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Big_Maxx · 04-05-2013, 09:12 AM

I'm thinking im going to pick up a 7HV at the toledo show this weekend so i've been trying to decide what electronics to go with.my question is what is the advantage of using HV servos vs. normal servos. i was looking at using the savox SC1258TG for cyclic and the Savox SH-1290MG on the tail but ther not HV. would these be good? any insight would be appreciated!

crf69 · 04-05-2013, 10:07 AM

i went 4525 ultimate motor....MKS HVBL servos.....and YGE 160HV 14t. Revco pinon.

BLAST!!!!!!!!

TheBum · 04-05-2013, 10:09 AM

There's nothing wrong with running your electronics on 6V. You will get a bit better torque at higher voltages, but the difference is not significant IMO. The main attraction to HV is using a lipo without a regulator. If you're planning to run a BEC, the line is muddier.

Ah Clem · 04-05-2013, 10:30 AM

"There's nothing wrong with running your electronics on 6V. You will get a bit better torque at higher voltages, but the difference is not significant IMO. The main attraction to HV is using a lipo without a regulator. If you're planning to run a BEC, the line is muddier."

Well stated, Alan!

Clay333 · 04-05-2013, 11:07 AM

Quote:

Originally Posted by Big_Maxx

I'm thinking im going to pick up a 7HV at the toledo show this weekend so i've been trying to decide what electronics to go with.my question is what is the advantage of using HV servos vs. normal servos. i was looking at using the savox SC1258TG for cyclic and the Savox SH-1290MG on the tail but ther not HV. would these be good? any insight would be appreciated!

I have the same cyclic servos on my 7Hv and they work just fine. I have never even considered upgrading them even when I had a set of Torqs that weren't being used. I had that tail servo on mine, but i did end up upgrading it. I went with the Futaba Bls251 and I am much happier with it. I would suggest going that route instead. You will be more happy in the long run.

P.I.Engineer · 04-05-2013, 11:59 AM

bls 451 on cyclic
bls 251 on tail

both at 6V on a wr bec

very happy.

GimpyGolden · 04-05-2013, 01:20 PM

Futaba BLS 452/251 combo here.
Run on Kosmik default BEC(5.6V) plenty strong and fast on a 700 and low current draw keeps BEC's happy.

Cadriel · 04-05-2013, 03:53 PM

If you run your cyclics at 6v through a bec do you need to run a stepdown for the tail? Or is the 251 happy at 6?

GimpyGolden · 04-05-2013, 04:00 PM

251 although rated as a 4.8V servo is fine @6V on a BEC.
A 4cell 4.8V battery hot of charge is about 6V. If you were to run it from a 6cell 6V Rx pack that would be ~7V hot off charge and could prematurely wear down servo.

Using a BEC you have a constant voltage of 6V if that's where you set it, no problems.

ckindt · 04-05-2013, 08:05 PM

No bec if you run straight off a Life pack.

Rob43 · 04-07-2013, 06:23 PM

Although I agree with the LiFe pack comment, not sure if it's best for a BLS251 since they are over 7 volts when freshly charged. Not saying you're wrong, but I believe there is added risk for that servo. An uneducated opinion mostly, but I fried the potentiometer on a servo in a nitro bird a few years ago, and the only explanation I could come up with was the 7.2V starting voltage. Maybe that wasn't the cause, but it haunts me a bit.

04-05-2013, 09:12 AM	#1 (permalink)
Big_Maxx Registered Users Join Date: Apr 2012	7HV pre-purchase questions?? I'm thinking im going to pick up a 7HV at the toledo show this weekend so i've been trying to decide what electronics to go with.my question is what is the advantage of using HV servos vs. normal servos. i was looking at using the savox SC1258TG for cyclic and the Savox SH-1290MG on the tail but ther not HV. would these be good? any insight would be appreciated! __________________ Big_Maxx (aka Big Nate) I don't believe in addiction... but i'm addicted to RC!!!

04-05-2013, 10:07 AM	#2 (permalink)
crf69 Registered Users My HF Map location Join Date: Aug 2011	i went 4525 ultimate motor....MKS HVBL servos.....and YGE 160HV 14t. Revco pinon. BLAST!!!!!!!! __________________ you should look into it...........

04-05-2013, 10:09 AM	#3 (permalink)
TheBum HF Support My HF Map location Join Date: Jul 2007	7HV pre-purchase questions?? There's nothing wrong with running your electronics on 6V. You will get a bit better torque at higher voltages, but the difference is not significant IMO. The main attraction to HV is using a lipo without a regulator. If you're planning to run a BEC, the line is muddier. __________________ Alan (just call me "Bum"; no need to be so formal) HeliFreak Support Protos Max Evo 700 (Brain 2), Protos Max V2 770 (iKON 2), Synergy 516 (Brain 2), Oxy 2 (Falcon 12) Graupner MZ-32 Experience is something you gain only after you need it. I wouldn't mind social media so much if it didn't involve people.

04-05-2013, 10:30 AM	#4 (permalink)
Ah Clem Registered Users Join Date: Jan 2006	"There's nothing wrong with running your electronics on 6V. You will get a bit better torque at higher voltages, but the difference is not significant IMO. The main attraction to HV is using a lipo without a regulator. If you're planning to run a BEC, the line is muddier." Well stated, Alan! __________________ KBDD-Team Captain, JR DFA Team Pilot. Forza 450, Forza 600N, Forza 700, Compass 6HV-U, Warp, 7HV,Knight Pro,Knight 3D, Atom, Odin II, 6HV, 3D Plus, Knight 50, Chronos, Velos, Steam 550 and 600, OMP M2 (and anything else I can get my hands on...).

04-05-2013, 11:59 AM	#6 (permalink)
P.I.Engineer Registered Users Join Date: Jan 2009 Location: Maple Valley'ish, WA	bls 451 on cyclic bls 251 on tail both at 6V on a wr bec very happy. __________________ XLPower Specter V2 - Rotorflight - ELRS OMP M2 Explore - Rotorflight - ELRS TX: Fr-Sky X9 Lite S / RM Pocket - EdgeTX - ELRS

04-05-2013, 01:20 PM	#7 (permalink)
GimpyGolden Registered Users My HF Map location Join Date: Nov 2009	Futaba BLS 452/251 combo here. Run on Kosmik default BEC(5.6V) plenty strong and fast on a 700 and low current draw keeps BEC's happy. __________________ Scott Team RotorQuest

04-05-2013, 03:53 PM	#8 (permalink)
Cadriel Registered Users Join Date: May 2011	If you run your cyclics at 6v through a bec do you need to run a stepdown for the tail? Or is the 251 happy at 6? __________________ [ Compass 7hv V2 \| SK540 \| RJX ] [ Gaui X5 FES \| Skookum 540 ] [ 14SG ] In a mad world, only the mad are sane.

04-05-2013, 04:00 PM	#9 (permalink)
GimpyGolden Registered Users My HF Map location Join Date: Nov 2009	251 although rated as a 4.8V servo is fine @6V on a BEC. A 4cell 4.8V battery hot of charge is about 6V. If you were to run it from a 6cell 6V Rx pack that would be ~7V hot off charge and could prematurely wear down servo. Using a BEC you have a constant voltage of 6V if that's where you set it, no problems. __________________ Scott Team RotorQuest

04-05-2013, 08:05 PM	#10 (permalink)
ckindt Registered Users Join Date: Jun 2007	7HV pre-purchase questions?? No bec if you run straight off a Life pack. __________________ 7hv

04-07-2013, 06:23 PM	#11 (permalink)
Rob43 Registered Users Join Date: Oct 2008 Location: Midland, Michigan	Although I agree with the LiFe pack comment, not sure if it's best for a BLS251 since they are over 7 volts when freshly charged. Not saying you're wrong, but I believe there is added risk for that servo. An uneducated opinion mostly, but I fried the potentiometer on a servo in a nitro bird a few years ago, and the only explanation I could come up with was the 7.2V starting voltage. Maybe that wasn't the cause, but it haunts me a bit. __________________ = Rb43 =

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