LiIon cells, and MHz questions...

[Troll]

Hi!

I'm really blank when it comes to electrics... But I'd really want a GWS Tiger Moth, or maybe WES Moth.

And I'm reading what you all are writing on the subjects, and I'm learning. But I need to have some input on a few matters...

LiIon cells seems like the way to go for long lasting flights. What about these (http://www.rcscale.co.uk/RadioEquipment&Batterieshtm.htm) LiIon cells?

Would the 700 mAh work well with the GWS TM engine and ECS?

What do you think about the WES 2.4g servos also found on the page..?
Or what about the WES Tiger Moth found here? (http://www.rcscale.co.uk/Kits.htm)

Anyone have any experience with these (http://www.maxxprod.com/mpi-29.htm#MX-6800) Rx? I says they are FM only. I know what FM is, but what does it mean to me? I want to be able to use the Rx with the Hitec Focus on the 27mHz or the 35mHz bands (72mHz band is not allowed here in Norway)..?

Greatful for inputs!

Jorgen Toll
Norway

[Dr Kiwi]

[QUOTE]Originally posted by Troll
[B]LiIon cells seems like the way to go for long lasting flights. What about these (http://www.rcscale.co.uk/RadioEquipment&Batterieshtm.htm) LiIon cells?

I don't know much about Li Ion but this might help. I can't give you the full text because it exceeds the maximum message length, but there is a link which might be useful. Send this guy an e-mail - he seems to be up on the technology and should be able to answer your questions. Cheers, Dr Kiwi

Lithium Ion Technology in the Radio Control Application.
By Simon Van Leeuwen, Calgary, Alberta - RADIUS SYSTEMS
e-mail lomcovak@telusplanet.net
April 2002 ................

I think Li-Ion would market well on the "regular" model aircraft front, the major obstacle being "if it ain't broke, why fix it mindset" as it relates to Nickel Cadmium technology. I mean really, current technologies still have a long way to go to beat the all-round performance of today's NiCD offerings. In my electrics, modern NiCD's are supplying in excess of 100 amps and can climb vertically out of site in a few seconds. NiMH as a changing technology is coming close, but it's internal resistance is going to keep it in second place until it matches NiCD. At that point, NiCD's will probably become obsolete.

Simon Van Leeuwen, Calgary, Alberta
RADIUS SYSTEMS
Cogito-Ergo-Zoom
IAC25233*MAAC12835*IMAC1756*LSF5953*IMAA20209
lomcovak@telusplanet.net




http://battery.rnd.lgchem.co.kr/english/doc/main.asp


As far as your receiver questions - you probably need to communicate with someone in the UK where the 35MHz frequency is used. 27MHz is used in the US for entry level aircraft but Ihave no experience with it.

[Dave Robelen]

Hi Jorgen,
If you are reffering to the 700 mah Li-Ion cells from SHR, they will not handle the current of the Tiger Moth motor. There are an increasing number of fliers using Li-Ion cells under the name of "Qualcom", but I don't have any references. I too am very fond of the present level ni-cds. The flight durations are quite adequate, the recharge time can be very speedy, and they are very "sturdy" electrically. I have heard from industry sources that there is still another battery type coming along, a Li-Polymer cell, which will have both more current capacity as well as safer operation than the Li-Ion types.
Regards, Dave

[2NG]

Wanna fly the TigerMoth with a power punch, eh! Well, my friend. I have flown the TigerMoth powered by the Beast (Li-Ion). The performance is way out of this world (Hah!!! not really, it will just hurt your neck).

q830's LiIon - Duration
270 - windy days (5-7mph)
300- performanceTigerMoth Li-ion (http://www.radiocontrolzone.com/forums/showthread.php?s=&threadid=79133)

Check it out the guys in ezone magazine. You'll see what I mean..

[Troll]

Thanks for the replies guys!

What about the Powerflite (http://www.bktsi.com/powerflite/powerflite.htm) LiIon batteries?

How do I know how much Amp. or Volt the battery should have?

Have you tried the Pixel with LiIon batteries, Dave?

Jorgen

[Dave Robelen]

Hi Jorgen,
So far, I have not found a Li-Ion battery that is light enough that can handle the current necessary. The motors I have been using, several different versions of the Mabuchi M20 all draw 800 ma or more for a peppy climb with the pixel. Part of the issue is that small biplanes are notoriously inneficient. There is a club group in Canada flying extremely light models with wing areas from 150-300 sq. in. that weigh no more than 60 grams. These do very well on a single 450 mah Li-Ion cell diving a KP-00 motor geared about 16-1 and driving a large prop.
Cheers, Dave

[Taylorcraft]

First of all, welcome to a great forum!

The battery questions are well answered here so I won't talk about that.

When it comes to radio frequencies, you can calmly settle on the 35 MHz band. This is ment for R/C "air traffic" in norway (at least as far as I remember...). The 27 MHz band is better suited for cars and boats, since there's still some "pirvate" radios (CB) out there :) - creating interference.

Any questions, suggestions, need to let out steam or what ever; as long as it's R/C related, here's the place to put it! :)

BRG

Taylorcraft
_______________________________________
Given enough power even a brick will fly.
But, the lighter the brick, the better it flies!

[Troll]

Hey! A fellow countryman!
I'm Swedish, but live in Norway...

[Edit: I didn't see your first line... You're Norwegian?]

Problem is I would like the RFFS-100 actuators and they only work with 72MHz..!

But for the Tiger Moth I can use a 35MHz system.

Jorgen

[Dave Robelen]

Hi Jorgen,
There is another possibility. FMA Direct purchased the rights to another magnetic system built by Rick Rujinsk in the Netherlands. If you contact Fred Marks (owner FMA) he might be able to help. The website is www.fmadirect.com and I believe there is a method for sending Fred a personal E-mail.
Good luck, Dave

[Taylorcraft]

Troll,

This is getting out of topic, so I'll keep it short. :)

Okay cool! You're a Swede living in Norway, I'm Norwegian and living in Sweden.

Back to topic; I hope you'll get the stuff set up and working the way you want it to work.

BRG

Taylorcraft