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Old Feb 07, 2010, 11:58 PM
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Help!
Super charged easy star help

I've been looking at RC powers on youtube and arrived at the conclusion that the Super Sonic V2 combo would be plenty of power, as opposed to the Micro Jet V3 which Dave also recommends for this size aircraft.

The V2 and V3 claim to have about the same thrust (24oz), which still doesn't make sense to me, and both are designed to run on 6x5 pushers.

V2 comes with a 30A esc and the motor specs say it can draw a max of 28 Amps.
V3 has a 20A esc but the motor stats say it'll draw 30 Amps...
Anyone have the V3? Can you give REAL info about this ^?

My battery choices are as follows:
20C 16oomah 3s (rounds out to 32A) &
25C 1000mah 3s (25A).

Will the smaller battery be able to handle the V2 motors max draw of 28A for a few seconds, or should I get another 1600?

My current setup is Eflight Park 400 outrunner with Thunderbird-18 esc using a trimmed-to-7" 10x8E. The plane is 25.2 oz RTF and cannot handle vert for more than 25 feet.

Watching the "Wild Hawk Motor Testing" video is making me seriously consider the V3, and flying into never.

EDIT: Also wondering about the upcoming Multiplex Xeno (asked for one for my birthday), I don't want to spend an entire $175 on the recommended power system. Found a good motor/ESC combo, found a battery, but MPX says it needs a folding 9x6. Any suggestions, or does it really need one? P.S. I have a spare prop saver if I can just use that.

Thanks ahead
Dash
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Last edited by Dash 9; Feb 09, 2010 at 02:31 PM. Reason: new question
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Old Feb 08, 2010, 06:38 AM
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Here is what I have: I'd not want the 2212-6 v2 at more than 25A, nor the MicroJet 2208-8 v3 at more than 20A.
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Old Feb 09, 2010, 10:15 AM
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One of the most commonly used upgrade motors for the EasyStar is the Turnigy 2835, 2200 Kv inrunner. It's been working flawlessly on two EasyStars so far, powered by a 3S/1800 20C lipo (Zippy Flightmax) and 25 or 30A ESC.

If you want to spend more, go with an ARC inrunner of similar specs (28 mm diameter, and similar Kv rating.)
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Old Feb 09, 2010, 04:44 PM
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Difficulty with ARC is that the 28-37-3 is too hot (2500Kv) and the 28-37-4 is too cool (1800Kv)...we need a 3.5!.... both of these are a LOT heavier (80g) than the Supersonic v2 (54g) or the MicroJet v3 (39g).
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Old Feb 09, 2010, 07:55 PM
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Rpm/kv?

MJV3 fits the range I think, 2200r/k. (2500+1800)/2=2150 if my math is right. Correct me if I'm wrong, I'm still getting used to all these numbers.
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Old Feb 09, 2010, 10:33 PM
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That's what I was saying... the Supersonic and Microjet are around 2200Kv and suited to a 6x4 on 3s (~20A)... with that prop the ARC 28-37-3 at 2600Kv draws a LOT of amps (>31A)... the ARC 28-37-4 (1800Kv) won't draw enough (maybe 15A).
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Old Feb 09, 2010, 11:43 PM
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uhh...

I feel like you're talking in riddles, which from experience I know sounds a lot like trying to sort it out yourself. V2 or V3?
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Old Feb 10, 2010, 06:22 AM
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I have an East Star

With HXT 2835 - 2200kv, 30amp speed controler and i normally run on 1600 or 1800 or 2200 3s lipos

Awesome set up, the HXT2835 has a heat sink so you need some minor elapor sculpting to make fit, but easy enough.

Also i have to watch the CG balance point when i use the different batteries as the 1600 3S is a lot lighter then the 2200 3s.

I marked in the bay where each battery should be velcroed. I use a 6 X 3 GWS prop but a 6 X 4 would also be great.

I do not have a wattmeter but i would think about 200 to 250 watt.

Plane flies like a hot liner if you want. But i prefer to get up there and glide around
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Old Feb 10, 2010, 07:37 AM
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Quote:
Originally Posted by Dash 9 View Post
I feel like you're talking in riddles, which from experience I know sounds a lot like trying to sort it out yourself. V2 or V3?
The Supersonic v2 is heavier (54g/39g), it draws a bit more with a 6x4 on 3s, but gets you a bit more thrust and speed... being a bigger motor it can cope with this slightly higher input without getting too hot.

If you wanted to get the same amount of power from the MicroJet v3 you'd have to use a slightly larger prop and push the 39g motor quite a bit harder....and it would probably run hotter.

If you are saving every gram in weight then obviously the MicroJet v3 is the answer... if the extra 15g for the Supersonic v2 doesn't matter too much...use the v2 and get a bit more power.

If you have the batteries to support it, get the 80g ARC 28-37-3 and have 300W+ on tap.

The HXT 2835-2200 mentioned above is a popular choice but it does weigh 105g.
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Old Feb 10, 2010, 07:42 AM
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There may be a heat sink available for the Turnigy 2835, but if there is, I'm not using it, and I don't think it's necessary on an EasyStar. I mean -- size and shape-wise, it's an easy, no-brainer, drop-in replacement for the stock Permax Speed 400 motor. The 2200 Kv version, with APC 6x4, turns the EasyStar into a speedster.

Considering that the plane's stock power system is around 80 watts, I can't see this motor running anywhere near its limits for more than a few seconds at a time. With the Turnigy, I'm at or below 30% throttle most of the time.

On my EasyStar, 3S/1800 shoved all the way forward gives perfect CG.
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Old Feb 10, 2010, 07:46 AM
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Quote:
Originally Posted by Dr Kiwi View Post
If you are saving every gram in weight then obviously the MicroJet v3 is the answer... if the extra 15g for the Supersonic v2 doesn't matter too much...use the v2 and get a bit more power.
15 grams on an EasyStar is nothin'.

Seriously, the thing has so much excess lift. Head over to the EasyStar forum to see what kind of they get loaded up with.

I gave away all my Permax Speed-400 motors, but if I recall properly, the HXT motor is still lighter than the stock motor, or not much heavier.
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Old Feb 10, 2010, 03:26 PM
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yeah, V2

Weight means nothing with flaps and gear. I'm actually running a 7x5 right now and putting around at 30-35%. It's the vertical I'm looking for, not so much raw speed.
I'd rather not do inrunner, my P400 is setup with a GWS black stickmount and the original motor hole is filled in with Great Stuff.
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Old Feb 10, 2010, 04:01 PM
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Here is my EasyStar motor: Suppo Blue 2212/6 (~2150Kv). Zagi prop. 3s 2100

10.7v, 20.50A, 218W, 20340rpom, 94.4mph, 608g, 21.41oz, 2.79g/W
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Old Feb 10, 2010, 08:57 PM
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Dash 9's Avatar
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Last question (I think)

So do you think the V2 will be able to handle a 7x5? Can or not I think that's what I'm gonna get.
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Old Feb 11, 2010, 10:04 AM
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You'll kill it with a 7x5 (perhaps 30A!)... even a 6x4 (24A+) is, IMHO, a bit too much.

Using the 3W/g rule, by rights this 54g motor should be kept to ~160W... but obviously it can cope with a bit more... but 300W+ is asking for trouble.
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