Espritmodel.com Telemetry Radio
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Old Sep 12, 2012, 12:30 AM
deltas are cool
AIR SALLY's Avatar
Tehachapi ,CA.
Joined Apr 2006
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I'll be home selling pumkins on sat
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Old Sep 13, 2012, 06:18 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
2,346 Posts
OK, what am I missing? I've put the battery (6S 5000) in. Shoved it as back as I could, but the CG is around 200mm, and not 280mm. What am I missing? I don't have anything special in the front. Did anyone put tail weight? Frankly, this looks like I'm going to need a whole lot of tail weight...
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Old Sep 13, 2012, 06:34 PM
Mil-Spec
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United States, CA, Los Alamitos
Joined Mar 2008
120 Posts
With my original 6s 4500 stock configuration no weight was needed to balance at 280 mm. When I went to 8s I needed tail weight so I added a 2s LiFe 1100 on the bottom behind the fan. I posted the mod somewhere in this thread. This model tends to be nose heavy, it has long moments so anything far up on the nose should be pushed as far back as possible.

My ESC is behind the fan too.
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Old Sep 13, 2012, 07:04 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
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I just measured and found that I need 0.66lb (10.5oz, or 300g) in the back...
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Old Sep 13, 2012, 09:03 PM
Mil-Spec
mcgoughman's Avatar
United States, CA, Los Alamitos
Joined Mar 2008
120 Posts
Y, what is the length of your batteries? Do you have a pic under the canopy with the battery installed? That seems like an excessive amount of weight to balance this model...
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Old Sep 14, 2012, 12:45 AM
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United States, CA, Palmdale
Joined Mar 2011
223 Posts
I'm a little nose heavy with 4000mah batterys and a 5 cell flight pack but it flies ok. Ive just got a little up trim in it , I'm thinking of moving the flight pack to the rear bottom of the plane and make a box for it like somebody else did earlier on the thread
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Last edited by rush1; Sep 16, 2012 at 09:11 PM.
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Old Sep 14, 2012, 03:08 AM
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Joined Jan 2010
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I'm flying mine on 12S, both in tandem as on pic and at the back of them is my 5cell, 2700mA, NMHi RX pack. I ballance it just a 'cat whisker' nose heavy at 275mm from LE. Joe.
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Old Sep 14, 2012, 05:19 AM
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Canada, ON, Burlington
Joined Jan 2009
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It is easy to cut more foam to allow the battery (s)to slide farther aft and still be supported by the stock plywood floor.
Cheers
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Old Sep 14, 2012, 06:14 AM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
2,346 Posts
Thanks guys. I'll do my best to let the batteries go as far back as possible, and then put weight in the tail to balance at 280mm.
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Old Sep 14, 2012, 07:44 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
2,346 Posts
Thanks for pushing me, guys. I did some moderate surgery on the top of the battery tray. I think I might need to reinforce that entire area. My guess is that fiberglass will not stick well to EPO? Now the battery can move as far back as possible, and to get the 280mm I only need 5.6oz (160g) in the tail. Much more manageable...
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Old Sep 15, 2012, 05:13 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
2,346 Posts
OK, I have cut 4 pieces of a weld bar (weighs 650g for 3'), and made room where the elevator servos were supposed to be (I moved them in front of the elevators) for them. I will next glue them in place.
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Old Sep 16, 2012, 02:15 AM
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Having great fun today flying my FF "F-100" and "F-4" in not the most favorable conditions when I have to land from the south clearing huge gum trees only 70 meters short off the strip. Each landing overshot, finishing in the creek, thanks being dry, after 10 weeks of no rain. See the follow up video, Joe.
video2 (3 min 46 sec)
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Last edited by jofro; Sep 16, 2012 at 04:06 AM. Reason: vid
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Old Sep 17, 2012, 05:30 PM
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rush1's Avatar
United States, CA, Palmdale
Joined Mar 2011
223 Posts
Well I made 20 flights this weekend on the Hun and I have to say its a big old trainer in the sky except it looks cool I think its time for some more power I'm using the C.S. 12 bld edf from xflight on 6s and I'm at 57 amps and 1670 watts thinking of changing out the esc as its only good for 6s and upping my batterys to 7 or 8s id like to get about 2000 watts reliably and cheaply . I did however race my buddys nitroplanes exceed F18 70mm and smoked him
Its funny I have the same power system on my cmp pro T45 and I get 67 amps and almost 1800 watts , Must be the better ducting on the T45 , I have to take the fan out and reballance it ,the edf in the T45 is whisper smoth and this one is a lot louder could it just be the foam ?
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Old Sep 17, 2012, 06:45 PM
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United States, TX, Grand Prairie
Joined Nov 2005
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Quote:
Originally Posted by rush1 View Post
Well I made 20 flights this weekend on the Hun and I have to say its a big old trainer in the sky except it looks cool I think its time for some more power I'm using the C.S. 12 bld edf from xflight on 6s and I'm at 57 amps and 1670 watts...
You must have the EPS version, it's a glider..foam isn't forgiving but the plane is in turns etc

Really thinking of getting that version but don't know who sells it.

Quote:
... and this one is a lot louder could it just be the foam ?
Do you feel any fingernail vibrations?

yes, it'll amplify in foam no doubt
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Old Sep 17, 2012, 07:55 PM
Another one on the way...
ysolomon's Avatar
Plano, Texas
Joined Feb 2009
2,346 Posts
Quote:
Originally Posted by rush1 View Post
Well I made 20 flights this weekend on the Hun and I have to say its a big old trainer in the sky except it looks cool I think its time for some more power I'm using the C.S. 12 bld edf from xflight on 6s and I'm at 57 amps and 1670 watts thinking of changing out the esc as its only good for 6s and upping my batterys to 7 or 8s id like to get about 2000 watts reliably and cheaply . I did however race my buddys nitroplanes exceed F18 70mm and smoked him
Its funny I have the same power system on my cmp pro T45 and I get 67 amps and almost 1800 watts , Must be the better ducting on the T45 , I have to take the fan out and reballance it ,the edf in the T45 is whisper smoth and this one is a lot louder could it just be the foam ?
How much does yours weigh?
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