bring the amps down to about 18 and still have over 1000ft/min. Although motocalc is claiming 1100ft/min for my stratus and I don't think it's even close to that...
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Old Apr 08, 2003, 09:24 PM
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Miami Lakes, Florida, USA
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Re: AXI2820/10

Quote:
Originally posted by Motipete
I got fed up with my Aspire stock set up. just could not get it to climb. I took all that rubbish out, put in a AXI 2820/10 with a jeti 40 amp speed controller, a 14 X 7" folding prop, and with half throttle it climbs at 40/ 50 * angle. I am using 7x 2400 cells. I get 5 or 6 re starts with that set up. I dont think I could handle the vertical climb if I opened it all the way out. These are great motors.
I think your prop is too big. You'll probably get better efficiency and more climbs per flight if you reduce it to the prop size recommended on the Model Motors web page.
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Old Apr 08, 2003, 10:04 PM
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Re: Re: AXI2820/10

Quote:
Originally posted by Miami Mike
I think your prop is too big. You'll probably get better efficiency and more climbs per flight if you reduce it to the prop size recommended on the Model Motors web page.
I get great climbs on a 14x9.5 and EIGHT h/r aup cells. The motor can handle it. I am loosing some energy to heat, but the climb is better with the 14x9.5 than my 13x7. AND I get 4-5 climbs to about 500 feet, with LOTS of power left over...

The weight is what's keeping you guys from getting good climbs, the 1400scrc and 2400 cell packs are heavy. Use some cp1300 or h/r aup packs and I think you will find that the climb is MUCH better....

Doc, just teasing. I will get one with flaps and set it up just like yours....
j
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Old Apr 08, 2003, 11:09 PM
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Re: AXI2820/10

Quote:
Originally posted by soholingo
I get great climbs on a 14x9.5 and EIGHT h/r aup cells. The motor can handle it...
In Motipete's case with his Aspire, I don't think he needs or wants the maximum thrust the motor can handle. I believe he wants to be able to make the maximum possible number of climbs to altitude in order to search for thermals. In order to get the maximum benefit from the motor in that sense, efficiency is the object rather than thrust, and that means not wasting energy in the form of heat.

I have two AXI 2820/10 motors. One is in my Bandit and the other is in a sailplane. For the Bandit my objective is steep climbs, high speed, fast dives and aerobatics. My flights don't last very long but they're fun and exciting. I use the biggest prop that I feel is safe for the motor and controller, and they gets hot. Battery energy is wasted but I get lots of thrust. (I'm a little more conservative than you are. I use a 13 X 7.)

My objective with the sailplane is different. I don't need super steep climbs, I just want to get to altitude without struggling. With an 11 X 7 prop I can make several of those climbs without exhausting my battery, and I usually get flights of over 30 minutes even without much success at finding thermals. My sailplane's motor stays much cooler than the one in my Bandit.

The point is, the best prop for a hotliner isn't necessarily the best prop for a sailplane. It all depends on your objective.
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Old Apr 09, 2003, 12:31 AM
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Re: Re: AXI2820/10

Quote:
Originally posted by Miami Mike
I
<<a lot of good info on efficiency deleted>>

The point is, the best prop for a hotliner isn't necessarily the best prop for a sailplane. It all depends on your objective.
I won't disagree with that. But I do believe that getting to altitude quickly in either situation is good. I would think going with 7 cells would be better than worrying about the motor efficiency.

And to be fair. I use my bandit for both acrobatics and thermalling, and the same motor setup does me just fine. If I was REALLY trying to thermal I would put in the 7 cell packs and save the weight of the extra cell. I would still max out the motor.

Mike, what cells are you using? My motor NEVER gets hot, the esc is warm, and the batteries get even warmer. But my motor stays cool...

j
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