hi i have chosen the following for an electric set up in a pt 40... which battery do you suggest?

http://www.hobbycity.com/hobbycity/s...idProduct=2098

http://www.hobbycity.com/hobbycity/s...idProduct=5522

http://www3.towerhobbies.com/cgi-bin...?&I=LXRDH3&P=7



is this an appropriate battery??

http://www3.towerhobbies.com/cgi-bin...&I=LXNCR1&P=ML

thanks in advance!

you must get a LIPO else it will be useless... 3Cell at least but 4Cell recommended... it can handle actually up to 6Cell...

http://www.hobbycity.com/hobbycity/s...idProduct=9185 ?


http://www.hobbycity.com/hobbycity/s...idProduct=9340 ?

With a 600KV motor and a 12" prop you definitely want to go 14.8v at least.

Since that is a .46 sized plane, you'll be shooting to get over 800 watts of power into the motor and the batteries MUST be able to keep up.

So 800 / 14.8 = 54A ( about right for your ESC! ) is what your batteries must be capable of...

The minimum packs you'll need are 14.8v 20C 3000mAh packs, but you'll do better with higher capacity packs such as the 4000's or even the 5000's for longer run times at minimal additional weight.

I would use these: [link=http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=9177&Product_Name=Turnig y_5000mAh_4S_20C_Lipo_Pack]Click me![/link]

But you'll need to make up your own adaptor as the battery has non-standard leads. From the same web site I obtained the required connectors and deans plugs to make up adaptors.

I would actually use a 5S or 6S battery to get over 10K with a sizeable prop. I would also ditch the HV ESC from Tower and get yourself a Turnigy PLush 60 or 80 amp from Hobbycity. They are pretty reliable and will save you money. I wouldn't go with anything smaller than a 3300 mah 5S lipo. I wish I had more time to send you a link.
Regards,
Curtis
P.S. If you haven't ordered yet, I can show you my setup for my Giles 202 which I have tested to make about 6 pounds at about 45 mph. Will repost later.

Here is my setup for a plane that will weigh about 5.5 pounds AUW.

The Battery is equivalent to this: [link=http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=9178&Product_Name=Turnig y_4000mAh_6S_20C_Lipo_Pack]Turnigy 22.2V 20C 4000 mah[/link]
The Motor is this: [link=http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=7871&Product_Name=TGY_Ae rodriveXp_SK_Series_42-60_500Kv_/_1475W]Turnigy SK 42-60-500[/link]
The ESC with BEC is [link=http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=2166&Product_Name=TURNIG Y_Plush_60amp_Speed_Controller]Turnigy Plush 60A with 3A BEC[/link]
All for $130
This will make a safe 1100 Watts. I was testing it with a 12x6 APC Sport prop and it was turning 10500 RPM at 36 Amps. (about 700W) and it was cool to the touch after about 30 seconds on the stand.
Have fun and let us know what you choose.
Curtis

which adapters did you happen to choose?

I have been getting mixed opinions about the 6s so that is still up in the air... I am ordering them later on today... once I have confirmed everything I need...as of right now this is my set up..

Brushless Motor

http://www.hobbycity.com/hobbycity/s...idProduct=2098

ESC

http://www.hobbycity.com/hobbycity/s...idProduct=2166

Prop

http://www.hobbycity.com/hobbycity/s...idProduct=5441

Battery
http://www.hobbycity.com/hobbycity/s..._20C_Lipo_Pack OR http://www.hobbycity.com/hobbycity/s..._20C_Lipo_Pack

(*now just to figure out which adapters)

What is the drawback to the 6S? Is it the charger? One reason I went with it was that I could push fewer amps into it for the same amount of power. With your setup and the motor kv, you would only expect about 8880 RPM unloaded. Now if you are loading it up to 70-80% of that by putting on a prop, it will drop down to 5300 - 7100 RPM, which might be low for whatever prop you want to run. The lower you go, the wider the prop has to be to get the same amount of thrust. My aim was to get the prop up to about 10k when it was fully loaded.
This isn't a subject that is discussed very much on the RCU beginner forum, I have gotten a lot of help over on RCGroups in the Glow to Electric Conversion forum.
Best Regards,
Curtis

As Beau0090_99 stated there is no real drawback to 6S, and there is one BIG advantage to it...

Namely you can get to 6S using 3S packs!

If you wire up two 3S packs in series, it will become one 6S pack of the same capacity.

This gives you the flexibility of purchasing smaller packs that you can use on other electrics.

I avoid all-in-one 6S packs altogether because of this... 4S is as large as I typically go in a single pack, for more voltage I wire them up in series instead.... for flexibility... and compatibility with most of my Intelligent chargers/cyclers/balancers.

But that's just my preference.



However, you can run the prop at 8800 RPM without problems, you just need a bit more pitch to sustain the same speeds.

I agree with the 2 pack idea. The 8880 speed is with the motor unloaded with his 4S configuration, he wouldn't make any power at that speed though.
Curtis

this is confusing hehe :P... oh well..

Yeah not on that size of a plane. I normally reserve the 4S packs for .25 - .32 sized planes at most... then use multiple packs for larger planes.

I'm a fan of series wiring 3S packs or 4S packs for larger planes.

It's not that confusing... once you've done it.

Let's say you have TWO identical 3200mAh 3S LiPo batteries. Each only produces 11.1v nominally.

If you use one of these: [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXNKY9&P=ML]Click me for Series Adaptor[/link]

The TWO batteries will behave like one 3200mAh 6S LiPo producing 22.2v.

The higher voltage will turn the motor over faster ( if it can handle it! ) and produce higher power output... only if your ESC and motor can handle the voltage.

-

You can also wire two batteries in parallel.

Let's say you have TWO 2200mAh 20C 11.1v LiPo packs.

These are each capable of at maximum producing 44 amps of current, but you'll be pushing the batteries pretty hard if you attempt to draw this much current from them.

Let's say that one pack gives you 8-10 minutes of flight time.

Well you can use one of these: [link=http://Click me for Parallel Adaptor]http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXNKY8&P=7[/link]

To combine the packs to work as one big 4400mAh 20C 11.1v LiPo pack.

Now the combined pack will sustain up to 88Amps ( if you push it of course ) or it will loaf along at 44 Amps!

In addition your 8-10 minutes of flight time gets doubled to 16-20 minutes of non-stop flying.

( I did this with my SuperSportster EP and I get 30 minutes of flight time out of it non-stop! ).

-

You can also combine Parallel and Series adaptors for even bigger installations.

So with one of each of those adaptors and FOUR 2200mAh LiPo packs you get the effective output of having one massive 4400mAh 22.2v 6S battery pack capable of 80A.

There's a big advantage to using multiple packs in parralel or series config and that is if one set of cells dies, then you can get rid of that pack and buy a new one for half or less of the cost. The 2200 mah 3S packs now are getting down right cheap. Hobbycity is doing a good job of getting bigger packs and many different configurations. Jose and I agree on one thing though, 4S is too small for your app and the size of plane you want, like he said, it would be more suitable for a .25-.32 size plane.
Good luck and ask questions,
Curtis

Yes, and you get a lot of flexibility for your investment in LiPo's.

The extra connectors only add a minimal amount of weight.

Heh, I thought we agreed on everything above?

http://www.hobbycity.com/hobbycity/s...idProduct=6569

this isn't the same as the adapter you have suggested is it? (or similar)

No, Actually what this thing does is take two 3S lipos and allow you to balance charge them as one 6S battery. Each battery has 4 connections for the balance tap(ground, cell1, cell2 and cell3), so 2 3 cell batteries(11.1 each) would have 8, but one 6S battery only has 7 connections (each cell plus the ground). This connector works well with the Turnigy Accucell-6 charger which can charge up to 6S batteries at 50W.
Curtis
P.S. I think HC has an issue with their site right now and I can't find any of the series and parallel connectors on it for you.

OKay thanks!

Yeah I would prefer buying it all from the same site .. instead of one from tower and the other 4 things or so from hobby city... (because that means I need to make up two separate PO's) :P

If whenever its up and you find one can you send me the link S.V.P...
Thanks!

FYI: I get the best results from HC when things are shipped via EMS.

Also make SURE that EVERYTHING on your order is in stock when you select things.

yeah i am ordering EMS and I had read problems about things that were out of stock so I made sure I selected everything that was in!

thanks!

Here would be an example of a series connector. They must be having problems again because I don't see any stock listings. I hope they can get back up and running shortly. I am not sure what connectors you will get on your battery, but it might be a good idea to get some extra 12AWG and spare plugs for future reference. You can make yourself a series connector rather easily with whatever you use.
Curtis

[link=http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=7879&Product_Name=EC3_Ba ttery_Harness_14AWG_for_2_Packs_in_Series_]EC3 2 pack series connector[/link]