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Other › Receiver Battery on logo 14 : 1600 NiMh or 2300​NiMH ?
10-07-2005 05:22 PM  12 years agoPost 1
JEY

rrNovice

Paris

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I know most of you use UBEC on logo 14, but I want to maximize flight duration, and not doing 3D, I think it is ok using an external battery. However, I hesitate between Sanyo 1600 niMh and 2300 NiMH.
The second is 50 g heavier.
I use 3 x 9650 servos + GY401 and 9253.
I think I can have a 18 minutes flight with my 10s2P 10 tooth, with calm flight. Do you think with a 1600 mah receiver battery I can do 2 flights ? How many with a 2300 maH ?

I had a 1700 NiCd 6V on my raptor (an I just realized GY 401 and 9253 only accept 4.8V, damn ! hopefully they are still ok), and could do 5-6 flights with it, but no numeric servos on cyclic.

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10-07-2005 06:24 PM  12 years agoPost 2
Larry

rrApprentice

SE Florida

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i would use the ubec.... the amount of power that you will drawer off the pack is near nothing...remember the seperate pack is 4.8 volts 1800 but the 10s is 40 volts then nocked down..so 1800 mah at 4.8 volts does not mean you would use 1800 on the 40 volt pack..

save the weight and go the ubec route...

just my thoughts....

Larry

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10-07-2005 06:30 PM  12 years agoPost 3
mudbogger2

rrKey Veteran

Hoschton,Ga.

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I agree with Larry get a bec of some kind.
Read these thread on NiMh batts for rx batteries.
http://www.runryder.com/helicopter/...hlight=401+nimh
http://www.runryder.com/helicopter/...hlight=401+nimh

I would use a 1700 nicad before I used any Nimh for rx pack.

Jon Jennings

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10-08-2005 03:55 AM  12 years agoPost 4
CustomPC

rrVeteran

Sydney, NSW -​Australia

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I myself am still a bit wary about using external BEC's. There was some reports recently about glitching problems when using BEC's and a Jazz ESC on 35Mhz.
Here in Australia we're on 36Mhz so i've not dared to use a BEC yet.

I have a Logo 20 with 3 x 9252's, a GY401 and 9253. I use a 4 cell pack of the GP1100 NiMH's. These cells are capable of 25A+. The pack weighs 120gm and I routinely get four 10 minute flights from this pack before i recharge the pack. I am a mild flyer. Just forward flight and no 3D.

I've just got a Logo 14 and i will be using the same cells again in the 14 to start but i do have a Medusa Research 45V BEC in my kitbox that i might try at some stage.

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10-10-2005 10:20 PM  12 years agoPost 5
hecklopeter

rrNovice

Surrey, England

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Unfortunately I have had problems with BECs on 35MHz having tried the Medusa 45V unit and the Logo 12v type in an ECO8 and Logo10. The BECs produced glitching using PPM receivers which was masked by changing to PCM receivers. The real problem I found was an unacceptable decrease in radio range (JR radio). This was partly improved by changing to dual conversion receivers. The change back to separate battery resolved all the radio range issues. Be warned, carryout a comprhensive radio range check before settling for a BEC particularly when using 35MHz equipment.

I recently changed to digital servos and the power requirement is considerable compared to the original servos. I switched to an old Nicad 800AR pack (fast charge type) as the NMiH 1800 cells AA size (Overlander) could not handle the current as seen on the battery monitor. I have one of those monitors that shows the present voltage on the battery as well as the lowest voltage (at max current surge). I found the NMih cells keep falling into the 'red' band at max current after less that 6 min flight . I will be buying a set of Nicad CP1300 (Flight cells) (140 gms) to save having to change receiver batteries mid fliying session.

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10-11-2005 10:19 AM  12 years agoPost 6
JEY

rrNovice

Paris

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In France we use 41MHz band, so perhaps glitching is not present when using UBEC ? (glitching only near 35MHz ?)

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10-11-2005 11:21 AM  12 years agoPost 7
Dr Lodge

rrElite Veteran

Guildford, Surrey -​UK

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I've used a UBEC on my Logo 10 with no problems at all, and that's on 35Mhz. It may be down to the design of the UBEC as a switching device such as this is going to put out of degree of "interference" - just how much and what effect it'll have will be down to the design.

Vibe 90, Vibe 50, Vigor CS x2,
Dyna-x, Knight 503D, Logo 10,
TRex 500, Furion, Gaui EP200

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10-11-2005 02:14 PM  12 years agoPost 8
Bert Kammerer

rrVeteran

Orlando, Florida

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I don't think that flight time would be affected by using a BEC. "Ultimate BEC" (UBEC) is one of the best and since your receiver will only be drawing 1 amp or less average, your flight time will not be affected. In other words, I think you would only be able to get a few more seconds worth if you use a receiver battery, but you will then have the aggravation of charging another battery plus extra weight.

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10-12-2005 01:37 AM  12 years agoPost 9
epc2

rrVeteran

Miami ,​Fl./S.Domingo.

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I don't know if it's me but , Today while setting my Logo 10E the Ubec failed on me inmediately just after I connected the batt. I saw some smoke coming out of the UBEC and inmediately disconected from the Rx and also disconected the batt. from the ESC.

Half an hour later I Checked everything with a rx. batt. this time and everything was Ok . I was lucky but no more UBEC's for me.

Tell me If I did something wrong:

I had:

-UBEC output connected to the Batt. port on Rx.
-UBEC Input soldered to the back of the ESC connectors via a deans connector.

I plugged the UBEC to the ESC and then plugged the batt. to the ESC.

??????????

epc2.

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10-12-2005 01:48 AM  12 years agoPost 10
mudbogger2

rrKey Veteran

Hoschton,Ga.

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Sounds like you had the propoer procedures.
Did you have the correct version for you battery? My 2 have been flawless for many flights flights.

Jon Jennings

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10-12-2005 02:14 AM  12 years agoPost 11
epc2

rrVeteran

Miami ,​Fl./S.Domingo.

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Yep, the unit is an HV 45V and I'm using 6s2p.

epc2.

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10-12-2005 02:20 AM  12 years agoPost 12
epc2

rrVeteran

Miami ,​Fl./S.Domingo.

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Something strange is that las night I was setting the servos , checking the gears etc and I was using a 2100 3s Batt. cuz I was just setting servo directions etc. and the UBEC worked Ok. and it failed today when I plugged the 6s. , Maybe it's marked as an HV and it's not , who knows?

????

epc2.

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