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jrb
09-02-2005, 07:28 PM
The following is updated from this post ( http://www.rcgroups.com/forums/showpost.php?p=1352292&postcount=4 ) and also referenced in this article ( http://www.rcgroups.com/links/index.php?id=4485 ):

Here’s a “What works list” for an economical way to fly a 40ish plane using 2 RC Car “Six Packs” (about 33 amps, 6 minutes-plus duration w/2000s):


Motor:
Trinity Maxx Mild (not the Wild!):
http://www2.towerhobbies.com/cgi-bi...p?&I=LXWR55&P=7

When brushes are needed do this -- Brush upgrade to 5x5:
http://www2.towerhobbies.com/cgi-bi...p?&I=LXBPF6&P=0

Spare armature:
http://www2.towerhobbies.com/cgi-bi...p?&I=LXWR58&P=7


Gearbox – must be 3.5 to 1:
Master Airscrew Gearbox (what I use):
http://www2.towerhobbies.com/cgi-bi...p?&I=LXZ900&P=7

Or,

Great Planes Gearbox:
http://www2.towerhobbies.com/cgi-bi...p?&I=LXSL79&P=7

Pinion required – 13T 48 pitch
http://www2.towerhobbies.com/cgi-bi...p?&I=LXEX11&P=7


Speed Control:
Jeti JES045 ESC – 12 & BEC:
http://www.hobby-lobby.com/jeti.htm


Propeller:
APC “E” 13x10:
http://www2.towerhobbies.com/cgi-bi...p?&I=LXZL01&P=7


Batteries:

Always best to buy what you can see:
http://www2.towerhobbies.com/cgi-bi...p?&I=LXST62&P=7
The Six Packs:

Always best to buy what you can see:

Two Six Packs of GP3300s come boxed together from SMC ( http://www2.towerhobbies.com/cgi-bi...p?&I=LXDPD2&P=0 ), they’re excellent with 8 to 10 minutes of duration!

Also, DuraTrax does a 6 pack of Sanyo RC2400s ( http://www2.towerhobbies.com/cgi-bi...p?&I=LXST62&P=0 ).


Something cheap like this might work; I flew an E-Maxx boxed set of 2000 packs that were supposed to be Sanyo, they flew like Duratrax Sanyos:
http://www2.towerhobbies.com/cgi-bi...p?&I=LXCLS6&P=7


I’ve flown the red, white and blue plane in this photo with the above; more info can be found in my gallery, here (others are electric too!): http://www.rcgroups.com/gallery/showgallery.php?ppuser=497&cat=500

jrb
09-02-2005, 07:55 PM
I would like to add consider getting your battery pack from MEC of Zapped & Pasted cells in a Solderless Power Tube(s) -- http://www.modelelectronicscorp.com/ !

The latest I’ve gotten from Pete are GP3700s; the best Sub C cell to date. Volts and duration are great!

Picked up better than an Amp over GP3300s; which were better than the P3000s by an equal amount. And, the P3000s did better than were better than Sanyo R2000 NiCds.

Pasting blows away welded cell performance by a couple of amps. Zapping adds too!

Yes, that almost 8amps for Z&P 3700s compared to welded NiCds.


The A size 2000s compare favorably with LiPos in price, weight and duration. SPTS are also available for these.


PS: If you get an MEC SuperBox you’ll be able to use it with the added power of a brushless when upgrading in the future.

pdk
09-08-2005, 05:02 AM
Hi Jim,

I have just helped a friend with a conversion. I built an LRK which I wound to run on 12 cells turning a 13 x 8 at 30 amps. On a 12 cell pack I have here (3000mah soldered) it ran as expected. When I sent the motor to Him (I am in Australia and he is in the US) the motor was only drawing 22Amps. As you can see by the pic the voltage has been pulled down below 1V per cell as well. His packs were supposed to be good buggy packs but it didn't look like it. He sent them over and I pulled them apart to find the welded tags were very thin and flimsy. Definitly the point for the losses.

As you say get the good cells (soldered or those MEC packs etc) and it will be a real performer. (He splashed out and replaced the packs with lipo's which were 1000mah larger and 9 oz lighter but I would like to have seen how good buggy packs would go)

Great list of information Jim, I am sure that many will give it a go. I am patiently waiting to hear how my friend's trainer goes on the maiden.

Best regards
Phil