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Old May 07, 2012, 07:52 PM
But I am learning
I_Can't_Fly's Avatar
USA, MD, Cumberland
Joined Apr 2008
1,047 Posts
Thanks Rick, that helped answer both questions.

Brian P.
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Old May 08, 2012, 10:51 AM
Time for me to Fly...
Mr. Wiz's Avatar
United States, MI, Fenton
Joined Jan 2000
8,663 Posts
I flew the Fr3aK again this morning. This time it was sunny and there was some nice lift. The #1 thing I'm going to do before the next outing is add some white stripes to the wing bottom. I kept getting disoriented with it because the wing looks the same on top as bottom. I also think a colored fin would help.

After that, I want to try moving the CG rearward a little. I felt like I constantly had to hold in elevator to keep the nose up or trim it so it pulled too hard up on launch. My launches felt different today too. I think I'm going to lose the glove when flying this plane. The blade is comfortable enough without it.

Mostly, it's just a different plane and it's going to take some time to get adjusted to it.
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Old May 10, 2012, 11:14 AM
Blind Hawk
rdjay's Avatar
Seattle, WA USA
Joined Dec 2006
1,224 Posts
Tom,

I'm moving some of my gear around and want to use a 320 mah, 2s Hyperion battery in the nose. It fits, but the taper of fuse at the front restricts how far forward and I'd like to get it 1/4" or so further so I can fit in the rest of my gear.

I'm wondering if it would be possible to re-shape the nose slightly. I'm thinking I could make a wood "plug" the size of the battery, warm the end of the fuse in some boiling water and push the plug forward to stretch it out a bit.

Crazy? Stupid? Doable? What do you think?

Thanks, Rick
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Old May 10, 2012, 11:38 AM
Father of Fr3aK, DLG Pilot
tom43004's Avatar
USA, OH, Worthington
Joined May 2002
6,770 Posts
Very likely will split the seam. Kevlar doesn't stretch and there's not a lot of seam overlap up there. Get one of the 350 or 360 Rhino or Zippy packs... they slide WAAAY up in there. If you need a couple I can mail you some.
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Old May 10, 2012, 11:40 AM
ground penetration specialist
Nathan Schmoekel's Avatar
USA, MI, Grand Rapids
Joined Apr 2007
1,819 Posts
Opinion

Warping such a beautiful, well made fuse is crazy talk

What servos are you using? I'll wager that your two servos, the tray and the glue to hold it all probably weighs the same if not a titch more than that battery...

Possible solution : Regulator and receiver in the nose, servos at the front of the canopy opening and the battery behind the servos?
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Old May 10, 2012, 11:53 AM
Blind Hawk
rdjay's Avatar
Seattle, WA USA
Joined Dec 2006
1,224 Posts
You guys are right, it was crazy talk.

I've been using the 360's and they fit nicely. I'm trying to get my RX in the nose on top of the battery and the 360's are just a bit to thick. They 320 Hyperions are thinner but wider so they don't go as far forward and get in the way of my PD regulator. I was looking for an easy way without moving my servo tray and/or regulator.

Maybe I'll just squish the end of the battery in my vise, you know put a taper on the end of it....... Just kidding...

RdJay
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Old May 10, 2012, 11:56 AM
Time for me to Fly...
Mr. Wiz's Avatar
United States, MI, Fenton
Joined Jan 2000
8,663 Posts
I know I sound like a broken record but the Shread 450 fits in the nose with all kinds of room to spare. I can get a solid 2 hours of flying out of that system but YMMV. I should post a photo of the inside of my pod just to show people. I think I will do that this evening.
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Old May 10, 2012, 07:38 PM
Will fly for food
davidjensen's Avatar
Bellevue WA,
Joined Dec 2003
7,084 Posts
Where do you get the Shread stuff?
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Old May 10, 2012, 07:48 PM
Registered User
jbarnhardt's Avatar
United States, WA, Seattle
Joined May 2011
543 Posts
Quote:
Originally Posted by davidjensen View Post
Where do you get the Shread stuff?
http://www.kennedycomposites.com/batteries.htm#
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Old May 11, 2012, 07:14 AM
Father of Fr3aK, DLG Pilot
tom43004's Avatar
USA, OH, Worthington
Joined May 2002
6,770 Posts
Wow. I pay $4 for my LiPos and make my own regulators.

I'm sure they're good stuff but jeesh!
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Old May 11, 2012, 08:58 AM
In F3J size does matter!
roydor's Avatar
Israel
Joined Nov 2006
865 Posts
Quote:
Originally Posted by tom43004 View Post
I'm sure they're good stuff but jeesh!
+1

Also, when considering the power available, 2S 350mAh batteries have 1.5 times more power then 450 mAh 1 cell batteries (3.7V*0.45Ah=1.665 Wh Vs. 3.7V*2*0.35Ah=2.59Wh) which translates to grater flying time (even after taking into account the efficiency of the regulators)
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Last edited by roydor; May 11, 2012 at 09:47 AM.
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Old May 11, 2012, 09:00 AM
Registered User
Therwil, BL, Switzerland
Joined Nov 2006
85 Posts
Please try to keep the units correct: 3.7 V * 0.45 Ah = 1.665 Wh
(sorry, pet peeve)
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Old May 11, 2012, 09:48 AM
In F3J size does matter!
roydor's Avatar
Israel
Joined Nov 2006
865 Posts
I always forget that little "h"
corrected
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Old May 11, 2012, 11:00 AM
Time for me to Fly...
Mr. Wiz's Avatar
United States, MI, Fenton
Joined Jan 2000
8,663 Posts
Quote:
Originally Posted by tom43004 View Post
Wow. I pay $4 for my LiPos and make my own regulators.

I'm sure they're good stuff but jeesh!
For what it's worth, they are far more than just a battery and a regulator. I've kind of beat this one to death here but when I see you next time I'll show it to you. I'll just say it's a very convenient system is a tiny package.... and yeah, you pay for the convenience.
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Old May 11, 2012, 11:36 AM
a.k.a. Matt Nelson
MattN's Avatar
North Tustin, CA
Joined Oct 2008
1,815 Posts
Quote:
Originally Posted by Mr. Wiz View Post
For what it's worth, they are far more than just a battery and a regulator. I've kind of beat this one to death here but when I see you next time I'll show it to you. I'll just say it's a very convenient system is a tiny package.... and yeah, you pay for the convenience.
I'm with Tom on this one - but go one further. A cheap one-cell LiPo with no regulator/booster. I like eliminating components connectors, and wires (= potential points of failure).
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