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Post by alaskaflyer on Feb 3, 2011 7:32:04 GMT 1
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Post by cubflyercameron on Feb 3, 2011 9:12:04 GMT 1
I had a look at this motor and it seems to be the same as the Turnigy 35 30C outrunner that is a popular upgrade for the super cub. If you wanted you could get the motor off of Hobbyking for $18 I Think it is, and pick up a Turnigy Plush 30A for around $12, and make a mount by cutting off the shaft housing of the stock motor gearbox and putting a bit of ply on to that to retain the correct thust angle, then by putting spacers between the X mount and the mount, you then have a brushless upgrade, just like the kit for less that half the price.
Cameron
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Post by Dillzio on Feb 3, 2011 9:22:28 GMT 1
Don't even bother. That motor looks pretty crap for one thing, it doesn't look like the right thrust angle either. You'd be much better off buying a motor from hobbyking, giantCOD or plus2city, and getting an aluminium motor mount from custom RC parts, then you'll have a much better setup and it will cost you less money.
The data they provide as 'evidence' that their setup is better than stock is total bullcrap too. Notice that they're comparing a stock motor running at 7.9v to their motor running at 10.7v. It's no great surprise that giving a motor an extra 2.8 volts is going to produce more power.
They also state that their kit is 2oz less than the stock setup. All that's going to do is make the plane tail heavy, you'd have to add another 2oz to the nose to balance it out anyway. I think I might message that seller to take the pi$$ out of him a bit :-)
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Post by killioughtta on Feb 3, 2011 11:45:12 GMT 1
looks like a crap can motor to me. I've never even seen a BL motor that looks like that. Go to headsuprc.com and get a 35-30, 30 amp ESC and a prop and make your own motor mount or buy a $20 one from ebay and it'll still be cheaper.
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Post by killioughtta on Feb 3, 2011 11:49:31 GMT 1
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Post by killioughtta on Feb 3, 2011 12:01:29 GMT 1
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Post by Dillzio on Feb 3, 2011 12:13:54 GMT 1
This is the message I sent to that ebay seller. I'll post his reply (if I get one)
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Hi,
I'm interested in buying your brushless motor setup for my cub, but a friend has warned me that the setup might not be any good for me. I wanted to check with you if any of what my friend has told me is true or not.
The first think I was warned about is the weight of your kit, you say that it's 2.25oz lighter than the stock motor. My friend has warned me that by putting a lighter motor in the cub, the cub will become unbalanced and tail heavy. Is this true?
The other thing my friend pointed out is that your power comparison table seems to be a bit misleading. In the table, you are comparing a stock motor running at 7.9v to your motor running at 10.7v. Isn't it obvious that a motor will be putting out less thrust if you are running it at a lower voltage? If this is true, it suggests that your motor may only seem more powerful than the stock motor because it's being run at a higher voltage. Is there any particular reason you're comparing motors at different voltages?
many thanks,
-Dillzio
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Post by ginginho on Feb 3, 2011 14:03:17 GMT 1
Haha, that's not the most professional upgrade kit I've seen. I wonder if the seller is/has been on here? I love the description of the function of a BEC too, "BEC allows your servos to keep functioning even if you run out of battery for the motor"
Erm, hello? I think it does a little more than that! If not, what servos does he have that run on 12v? They'd be mighty quick, but so would their demise.
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Post by alaskaflyer on Feb 3, 2011 20:17:11 GMT 1
I think I am going to go with option 1. I just want a faster flight and better climb, after getting the motor taken care of then I am wanting some ailerons.
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Post by Dillzio on Feb 4, 2011 4:30:07 GMT 1
This is the message I sent to that ebay seller. I'll post his reply (if I get one) --- Hi, I'm interested in buying your brushless motor setup for my cub, but a friend has warned me that the setup might not be any good for me. I wanted to check with you if any of what my friend has told me is true or not. The first think I was warned about is the weight of your kit, you say that it's 2.25oz lighter than the stock motor. My friend has warned me that by putting a lighter motor in the cub, the cub will become unbalanced and tail heavy. Is this true? The other thing my friend pointed out is that your power comparison table seems to be a bit misleading. In the table, you are comparing a stock motor running at 7.9v to your motor running at 10.7v. Isn't it obvious that a motor will be putting out less thrust if you are running it at a lower voltage? If this is true, it suggests that your motor may only seem more powerful than the stock motor because it's being run at a higher voltage. Is there any particular reason you're comparing motors at different voltages? many thanks, -Dillzio I got a reply from the seller. He seems like a nice chap, but his knowledge of the electronics of the stock cub leaves a lot to be desired. This was his reply: ---
Hi, You are right, the kit is lighter than stock, which is good cause you need less energy to move less weight. Now I you used the exact same battery then you might have to add some weight to balance it but given that you most likely will use a bigger LIPO battery then usually that takes care of the problem. I modified the battery case so it can fit a 2500mah battery and with the efficiency of the brushless motor you can fly up to 30+ non-stop... Even if you need to add some weight the flying characteristics with the upgraded motor are so much better that weight shouldn't be an issue at all...
I see what you mean... the problem is that the motors are totally different... Meaning you just can't run your stock motor at 10.7 cause it will blow up in 2 flights... Also the upgrade is a Brushless motor while the stock is Brushed... so the upgraded motor is much more efficent and has almost no wear overtime while the brushed wiil start sputtering after prolonged use as the brushes wear out and you eventually need to replace it. The stock motor will just never be able to achieve the power numbers of the brushless as it wasn't designed for that... the brusheless can do that cause of the better design and also the ability to run at a higher voltage I'm comparing those cause if you put 2 motors with the same voltage then you would not gain much on power... the upgrade wouldn't make sense... Hope my answers help... Let me know if you have any other question Regards,--- His notion that the stock motor would fry at 10.7 volts is interesting. I thought I'd have a bit more fun with the guy so this is what I wrote back: --- Hi there, thank you for your quick response. I see now the advantages of having a lighter setup, and how it allows you to use a bigger battery for longer flight times. Regarding the stock motor not being able to run at 10.7v, I think you're mistaken there. I have a Super Cub LP, which has exactly the same motor as the original super cub. The super cub LP runs off a 3S lipo at about 12v, and I've had dozens of flights without the motor burning out. You say that if the motors were run at the same voltage you would not gain much on power, does this mean that the main advantage of your kit is the reduced weight and reduced wear of the motor? Many thanks for your help, -Dillzio |
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