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Old Sep 09, 2004, 08:43 PM
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Let me see if I can find a picture to post later. The plane was a Bimbonic Electronic Airplane of my own design about 4 1/2 lbs and 450 squares. I ran 11 1700 FAUP A cell Sanyos. This is probably more amps than you should run if you want a lot of charge cycles, but they are pretty lightweight.

There are a pile of planes that Northeast Sailplanes sells that would work well with this motor. The great thing about them is their weight and ability to swing a big prop with no gearbox.
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Old Oct 27, 2004, 03:48 PM
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This was a great article. I am new to this hobby and I can see where ARF conversion is possible and can still be affordable. It looks like I came into the hobby at the right time. The Price/Performance point seems to be getting lower every 6 months.

I like the dual pack idea. I just ordered 2 8 x 2100 packs to run in my Zagi. Based on your findings I may be able to use these in a double pack setup.

Also thanks for the listing of planes. It's also what I have been looking for.

What I would love to see is a .25 conversion using a cheaper Speed 400 or 480 as opposed to brushless.

Walt
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Old Oct 27, 2004, 05:41 PM
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You need a bigger motor for a .25 plane. The 400 or 480 is a 1/2 A equivelant.

We used to fly H Rays with a 25 at 3 1/2 lbs and 400 or so square inches. this would be a speed 600 size plane, preferably geared. Cost about 20 and figure another 30 for a cheap decent gearbox. And only one 8 cell pack. Two would be too heavy
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Old Oct 27, 2004, 11:37 PM
jrb
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.20 sized planes have been flown via Magnetic Mayhem on 8 cells direct drive and up to 10 with a gearbox.

Examples are the Happy Fly 20 and Frontier 20 from World Models; article in QF (SEM). Here too??

10 cells and a geared Endo can get you a larger plane .30 for sure; Carlos seems to like it in two Machs from WM:

http://www.rcgroups.com/forums/showthread.php?t=215044

http://www.rcgroups.com/forums/showthread.php?t=225134

The Hobbico SuperStar EP is also worth considering; understand there’s a new wing w/ailerons now: http://www.rcgroups.com/forums/showthread.php?t=112961 .

But none of the above are Two Six Packs.
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Old Nov 16, 2004, 01:19 PM
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24 cell 3S8P 9200ma Li-Ion DuraPlane

I have used a Duraplane with Jet 30/3 12/6 prop to test new 50 cent surplus cellular phone Li-Ion prismatic Qualcomm TXBAT033 batteries.
The $12 1 HP 24 cell 3S8P pack weighs 2 1/2 LBs

The trainer does Touch 'N GOs for over half hour and takes off in 10 feet at 45 degree , a neat short take-off and land plane, weighs about 7 LBs
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Old Nov 28, 2004, 07:55 AM
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Jim,

Thanks for your excellent explanation.

Would you share with us more of your non “plug and play” geared recipe that you’ve been using for flying forty trainers?. (As you mention: more elegant & efficient).

Thanks
Charles
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Old Nov 28, 2004, 02:01 PM
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Below are links for more info; the two geared solutions that were listed in the article, my gallery, and the successful systems posting where other geared set-ups can be found.

The “brushed” system is kind of plug and play in that once again all of the parts/components can be obtained from a LHS. Its economical and fairly capable, again using 12cells (two six packs).

With respect to “more elegant & efficient” my meaning rely refers to matching a prop to the plane’s mission and getting the most from a motor and pack. In general larger props and running an electric motor at higher rpm is more efficient, to get there take a more elegant solution; the heart of which is a variable ration gearbox.

By being able to vary the ratio of the gearbox you can better match the motor to the prop needed for the load/mission. Just like a transmission in a car.

Two gearboxes that do this are the Great Planes GD-600 ( http://www2.towerhobbies.com/cgi-bin...&I=LXSL79&P=ML ), and my personal favorite the MEC SuperBox ( http://www.modelelectronicscorp.com/ ).

The GD-600 useable pinion range is 10T to 20 (something) with 1/8” shaft motors like 05/S500/S600/550. A great 10cell combo was developed by Gary Wright and uses the Kyosho Endoplasma.

For more than 500watts and a lot more ratios and pinion shaft diameters (1/8, 3/16, & 5mm) go with the MEC.

Fixed gear ratios (i.e. planetary boxes) limit prop selection in much same way as a direct drive solution.


Brushed: http://www.rcgroups.com/forums/showp...92&postcount=4

Brushless: http://www.rcgroups.com/forums/showp...39&postcount=1

Gallery: http://rcgroups.com/gallery/showgall...500&ppuser=497

Successful systems: http://www.rcgroups.com/forums/showthread.php?t=203529
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Old Feb 24, 2005, 11:01 AM
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That last grade hurt; think it was a zero .
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Old May 13, 2005, 04:59 PM
jrb
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3700s & SPT

My Two Six Packs of Zapped and Pasted GP3700s in MEC SPTs arrived yesterday and are looking great! (Model Electronics Corp, Solderless Power Tubes: www.modelelectronicscorp.com )

C/10 equalizing charge over night, resting during the day, and then a 5amp Peak and they're better than 3300s configured the same way; will get even better with a few cycles under their belt – cycling them now.

A bit larger (diameter) than the GP3300s, the GP3700s squeeze into the SPTs; looks like Pete trims a bit of the bottom shrink to be sure of getting good contact.

Used my Omega ( http://www.rcgroups.com/forums/showp...48&postcount=3 ) for the static tests listed below; data is HOC (hot off charger):

SPTnGP3700sZ&P: 33amps, 7.2volts, & 234watts
SPTnGP3300sZ&P: 32amps, 7.2volts, & 225watts
SMC GP3300: 30.8amps, 7volts, & 208watts
SPTnP3000sZ: 26.6amps, 6.3volts, & 169watts
DuraTrax RC2000s: 26.6amps, 6.3volts, & 169watts

More capacity and power; looking forward to using them in Rick’s Eagle 2, and in my American Flyer & Omega.

Pete’s also got an A size SPT for GP1100s & 2000s; another very good cell.

Beyond the Tootsie Pops I found a new MEC Logo in the box; it’ll look good on a model.
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Last edited by jrb; May 15, 2005 at 05:04 PM.
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Old May 15, 2005, 05:02 PM
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Fixed the links.
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Old May 17, 2005, 02:51 PM
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Here’s a scan of the new log; decal is clear it’s the backing that is yellow.
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Old Feb 18, 2006, 10:40 AM
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Could you post a diagram of a series harness for two 6-cell packs?
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Old Feb 19, 2006, 07:44 AM
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The Sermos/Anderson Power Pole connectors allow you to do it w/o a harness; a Dean’s harness is pretty straight forward: connect the red and black from the two pack together in series, and the other red blacks like a pack.
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Old Feb 21, 2006, 09:29 PM
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Nice looking series pack. Thanks.
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Old Feb 26, 2006, 12:37 PM
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Here’s a shot of a series harness; though it goes from packs with Deans to ECS/Charger with Sermos/Anderson PP.
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