Voltage Step Down BLS251

chris982 · 08-16-2012, 12:27 AM

Has anybody use a step down for their BLS251? If so, how did you configure your wiring? Was it neat or did it take up more space than planed?

CyprusFlyer · 08-16-2012, 01:46 AM

Advice is don't bother with a step down, do not use it myself and reports of others using for years at 5.6 -6v and no ill effects. Also rational is that fully charged batteries used of old reached those voltages anyway.

ChrisH · 08-16-2012, 01:53 AM

BLS251 are rated for 6V, use them at 6V.

Chris Sexton · 08-16-2012, 07:56 AM

I am running 3 of these at 5.6-6V no issues at all. As stated, they can handle 6v. The speed specs are for 4.8v but it's cool.

chris982 · 08-16-2012, 08:37 AM

I understand this but the specs say 4.8V. Wouldn't this cause a servo failure in the long run? I brought the step down but won't have any place to put it. So, I'm going without but don't want to crash the chopper. Why is it rated at 4.8V if it can do 6V?

jockstrap · 08-16-2012, 09:15 AM

It's to do with the 4.8V ratings referring to older nicad battery packs which, when fully charged were approx 6V rather than the nominal rated 4.8v ..

A bit like a car batt rated at 12v but is actually 13.8v

chris982 · 08-16-2012, 09:21 AM

Quote:

Originally Posted by jockstrap

It's to do with the 4.8V ratings referring to older nicad battery packs which, when fully charged were approx 6V rather than the nominal rated 4.8v ..

A bit like a car batt rated at 12v but is actually 13.8v

I think I can live with that.

TommyBear · 08-21-2012, 03:11 AM

Regardless of what people say. I would still use the step down diode on the BLS 251. I have been using BLS 251 on my TDR, T700 and Logo 600SE with step down.

geekindenial · 08-21-2012, 03:50 AM

I use the Align two way step down to step down from 6v. Cheap and works.

CyprusFlyer · 08-21-2012, 04:27 AM

Personal choice of course, but another point of failure in the way when the servo will run happily on 5.6 - 6v is not one for me.

Dumbthumb75 · 08-21-2012, 04:43 AM

Quote:

Originally Posted by CyprusFlyer

Personal choice of course, but another point of failure in the way when the servo will run happily on 5.6 - 6v is not one for me.

+1.

chris982 · 08-21-2012, 04:44 AM

I just returned my step down to amainhobbies. I didn't see Jan using it per the manual.

ChrisH · 08-21-2012, 01:46 PM

Quote:

Originally Posted by TommyBear

Regardless of what people say. I would still use the step down diode on the BLS 251. I have been using BLS 251 on my TDR, T700 and Logo 600SE with step down.

It's not "what people say" ... it's what the manufacturer specs

http://www.mhm-modellbau.de/pdf/tech...rvos-robbe.pdf

chris982 · 08-21-2012, 09:38 PM

Quote:

Originally Posted by ChrisH

It's not "what people say" ... it's what the manufacturer specs

http://www.mhm-modellbau.de/pdf/tech...rvos-robbe.pdf

So, I need to reorder the the step down? I just don't see where I can put it on the TDR.

ChrisH · 08-21-2012, 11:29 PM

Quote:

Originally Posted by chris982

So, I need to reorder the the step down? I just don't see where I can put it on the TDR.

NO, the BLS251 is rated to 6V on that spec sheet from Robbe (Futaba Europe).

jhunter · 08-22-2012, 12:32 AM

I'll give you a step down if you want one but I have well over 100's of flights on bls 251's at 5.6 of the jive.

jointer · 08-22-2012, 07:55 AM

I had 700 flights with BLS251 at 6V from Jive - do not worry, it is working just fine.
(i must say, better then the Outrage i have now)

chris982 · 08-22-2012, 03:11 PM

Thanks! I should be getting my kit shipped next month.

08-16-2012, 12:27 AM	#1
chris982 Registered Users Join Date: Nov 2010 Location: Richmond, Virginia	Voltage Step Down BLS251 Has anybody use a step down for their BLS251? If so, how did you configure your wiring? Was it neat or did it take up more space than planed?

08-16-2012, 01:46 AM	#2
CyprusFlyer Registered Users My HF Map location Join Date: Jan 2012 Location: Pissouri, Cyprus	Advice is don't bother with a step down, do not use it myself and reports of others using for years at 5.6 -6v and no ill effects. Also rational is that fully charged batteries used of old reached those voltages anyway. __________________ TREX 550E LOGO 500SE & 600SE & 600SX Synergy E7 zzzzzzzzzzzzzzTDR

08-16-2012, 01:53 AM	#3
ChrisH HF Support Join Date: Aug 2007 Location: CA	BLS251 are rated for 6V, use them at 6V. __________________ Edge Rotorblades Thor/Voltz Batteries 450 Pro V-Bar 130X

08-16-2012, 07:56 AM	#4
Chris Sexton Registered Users My HF Map location Join Date: Feb 2011 Location: Columbus, Ohio	I am running 3 of these at 5.6-6V no issues at all. As stated, they can handle 6v. The speed specs are for 4.8v but it's cool. __________________ Team Synergy/Team Scorpion

08-16-2012, 09:15 AM	#6
jockstrap Registered Users Join Date: Dec 2006 Location: Sydney, Australia	It's to do with the 4.8V ratings referring to older nicad battery packs which, when fully charged were approx 6V rather than the nominal rated 4.8v .. A bit like a car batt rated at 12v but is actually 13.8v __________________ DX7 Mode-1 \| T-Rex 250 \| EP200SE V2 \| Tricopter \| Quadcopter 450 pro 6s fbl 3X1000 \| 450 pro fbl beastx \| Schweizer 300C Gasser Scale \|T-Rex550e 600 vbar \| Aeolus 50 HeliX T-Rex700 fbl Gasser \| HWC600 321puh Gasser fbl\| Henseleit TDR

08-16-2012, 08:37 AM	#5
chris982 Registered Users Thread Starter Join Date: Nov 2010 Location: Richmond, Virginia	I understand this but the specs say 4.8V. Wouldn't this cause a servo failure in the long run? I brought the step down but won't have any place to put it. So, I'm going without but don't want to crash the chopper. Why is it rated at 4.8V if it can do 6V?

08-21-2012, 03:11 AM	#8
TommyBear Registered Users Join Date: Nov 2011 Location: Australia	Regardless of what people say. I would still use the step down diode on the BLS 251. I have been using BLS 251 on my TDR, T700 and Logo 600SE with step down. __________________ Silverline VBAR 5.3 PRO : TDRs - LOGO 700 XXTREME 600SX 600SE - Whiplash - FAIFA SRIMOK

08-21-2012, 03:50 AM	#9
geekindenial Registered Users Join Date: Jan 2008	I use the Align two way step down to step down from 6v. Cheap and works.

08-21-2012, 04:27 AM	#10
CyprusFlyer Registered Users My HF Map location Join Date: Jan 2012 Location: Pissouri, Cyprus	Personal choice of course, but another point of failure in the way when the servo will run happily on 5.6 - 6v is not one for me. __________________ TREX 550E LOGO 500SE & 600SE & 600SX Synergy E7 zzzzzzzzzzzzzzTDR

08-21-2012, 04:44 AM	#12
chris982 Registered Users Thread Starter Join Date: Nov 2010 Location: Richmond, Virginia	I just returned my step down to amainhobbies. I didn't see Jan using it per the manual.

08-22-2012, 12:32 AM	#16
jhunter Registered Users Join Date: Oct 2009 Location: Richmond Va USA	I'll give you a step down if you want one but I have well over 100's of flights on bls 251's at 5.6 of the jive. __________________ TDR, Srimok N x 2, Banshee 31, avant aurora, Dune!

08-22-2012, 07:55 AM	#17
jointer Registered Users Join Date: Apr 2009 Location: Prague, Czech Republic	I had 700 flights with BLS251 at 6V from Jive - do not worry, it is working just fine. (i must say, better then the Outrage i have now) __________________ - TDR #2, 4525LE, YGE 160HV, MKS HBL950 (JR MP82S=crap), Outrage BL9188, Gryphon Quasar, silver Vbar + 2x sat, 12S Billowy 50C 5200mAh, Radix V2, EDGE 105mm, DX7 - TDR #1 sold (standart setup, 700+ flights) - HPI e-Firestorm FLUX, Spektrum DX3S

08-22-2012, 03:11 PM	#18
chris982 Registered Users Thread Starter Join Date: Nov 2010 Location: Richmond, Virginia	Thanks! I should be getting my kit shipped next month.

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