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Jun 06, 2019, 08:19 AM
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royalstar05's Avatar
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Discussion

IMAC electric set up


I am flying in my first IMAC competition the weekend and I will be flight the Beast 60E biplane has the e flite 60B 470KV I am having trouble with my prop selection looking at 15X8, 15X10, or 16X8 I have it flying on 6S 4500 40C a couple of questions first now the plane is set up with the 16X8 and I get 5minutes of flight time land check battery and have 3.80 per cell left. I want to be sure my watts per pound is in the ballpark also with my set up now its 1.49 watts per pound. I can leave this along because of a rule that electric can land and change battery before started my 2nd pass of the routine. I would like to have it set up so I do not have to do this. I can go to 6S 5000 40C but will have to rebalance plane any suggestions
Thank you
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Jun 07, 2019, 08:18 AM
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What class are you flying in?
If basic I would say use a large enough battery and adjust the CG.
If you want to keep flying electric, before compromising a prop you don’t like, I would recommend finding the largest mah battery you can live with that weighs the least. For example, I fly a 6s 4400 that ways just a little less than most 4000s from other companies.
Jun 07, 2019, 06:36 PM
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koppterX's Avatar
I seriously doubt you would even be able to tell the difference in the CG. go out and have fun.
Jun 08, 2019, 07:43 AM
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Quote:
Originally Posted by royalstar05
I am flying in my first IMAC competition the weekend and I will be flight the Beast 60E biplane has the e flite 60B 470KV I am having trouble with my prop selection looking at 15X8, 15X10, or 16X8 I have it flying on 6S 4500 40C a couple of questions first now the plane is set up with the 16X8 and I get 5minutes of flight time land check battery and have 3.80 per cell left. I want to be sure my watts per pound is in the ballpark also with my set up now its 1.49 watts per pound. I can leave this along because of a rule that electric can land and change battery before started my 2nd pass of the routine. I would like to have it set up so I do not have to do this. I can go to 6S 5000 40C but will have to rebalance plane any suggestions
Thank you
Can you post a picture of how your batteries are mounted in the airframe, focus on room around the pack fore/aft?

Going from 4500mAh to 5000mAh on a 6S could add approx 40 to 50 grams depending on the manufacture. If the batteries are close to CG, no worries. If they are close to the nose or aft of CG, it may change the flight characteristics slightly.

The key is to ensure you are in the design CG range. If yes, just go fly it and have fun. If not, all you may need to do is shift the battery pack towards CG a bit until you are good, most likely less than 1/4 inch (12mm) depending on where the battery pack is currently located in the airframe.
Jun 12, 2019, 08:18 PM
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gobigdave's Avatar
I had a Beast 60e for a while, and I ran a 6S 5000mah pack with a 17x7 prop. I could easily get 7 minutes of hard sport flying. That should be more than enough for 2 times through a Basic sequence. I was using the Potenza 60 motor, which is the same 470kv.

My pack was back towards the receiver. CG was pretty neutral, if not slightly nose heavy. That’s great for IMAC.
Jun 18, 2019, 01:49 PM
"I will return" Federico
rclad's Avatar
Here's a look at e-Calc with 6S 6000s on board for over 7 minutes flying time. Always throttle down at the top of tall maneuvers, like the Humpty Bump., to get maximum flight time. The wing cube loading (WCL) is so light, the extra 4 ounces you gain going to 6000 mAh still keeps you to a WCL of 7.4 (assuming max weight of 157 ounces). That is very light and floaty. See PDF for eCalc results.
Jun 19, 2019, 08:45 AM
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royalstar05's Avatar
Thread OP
thank you for your advise I am working on a build now extreme flight MXS 83" going to fly on 10S 4500mah using a Scorpion s11 5525 195kv motor any prop ideas
Last edited by royalstar05; Jun 19, 2019 at 08:50 AM.
Jun 19, 2019, 04:12 PM
"I will return" Federico
rclad's Avatar
What is your all up weight (AUW)? At 13 lbs (WCL of 8.1) an APC-E 20x11 would give you more than 8 minutes with thrust to weight of 1.49:1, which is good for IMAC.
Jun 19, 2019, 07:54 PM
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gobigdave's Avatar
If you’re going to 83”, I recommend you try for 12S to keep your amps down. I once had 6S in a 70” EF Extra. Flew great, but flight times were pretty short. Also, my batteries cried “Uncle!” pretty quickly when full throttle meant > 100amps. Rewound the motor and switched to 8S, and it was a different plane. More power, longer flight times, and the weight was pretty much the same due to smaller capacity packs.

Sold the plane to a buddy, and he bumped it up to 12S. Now the thing is insane!


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