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Old Nov 25, 2012, 03:29 PM
I fly, therefore, I crash!!!
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San Jose, CA
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Trying kicking it up to 7:30 and see what happens....then if you still have plenty, then eight minutes...

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Old Nov 25, 2012, 04:29 PM
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United States, TX, San Antonio
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Trying kicking it up to 7:30 and see what happens....then if you still have plenty, then eight minutes...

SteveT
Thanks SteveT
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Old Nov 25, 2012, 08:55 PM
fly low be happy
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United States, CA, Shasta Lake
Joined Sep 2009
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Originally Posted by gapple12 View Post
OK, question. Ive been flying my Edge on 8S 4000 and 18x8 for a while with 7 minute flights and recently switched to 6S 5000 20x10 and like it much more. Locks into every maneuver better. Now, I'm flying 7 minutes like before and putting about 3300 back into the 5000 pack. Could I fly to 8 minutes since I have 1700 left in packs or is that pushing it to close ? Thanks !!
If it where my plane i would look at the voltage per cell after 7min, to help determine if I could fly longer.
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Old Nov 25, 2012, 09:05 PM
I fly, therefore, I crash!!!
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San Jose, CA
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That is actually what I meant, but forgot to say so...

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Old Nov 25, 2012, 09:08 PM
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Originally Posted by gapple12 View Post
OK, question. Ive been flying my Edge on 8S 4000 and 18x8 for a while with 7 minute flights and recently switched to 6S 5000 20x10 and like it much more. Locks into every maneuver better. Now, I'm flying 7 minutes like before and putting about 3300 back into the 5000 pack. Could I fly to 8 minutes since I have 1700 left in packs or is that pushing it to close ? Thanks !!
I always use the 80% rule. If I pull out more then 80% of the pack I need to back it down a notch. So for 5000 packs that means you can safely pull 4000 out. This allows your batteries to last longer and also gives you some added safety for in case of a missed approach.

Another way to get your timing down is to check your voltage per cell after each flight. I like to come down with 3.80-3.85 per cell.
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Old Nov 26, 2012, 09:05 AM
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United States, TX, San Antonio
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Originally Posted by Josef086 View Post
I always use the 80% rule. If I pull out more then 80% of the pack I need to back it down a notch. So for 5000 packs that means you can safely pull 4000 out. This allows your batteries to last longer and also gives you some added safety for in case of a missed approach.

Another way to get your timing down is to check your voltage per cell after each flight. I like to come down with 3.80-3.85 per cell.
Good info, thanks.......I was just about to ask about Voltage and how much to leave in the pack.
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Old Nov 26, 2012, 10:38 AM
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United States, MA, Lowell
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Originally Posted by gapple12 View Post
OK, question. Ive been flying my Edge on 8S 4000 and 18x8 for a while with 7 minute flights and recently switched to 6S 5000 20x10 and like it much more. Locks into every maneuver better. Now, I'm flying 7 minutes like before and putting about 3300 back into the 5000 pack. Could I fly to 8 minutes since I have 1700 left in packs or is that pushing it to close ? Thanks !!
Do you know how much thrust you were making with the 8S vs 6S? Do you do any 3D or mainly precision? I'm still trying to figure out the power system I want for my Edge. Been leaning toward 8S but I understand that is a heavier setup.
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Old Nov 26, 2012, 10:50 AM
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United States, MA, Lowell
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Originally Posted by Josef086 View Post
I always use the 80% rule. If I pull out more then 80% of the pack I need to back it down a notch. So for 5000 packs that means you can safely pull 4000 out. This allows your batteries to last longer and also gives you some added safety for in case of a missed approach.

Another way to get your timing down is to check your voltage per cell after each flight. I like to come down with 3.80-3.85 per cell.
I pretty much just look at the voltage per cell right after the flight, like you say here, to judge if I'm flying too long. But 3.80-3.85 seems pretty conservative. Yes, the batteries will last longer if you only discharge them to 3.80 but how much flight time could you be getting? I've always discharged down to 3.75 per cell and my batteries usually last about two flying seasons before I start to notice degradation. We're only getting 5-7 minutes per flight as it is.

Granted, I've only flown 3S and 6S planes up to 2200mah so far so I'm spending between $10 and $40 per battery. Even with HobbyKing batteries, the 74" Edge batteries will be $100, so I might not be able to afford beating up my batteries then.
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Old Nov 26, 2012, 10:52 AM
Byron C
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United States, TN, Knoxville
Joined Apr 2011
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Originally Posted by Neil_SC View Post
Do you know how much thrust you were making with the 8S vs 6S? Do you do any 3D or mainly precision? I'm still trying to figure out the power system I want for my Edge. Been leaning toward 8S but I understand that is a heavier setup.
Here's a handy motor/prop calculation tool that's helpful for comparing power / thrust / speed and etc. for various setups:

http://rcwebclub.com/PropEngine.aspx
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Old Nov 26, 2012, 10:58 AM
Irg
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Brooklyn, NY
Joined Apr 2009
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Originally Posted by Neil_SC View Post

Granted, I've only flown 3S and 6S planes up to 2200mah so far so I'm spending between $10 and $40 per battery. Even with HobbyKing batteries, the 74" Edge batteries will be $100, so I might not be able to afford beating up my batteries then.
if you're going to spend $100 on batteries for this plane, whether it be 2 4s packs to make 8s, or a single 6s 5000, do yourself a favor and try at least one set of either GensAce, SkyLipo, or Glacier from Epbuddy.com. the quality is much better and in my experience they deliver more even power over the course of the flight as well as more cycles per pack.

I used to be a HK battery buyer but after trying a few of the packs mentioned above, I won't be going back. the price difference is negligible especially when I consider how many HK packs I got that either had a bad cell out of the box or developed one after only a few cycles.

just my experience so far.
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Old Nov 26, 2012, 12:41 PM
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United States, LA, Moss Bluff
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I had some trouble with Gens ace, none have lasted over a year, actually less, much less. Hyperions for me.
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Old Nov 26, 2012, 12:54 PM
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Originally Posted by Neil_SC View Post
I pretty much just look at the voltage per cell right after the flight, like you say here, to judge if I'm flying too long. But 3.80-3.85 seems pretty conservative. Yes, the batteries will last longer if you only discharge them to 3.80 but how much flight time could you be getting? I've always discharged down to 3.75 per cell and my batteries usually last about two flying seasons before I start to notice degradation. We're only getting 5-7 minutes per flight as it is.

Granted, I've only flown 3S and 6S planes up to 2200mah so far so I'm spending between $10 and $40 per battery. Even with HobbyKing batteries, the 74" Edge batteries will be $100, so I might not be able to afford beating up my batteries then.
It all depends on how much I spent on the batteries and how big they are. With 6s I use the 3.80 per cell limit. If its like a small 3s or 2s I don't mind sucking more out of them.
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Old Nov 26, 2012, 01:22 PM
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United States, TX, San Antonio
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Originally Posted by Neil_SC View Post
Do you know how much thrust you were making with the 8S vs 6S? Do you do any 3D or mainly precision? I'm still trying to figure out the power system I want for my Edge. Been leaning toward 8S but I understand that is a heavier setup.
Not sure on thrust, but I fly 3D as well as a little precision and I like the 6S on Xoar 20x10 wood best. Ive tried 8S with a xoar 18x8 and 18x10. It flew it good and tons of power, but in my opinion the Edge needs more prop. I also tried a 19x8 and 19x10 with the 6S and still think the 20x10 is awesome. The plane just locks into everything better.
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Old Nov 27, 2012, 04:38 PM
I fly, therefore, I crash!!!
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San Jose, CA
Joined Jan 2008
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Last edited by SteveT.; Nov 27, 2012 at 11:55 PM.
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Old Nov 27, 2012, 06:35 PM
Registered User
United States, FL, Winter Springs
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351 Posts
UPS just droped off my new Edge (this is my first 7X size plane). Plane looks even more aweseome in person !!!!!
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