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Old Dec 21, 2011, 11:13 PM
MultiCopterPilot & Film Maker
crazyj's Avatar
United States, CA, San Ramon
Joined Nov 2002
2,545 Posts
Here is my friend's (Karl S.) Fun Jet Ultra that was clocked at 163 mph, and we know it can do better than that, since this was only the first flight!

Karl's Fun Jet Ultra - 163 Mph (0 min 42 sec)



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Old Dec 22, 2011, 12:00 AM
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xxxcellarator's Avatar
Toronto, Canada
Joined Nov 2009
656 Posts
Yeah right! not if ur comparing it to a Ferrari Enzo! Price ratio is exactly the same as in our situation
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Old Dec 22, 2011, 02:06 AM
"Every boy has a dream to fly"
Airplanekid333's Avatar
Fort Collins Colorado
Joined Sep 2009
510 Posts
in my 2 year experience with RC, this is the first time I've been up to 6cell. I burned my finger from touching the esc during my 2 minute run up test, to make sure everything is running smoothly. Everything is doing great, but there is a lot of heat. Im sure this is normal for 6S correct?
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Old Dec 22, 2011, 02:30 AM
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Jurgen Heilig's Avatar
53859 Niederkassel, Germany
Joined Sep 2000
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Quote:
Originally Posted by Airplanekid333 View Post
in my 2 year experience with RC, this is the first time I've been up to 6cell. I burned my finger from touching the esc during my 2 minute run up test, to make sure everything is running smoothly. Everything is doing great, but there is a lot of heat. Im sure this is normal for 6S correct?
Heat is not directly related to the number of cells, but a function of the current. Heat losses = I² (current squared) x R (esistance).

If you are running high currents, your battery, ESC, motor etc. should be up to it.

Jürgen
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Old Dec 22, 2011, 02:38 AM
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United States, CA, SF
Joined Mar 2008
3,861 Posts
Airplanekid333,

2 minutes static test???

Normal static test should be about 3 seconds, maybe 4 seconds at most!!! (pending setup and relative AMPs).

Maybe even couple extra seconds longer if it is KV test.

______________

Part throttle heats up the ESC a LOT more compared to being full throttle.


If you did a 2 minute static test at varying throttle settings, it is possible to have damaged your ESC. Cross your fingers.


I did a rookie move (and posted about it) a few years ago. Most of my FET chips slid off the board and one of the main fat wires also became de-soldered and moved over and got itself soldered on elsewhere.
***Part throttle static test can spell disaster and destruction to ESC....mine was a new Castle Phoenix 80A ESC, and draw was in the 60-70A range (5S).
Told Castle Creations the truth and tried to pay for repair, But the Castle tech didn't let me pay.

________________

xxxcellarator,

I don't agree with you, but it does not matter. We don't have to be in agreement.


Gryphon
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Old Dec 22, 2011, 04:54 AM
Why the dirt on the wings?
moparmyway's Avatar
New York
Joined Jan 2009
4,999 Posts
Quote:
Originally Posted by Airplanekid333 View Post
in my 2 year experience with RC, this is the first time I've been up to 6cell. I burned my finger from touching the esc during my 2 minute run up test, to make sure everything is running smoothly. Everything is doing great, but there is a lot of heat. Im sure this is normal for 6S correct?
I would suggest you plug everything together, give a quick 2 second no load at home. If everythings fine, go to the field, NO more testing. Fly it with your 6 cell setup. If it held together for 2 minutes on the ground, it should fly (unless you already damaged something, which is why I suggested the 2 second no-load @ home). Is this the same ESC that got hot before ? http://www.rcgroups.com/forums/showp...postcount=4277


Which motor ? Turnigy 3648 ?
What ESC ? Hobby King 90-100 amp ESC ?
What battery ? 6s2200 (30/60) ?
What prop ?
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Old Dec 22, 2011, 10:26 AM
"Every boy has a dream to fly"
Airplanekid333's Avatar
Fort Collins Colorado
Joined Sep 2009
510 Posts
it is the 3648 with 90-100amp, on 2200 30c, turning APC 7X6. yes it is the same esc that got hot and its still living. Im charging right now to see how much Mah was used during the 2 minutes at half throttle with the prop on. Now i know not to do that again and only do it for 5 seconds now. Thank you
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Old Dec 22, 2011, 10:26 AM
"Every boy has a dream to fly"
Airplanekid333's Avatar
Fort Collins Colorado
Joined Sep 2009
510 Posts
I will update my maiden flight on christmas day. Cheers
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Old Dec 22, 2011, 07:41 PM
"The Judge"
sebbe's Avatar
Sweden
Joined Feb 2006
5,817 Posts
Quote:
Originally Posted by crazyj View Post
Here is my friend's (Karl S.) Fun Jet Ultra that was clocked at 163 mph, and we know it can do better than that, since this was only the first flight!

http://www.youtube.com/watch?v=F2iqVsFA2Sw&hd=1


great speed, sounds like high kv and small propp ? what setup/propp ?
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Old Dec 22, 2011, 09:37 PM
215.0 MPH
markusvt's Avatar
United States, VT, Essex
Joined Jul 2007
1,193 Posts
Cooked my motor at 178mph, these planes can go very fast.

Quote:
Originally Posted by crazyj View Post
Here is my friend's (Karl S.) Fun Jet Ultra that was clocked at 163 mph, and we know it can do better than that, since this was only the first flight!

http://www.youtube.com/watch?v=F2iqVsFA2Sw&hd=1


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Old Dec 23, 2011, 05:28 AM
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Jurgen Heilig's Avatar
53859 Niederkassel, Germany
Joined Sep 2000
18,765 Posts
How do you interprete emoticons?

This subject came up during a conversation with Kevin Hines and it may indeed be something I have never given much thought about - people interpreting emoticons wrong.

Please vote here: http://www.rcgroups.com/forums/showthread.php?t=1560886

Jürgen
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Old Dec 23, 2011, 11:12 AM
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jeffsch's Avatar
Seattle, USA
Joined Oct 2009
891 Posts
FYI, this excellent airframe on sale at Hobby People today (only?) for $80.

http://www.hobbypeople.net/index.php...ultra-kit.html
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Old Dec 23, 2011, 11:24 AM
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United States, AK, Anchorage
Joined Feb 2009
1,287 Posts
If I didn't just buy 4 models I would pick up another FJ.
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Old Dec 23, 2011, 01:24 PM
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United States, PA, Greensburg
Joined Dec 2010
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This is a sign from baby Jesus....I will be placing and order. Thanks for the link!
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Old Dec 23, 2011, 01:31 PM
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xxxcellarator's Avatar
Toronto, Canada
Joined Nov 2009
656 Posts
Quote:
Originally Posted by kbuzz1 View Post
This is a sign from baby Jesus....
LOL, it's more like hobby shops applying marketing strategies which clearly work
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