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Old Jan 01, 2013, 03:52 AM
Scout CX | mCX2 | mSR | 120SR
North_of_49's Avatar
Canada, AB, Edmonton
Joined Dec 2011
6,600 Posts
Quote:
Originally Posted by Dlta Nvmbr Ynkee View Post
Same here I have four batteries and would usually cycle through them without a break I recently got a umx beast 3D do brushless motors have the same problems ?
PS bought a um P-51 motor for the champ
The same thing that destroys brushed motors can also ruin a brushless one... heat. In the RC car/truck community we watch our "temps" very closely... with a temperature gun or telemetry. I have both

you usually only need to find the temps you're hitting with a new setup (gearing... props, gears, pinions, weight changes, etc) to find a ballpark figure for the limit of continuous run times... or when outdoor temperatures change with the seasons. I can run stuff alot harder and longer right now in the winter.
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Old Jan 01, 2013, 08:11 AM
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thinking out loud.

Motor cost 5-10 give or take. you gotten 50-100 runs. the cost is .05-.10 cents per run per length 10 minutes?
comes out to a penny a minute. I say that is not bad at all.

There is a short rest, but way to short.

excellent advice about the motors .

Happy new year all
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Old Jan 01, 2013, 08:48 PM
Scout CX | mCX2 | mSR | 120SR
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Canada, AB, Edmonton
Joined Dec 2011
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Yes, Happy New Year!
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Old Jan 07, 2013, 11:42 AM
JT2
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Joined Jan 2013
21 Posts
Anyone have Champ WeboCalc values?

Could somebody post a screenshot of a WebOCalc for the Hobbyzone Champ?

I've been playing with WebOCalc for this and can't get it to accept any prop size to allow the plane to fly.

From the Hobbyzone Champ page:
Wingspan: 20.3 in (517mm)
Overall Length: 14.3 in (365mm)
Flying Weight: 1.3 oz (38g)
Radio: 4-channel 2.4GHz transmitter with Spektrum DSM 2; 3 channel receiver and aircraft
Prop Size: 130 x 70mm
Charger: DC 3.7V LiPo charger (included)
Recommended Battery: 3.7V 1S 150mAh LiPo (included)
Landing Gear: Fixed main with steerable tail wheel
Trim Scheme Colors: Yellow with orange trim
CG (center of gravity): Approximately 28mm from leading edge of the main wing

I saw elsewhere that someone had the total wing area at 63.3sq
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Old Jan 08, 2013, 06:35 AM
Rockin' & Flyin'
Saxguy1000's Avatar
Virginia Beach
Joined Dec 2009
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This is what I got with my own measurements, but I realize "garbage in, garbage out." Someone feel free to improve on stuff I guessed at like motor kv.

Name: HobbyZone Champ on Webocalc (metric).png
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Description: Name: HobbyZone Champ on Webocalc (Imperial).png
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Quote:
Originally Posted by JT2 View Post
Could somebody post a screenshot of a WebOCalc for the Hobbyzone Champ?

I've been playing with WebOCalc for this and can't get it to accept any prop size to allow the plane to fly.

From the Hobbyzone Champ page:
Wingspan: 20.3 in (517mm)
Overall Length: 14.3 in (365mm)
Flying Weight: 1.3 oz (38g)
Radio: 4-channel 2.4GHz transmitter with Spektrum DSM 2; 3 channel receiver and aircraft
Prop Size: 130 x 70mm
Charger: DC 3.7V LiPo charger (included)
Recommended Battery: 3.7V 1S 150mAh LiPo (included)
Landing Gear: Fixed main with steerable tail wheel
Trim Scheme Colors: Yellow with orange trim
CG (center of gravity): Approximately 28mm from leading edge of the main wing

I saw elsewhere that someone had the total wing area at 63.3sq
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Old Jan 08, 2013, 09:42 AM
NotAnotherMomentLostToSei zures
Chap1012's Avatar
United States, MA, Malden
Joined Mar 2008
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Sax, the 1.5.2 Version is what you have. I notice there are other versions. Any difference between them that you know of?

BTW, nice find

Mike.
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Old Jan 08, 2013, 02:11 PM
JT2
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Joined Jan 2013
21 Posts
Champ WebOCalc

Yes, that is about what I had too...

I was trying to come up with the stock motor kvm. I don't have a feel for the thrust on this plane as I don't have enough flight time on it yet.

Here what I came up with, with the goal of getting the 4:1 gear ratio of the 5x3 stock prop
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Old Jan 08, 2013, 07:29 PM
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United States, NM, Deming
Joined Sep 2012
418 Posts
Champ gearbox shaft.

Can someone please advise me on how to remove the gearbox shaft for the champ? I need to replace it and the nylon gear. Thanks in advance.
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Old Jan 09, 2013, 04:12 AM
Rockin' & Flyin'
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Virginia Beach
Joined Dec 2009
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Quote:
Originally Posted by cervri View Post
Can someone please advise me on how to remove the gearbox shaft for the champ? I need to replace it and the nylon gear. Thanks in advance.
Hi. You have to carefully cut the tape that holds the fuselage together, open it and work on it from there. Hold the nut on the back side of the shaft with needle nose pliers and turn the prop to loosen and remove it. Replace and re-tape the fuse back together. Off into the wild blue after that.
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Old Jan 09, 2013, 04:13 AM
Rockin' & Flyin'
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Virginia Beach
Joined Dec 2009
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Quote:
Originally Posted by Chap1012 View Post
Sax, the 1.5.2 Version is what you have. I notice there are other versions. Any difference between them that you know of?

BTW, nice find

Mike.
Wasn't aware of the different versions, Mike. Thanks for telling me that. I was using an old bookmark.

Update: Just figured the same data as what JT2 has above and it comes out exactly the same with version 1.7.6. The new version has fewer bugs and more options, but same results.
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Last edited by Saxguy1000; Jan 09, 2013 at 05:02 AM. Reason: Last line added
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Old Jan 09, 2013, 04:14 AM
Rockin' & Flyin'
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Virginia Beach
Joined Dec 2009
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Quote:
Originally Posted by JT2 View Post
Yes, that is about what I had too...

I was trying to come up with the stock motor kvm. I don't have a feel for the thrust on this plane as I don't have enough flight time on it yet.

Here what I came up with, with the goal of getting the 4:1 gear ratio of the 5x3 stock prop
That's got to be pretty close to right.
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Old Jan 09, 2013, 09:35 AM
NotAnotherMomentLostToSei zures
Chap1012's Avatar
United States, MA, Malden
Joined Mar 2008
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Quote:
Originally Posted by Saxguy1000 View Post
Wasn't aware of the different versions, Mike. Thanks for telling me that. I was using an old bookmark.

Update: Just figured the same data as what JT2 has above and it comes out exactly the same with version 1.7.6. The new version has fewer bugs and more options, but same results.
Got it! Thanks

Mike.
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Old Jan 09, 2013, 08:18 PM
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What's the best battery for the Champ? Where are you guys picking them up? My 150s are getting tired. I think I read somewhere about 190s.
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Old Jan 09, 2013, 09:05 PM
NotAnotherMomentLostToSei zures
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United States, MA, Malden
Joined Mar 2008
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Quote:
Originally Posted by Iplumb View Post
What's the best battery for the Champ? Where are you guys picking them up? My 150s are getting tired. I think I read somewhere about 190s.
I believe these are the batts you are talking about. They come from the UK. I think I seen some on ebay. I hear a lot of good talk about these. Miniaviation.
http://www.miniaviation.com/KM_190P.html

I would check them out but, I have a fleet of 6 Thunder Power 160mah 25C batts that are still flying very well.

Mike.
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Old Jan 10, 2013, 04:27 AM
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Virginia Beach
Joined Dec 2009
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Quote:
Originally Posted by North_of_49 View Post
These are the same ones in 1-3/4" and 2" ... modified...

http://www.rcgroups.com/forums/showp...postcount=3682


The 2"

Attachment 5362733
Attachment 5362736
Hey, North, I was just noticing the wheel supports in the photos. How did you do that mod? Very nice.
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