| Title: | Welcome To The Radio Control Conference |
| Notice: | dir's in 11, who's who in 4, sales in 6, auctions 19 |
| Moderator: | VMSSG::FRIEDRICHS |
| Created: | Tue Jan 13 1987 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1706 |
| Total number of notes: | 27193 |
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1532.1 | My first five cell pack | ANGLIN::BEATTY | Mon Jun 07 1993 18:32 | 32 | |
I ran a 5 cell 6 volt pack (600MAh) on a five channel Chipmunk for the
first time this weekend. I did this because its fairly fast and puts
high loads on the servos and it has retracts that I am having a hard
time getting adjusted without a slight occasional buzz from the servo.
Before doing this I called Futaba. They said a 6 volt pack is not
a problem and would not harm the receiver or the servos.
The servos definitely do move faster. The other nice thing about them
was after about one hour in the air I tested the battery on an ESV at a
500 OHM draw and still had right at 6 volts left on the battery. That
is good insurance. You may or may not get insurance against a shorted
cell. The difference would be in how it shorted. An internally
shorted cell might not take the voltage to a critically low level like
it could quickly do in a 4 cell pack. An external short would draw the
pack down in a hurry.
The only reason I can think of the glider drivers plane rolling faster
is that the servos have the punch to hold the ailerons at full
deflection where the 4 cell pack might not have handled it.
I made my pack out of 600 MAh Sanyo AA size with tabs. You can get
solder wick at radio shack to reinforce the tab connection. Only cost
about $13.00 for a first class pack.
I bought two 1300 MAh five cell packs from SR to run in a quarter scale
plane using an ACE 2X5 redundant system. They too run the servos very
quickly.
Hope my soldering holds up in the Chipmunk!
Will
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| 1532.2 | 5 cell rx-pack - a must in redundant configs | FRUST::HERMANN | Siempre Ch�vere | Tue Jun 08 1993 02:53 | 12 |
5 cell packs are a must if you use them in a redundant configuration, i.e. two packs with a series diode each. a standard diode eats up half of the 1.2v gain you get from the extra cell. considering that a freshly charged 4 cell pack can have 6v also, there should be no problem using a 5 cell pack. but a freshly charged 5 cell pack can have >7v in the beginning... so it's a good idea to check with your manufacturer about the allowed voltage range of your rx and servos. cheers joe t. | |||||
| 1532.3 | Definately ask the manufacturer | KBOMFG::KLINGENBERG | Tue Jun 08 1993 09:26 | 14 | |
I sytrongly second that - check with your equipment manufacturer.
Multiplex for example - until last year - strongly advised against
using more than 4 cells for a normal receiver battery pack (they
offered a 5 cell redundant battery system as Joe describes, though).
Last year, they came out with a new line of microprocessor controlled
servos (all exactly the same speed, processor makes up for temperature
effects etc.). They also brought a new line of receivers, and all can
run on 4-6 cells. If you use only 4 cells, it's all compatible with
their conventional line of equipment.
Best regards,
Hartmut
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