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Electric Stunt => Gettin all AMP'ed up! => Topic started by: RC Storick on December 26, 2013, 04:30:54 PM
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I just got my bigger motor. I want to be able to swing a 13 inch prop and I have been told the small frame motors should not run a prop that large. The motor is 740 KV and .10 lighter than the AXI 2826/12.
The front bearing appears to be around 1/2 inch. I will report how this motor performs when the MC73 is done.
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Happy New Year, Sparky
I don't see why this motor won't do nicely on a 13 inbch prop with a 5S battery.
Granted, you'd probably over-dissipate the motor on a 72 ounce airframe ... but I know there ain't a snowball's chance you'll show up with one of those!
later,
Dean P.
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I just got my bigger motor. I want to be able to swing a 13 inch prop and I have been told the small frame motors should not run a prop that large. The motor is 740 KV and .10 lighter than the AXI 2826/12.
The front bearing appears to be around 1/2 inch. I will report how this motor performs when the MC73 is done.
Are you sure you made the correct choice?
RPM? Thrust?
Charles
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Happy New Year, Sparky
I don't see why this motor won't do nicely on a 13 inbch prop with a 5S battery.
Granted, you'd probably over-dissipate the motor on a 72 ounce airframe ... but I know there ain't a snowball's chance you'll show up with one of those!
later,
Dean P.
"over-dissipate" ???
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How heavy is your model Robert?
Saving .1 oz.
You can trim a full once with choices like the following AXI:
2820/14
2820/12
And, if you dial down to a tad smaller prop, you can save weight there also.
I read someplace where it all adds up.
Charles
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I do not design around the motor I design around the King battery. I use a 5 cell because its the lightest (10 OZ) so I need to choose a motor with the correct KV rating. Not choose a motor and then the battery and get stuck using a 4 cell 14 ounce battery.
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I do not design around the motor I design around the King battery. I use a 5 cell because its the lightest (10 OZ) so I need to choose a motor with the correct KV rating. Not choose a motor and then the battery and get stuck using a 4 cell 14 ounce battery.
I understand. What does your battery pack measure and who sells it?
Charles
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I understand. What does your battery pack measure and who sells it?
Charles
Google Thunderpower 5S 2700 they are pricey at 99.00 each
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Google Thunderpower 5S 2700 they are pricey at 99.00 each
Thank you Robert.
Charles
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Google Thunderpower 5S 2700 they are pricey at 99.00 each
Sparky,
I assume you are talking about the latest gen of the batteries. If U go to Thunderpower's site directly
U can get the previous gen batteries 5s 2700 30c for 43.99. I have four on the way now.
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Sparky,
I assume you are talking about the latest gen of the batteries. If U go to Thunderpower's site directly
U can get the previous gen batteries 5s 2700 30c for 43.99. I have four on the way now.
5S 25C 2700 not the 30C. If you have a link to a 10 ounce 2700 MAH 25 C battery for 43.00 dollars please post it. I have 5 batteries now but could use more at 43.00 dollars.
This is the battery I use from their site. http://www.thunderpowerrc.com/Specials?search=5s+2700+25c
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5S 25C 2700 not the 30C. If you have a link to a 10 ounce 2700 MAH 25 C battery for 43.00 dollars please post it. I have 5 batteries now but could use more at 43.00 dollars.
This is the battery I use from their site. http://www.thunderpowerrc.com/Specials?search=5s+2700+25c
Robert, I went all through the Thunder Power site.
This is what I came up with:
2700mAh 5-Cell/5S 18.5V G8 Pro Lite+ 25C LiPo
Measures: 40 x 34 x 102
Weighs: 290g - 10.23 oz.
Is this the battery of your choice?
Thanks
Charles
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Robert, I went all through the Thunder Power site.
This is what I came up with:
2700mAh 5-Cell/5S 18.5V G8 Pro Lite+ 25C LiPo
Measures: 40 x 34 x 102
Weighs: 290g - 10.23 oz.
Is this the battery of your choice?
Thanks
Charles
that's it. I choose this only because of its weight. Battery first ,motor second, design plane around that. IMHO
I do not espire to the design plane choose drive train and add weight to balance theory. It helps tp know your fixed weights first.
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Sparky,
I assume you are talking about the latest gen of the batteries. If U go to Thunderpower's site directly
U can get the previous gen batteries 5s 2700 30c for 43.99. I have four on the way now.
Darkstar1,
Don't underestimate the power of the Force.
I believe the 5S 30c pack, you are referring to, weighs 335g. That's 11.83 onces. A considerable difference than what Robert is using.
My personal interest would be the lighter battery pack.
Charles
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Robert,
I'm interested in how your 3515-18's perform. I bought two of them while they were on sale. I bought one from Monto RC for $29.95.
Zuriel
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Sparky,
Thanks for clarifying for me. But for me those 5s 30c batteries are a bit lighter as the latest gen 6s 2700 25c batteries. I can use two different motors (720 & 640 kv) in a Infinity airframe and the plane will weigh about the same. (around 60-61 oz.) When I bought them before they were more than twice the price and was only 25c before.
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Sparky,
Thanks for clarifying for me. But for me those 5s 30c batteries are a bit lighter as the latest gen 6s 2700 25c batteries. I can use two different motors (720 & 640 kv) in a Infinity airframe and the plane will weigh about the same. (around 60-61 oz.) When I bought them before they were more than twice the price and was only 25c before.
Darkstar1,
Turning a larger prop? What motors would that be?
Charles
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Sparky,
I assume you are talking about the latest gen of the batteries. If U go to Thunderpower's site directly
U can get the previous gen batteries 5s 2700 30c for 43.99. I have four on the way now.
Can you provide a link? I've looked at their website and can't find them. Thanks.
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Can you provide a link? I've looked at their website and can't find them. Thanks.
Christ,
No photo, bottom left, you'll see the text.
http://www.thunderpowerrc.com/2700-mAh
Charles
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Darkstar1,
Turning a larger prop? What motors would that be?
Charles,
Still turning APC 13 x 4.5 F2B. The motors are the Pletty 20-16 & 25-14
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Charles,
Still turning APC 13 x 4.5 F2B. The motors are the Pletty 20-16 & 25-14
Darkstar!,
I figured that. Bet your turning it clockwise.
That's my goal, to spin a 13 x 4 prop. Clockwise also.
Are there many guys spinning a prop that size?
Charles
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Specs on the 30C
2700mAh 5-CELL/5S 18.5V PRO POWER 30C LIPO
Specifications:
Max Charge: 5C
Max Charge Current: 13.5A
Max Cont. Discharge: 30C
Max Cont. Current: 81A
Max Burst: 60C
Max Burst Current: 162A
Weight (g): 335
Dimensions (mm): 38 x 39 x 116
Price $44.17
Specs on the 25C
Product Description
2700mAh 5-Cell/5S 18.5V G8 Pro Lite+ 25C LiPo
Specifications:
Max Charge: 5C
Max Charge Current: 13.5A
Max Cont. Discharge: 25C
Max Cont. Current: 67.5A
Max Burst: 50C
Max Burst Current: 135A
Weight (g): 290
Dimensions (mm): 40 x 34 x 102
Price: $98.99
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Charles,
The APC 13 x 4.5 F2B pusher is used by several fliers out there. I tried several props all two blade so far and the APC
for me seems to be the leader in the clubhouse. Of course that depends on what you are flying.
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Specs on the 30C
2700mAh 5-CELL/5S 18.5V PRO POWER 30C LIPO
Specifications:
Max Charge: 5C
Max Charge Current: 13.5A
Max Cont. Discharge: 30C
Max Cont. Current: 81A
Max Burst: 60C
Max Burst Current: 162A
Weight (g): 335
Dimensions (mm): 38 x 39 x 116
Price $44.17
Specs on the 25C
Product Description
2700mAh 5-Cell/5S 18.5V G8 Pro Lite+ 25C LiPo
Specifications:
Max Charge: 5C
Max Charge Current: 13.5A
Max Cont. Discharge: 25C
Max Cont. Current: 67.5A
Max Burst: 50C
Max Burst Current: 135A
Weight (g): 290
Dimensions (mm): 40 x 34 x 102
Price: $98.99
Why the big difference in price ?
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Beats me? I think cause they know I want them. LOL
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Why the big difference in price ?
Size and weight.
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The reason they are cheaper is that they are Generation 4 batteries as opposed to the improved chemistry Generation 8 batteries. They are "close outs".
Alan
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Robert,
Did you ever get any time on this motor? As stated, I bought two of them and would love some feedback....hopefully positive.
Zuriel
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Have you flown the Cobra 3515/18 yet ?
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Have you flown the Cobra 3515/18 yet ?
Yes it works great!