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Author Topic: Cobra 3515/18  (Read 5808 times)

Offline RC Storick

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Cobra 3515/18
« on: December 26, 2013, 04:30:54 PM »
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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Offline Dean Pappas

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Re: Cobra 3515/18
« Reply #1 on: December 26, 2013, 07:32:50 PM »
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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Offline Avaiojet

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Re: Cobra 3515/18
« Reply #2 on: December 27, 2013, 05:22:24 PM »
Quote from: Robert  Storick on December 26, 2013, 04:30:54 PM
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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Offline Allan Perret

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Re: Cobra 3515/18
« Reply #3 on: December 28, 2013, 09:07:14 AM »
Quote from: Dean Pappas on December 26, 2013, 07:32:50 PM
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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Offline Avaiojet

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Re: Cobra 3515/18
« Reply #4 on: January 02, 2014, 11:58:11 AM »
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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Offline RC Storick

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Re: Cobra 3515/18
« Reply #5 on: January 03, 2014, 08:00:58 PM »
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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Offline Avaiojet

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Re: Cobra 3515/18
« Reply #6 on: January 03, 2014, 09:06:02 PM »
Quote from: Robert  Storick on January 03, 2014, 08:00:58 PM
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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Offline RC Storick

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Re: Cobra 3515/18
« Reply #7 on: January 03, 2014, 09:37:01 PM »
Quote from: Avaiojet on January 03, 2014, 09:06:02 PM
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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Offline Avaiojet

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Re: Cobra 3515/18
« Reply #8 on: January 04, 2014, 07:01:04 AM »
Quote from: Robert  Storick on January 03, 2014, 09:37:01 PM
Google Thunderpower 5S 2700 they are pricey at 99.00 each

Thank you Robert.

Charles
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Offline Darkstar1

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Re: Cobra 3515/18
« Reply #9 on: January 04, 2014, 07:46:27 AM »
Quote from: Robert  Storick on January 03, 2014, 09:37:01 PM
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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Offline RC Storick

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Re: Cobra 3515/18
« Reply #10 on: January 04, 2014, 07:59:54 AM »
Quote from: Darkstar1 on January 04, 2014, 07:46:27 AM
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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Offline Avaiojet

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Re: Cobra 3515/18
« Reply #11 on: January 04, 2014, 08:09:40 AM »
Quote from: Robert  Storick on January 04, 2014, 07:59:54 AM

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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Offline RC Storick

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Re: Cobra 3515/18
« Reply #12 on: January 04, 2014, 08:12:27 AM »
Quote from: Avaiojet on January 04, 2014, 08:09:40 AM
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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Offline Avaiojet

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Re: Cobra 3515/18
« Reply #13 on: January 04, 2014, 08:22:33 AM »
Quote from: Darkstar1 on January 04, 2014, 07:46:27 AM
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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Offline Zuriel Armstrong

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Re: Cobra 3515/18
« Reply #14 on: January 04, 2014, 10:10:08 AM »
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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Offline Darkstar1

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Re: Cobra 3515/18
« Reply #15 on: January 04, 2014, 12:38:03 PM »
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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Offline Avaiojet

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Re: Cobra 3515/18
« Reply #16 on: January 04, 2014, 02:18:23 PM »
Quote from: Darkstar1 on January 04, 2014, 12:38:03 PM
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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Offline Crist Rigotti

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Re: Cobra 3515/18
« Reply #17 on: January 04, 2014, 03:56:21 PM »
Quote from: Darkstar1 on January 04, 2014, 07:46:27 AM
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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Offline Avaiojet

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Re: Cobra 3515/18
« Reply #18 on: January 04, 2014, 04:14:04 PM »
Quote from: Crist Rigotti on January 04, 2014, 03:56:21 PM
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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Offline Darkstar1

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Re: Cobra 3515/18
« Reply #19 on: January 04, 2014, 06:34:07 PM »
Quote from: Avaiojet on January 04, 2014, 02:18:23 PM
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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Offline Avaiojet

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Re: Cobra 3515/18
« Reply #20 on: January 04, 2014, 09:08:27 PM »
Quote
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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Offline RC Storick

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Re: Cobra 3515/18
« Reply #21 on: January 05, 2014, 12:32:16 AM »
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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Offline Darkstar1

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Re: Cobra 3515/18
« Reply #22 on: January 05, 2014, 04:30:30 AM »
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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Offline Allan Perret

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Re: Cobra 3515/18
« Reply #23 on: January 05, 2014, 09:13:55 PM »
Quote from: Robert  Storick on January 05, 2014, 12:32:16 AM
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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Offline RC Storick

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Re: Cobra 3515/18
« Reply #24 on: January 05, 2014, 10:14:19 PM »
Beats me? I think cause they know I want them. LOL
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Offline Avaiojet

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Re: Cobra 3515/18
« Reply #25 on: January 06, 2014, 05:28:35 AM »
Quote from: Allan Perret on January 05, 2014, 09:13:55 PM
Why the big difference in price ?

Size and weight.
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Offline Alan Resinger

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Re: Cobra 3515/18
« Reply #26 on: January 06, 2014, 12:17:24 PM »
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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Re: Cobra 3515/18
« Reply #27 on: January 19, 2014, 09:11:21 AM »
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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Offline Allan Perret

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Re: Cobra 3515/18
« Reply #28 on: June 29, 2014, 01:05:39 PM »
Have you flown the Cobra 3515/18 yet ?
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Offline RC Storick

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Re: Cobra 3515/18
« Reply #29 on: June 29, 2014, 03:46:03 PM »
Quote from: Allan Perret on June 29, 2014, 01:05:39 PM
Have you flown the Cobra 3515/18 yet ?

Yes it works great!
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