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HomeAircraftHelicopterMain Discussion › What hot servos are left for 4.8v die hards?
11-21-2006 12:39 PM  11 years agoPost 21
jurgen

rrApprentice

Weybridge, Surrey, UK

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I think 2S lipo ready systems are on their way....

CSM's 720 gyro can handle 8.4V, the KO servos mentioned earlier can handle 7.4V, the new Spread Spectrum RX from Xtremepower Systems (Xtremelink, not yet on market but coming...) can handle higher voltage (upto 16V!!).

So it seems the 7.4V systems are closer than ever....

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11-21-2006 02:38 PM  11 years agoPost 22
jschenck

rrProfessor

La Vista, NE.

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If you'd like to use Futaba servo's with quality JR connectors, why not buy JR 6" leads and splice them on? You'll get the JR factory connector quality, simpler installation and nice inexpensive reliable 9252's.

I'd like to see the radio manufactures make 'native' 7.4V equipment through and through. It's my understanding that some have lost heli's due to regulators failing and that added expense/point-of-failure is keeping me from lipo/li-ion. Plus with the extra equipment you generally loose the weight advantage which is one of the main attractions to the lithium batteries IMO.

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11-21-2006 03:19 PM  11 years agoPost 23
red_z06

rrProfessor

Dumont, NJ

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What do you guys normally pay for Futaba 9252s?

www.JustinJee.com

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11-21-2006 03:26 PM  11 years agoPost 24
marked23

rrKey Veteran

Lynnwood, WA

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$65 to $75 each.... the 9252 is likely the best bang-for-the-buck servo ever.

Some places sell them without the retail boxes... I've bought them that way. They come in a plastic bag, but are fully new, complete, and waranteed. That's how you get the best price.

-Mark

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11-21-2006 03:41 PM  11 years agoPost 25
nojohnny101

rrElite Veteran

10 miles north of Cincy, OHIO

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hey
marked23...can you specify where???

Thanks
~Will~

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11-21-2006 04:19 PM  11 years agoPost 26
rchelichop

rrVeteran

seeya

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That would be sweet.
If only the 611 would work on 7.4v then I could go for it. Hmm.. Why don't the gyro makers build a regulator into the design of the gyro amp? I would guess/hope that somebody is working on that.
Doubt it'll be built into the gyro amp any time soon, but you can get a Arizona regulator, and it'll seperately regulate the gyro servo down to 5.1 v and then the other servos can be set at whatever voltage you want.

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11-21-2006 04:49 PM  11 years agoPost 27
jschenck

rrProfessor

La Vista, NE.

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marked23...can you specify where???
Try Heliproz

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11-21-2006 05:28 PM  11 years agoPost 28
sharam

rrElite Veteran

Northern California - Fly at Morgan Hill Field

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IMO, the ideal system will allow for high voltage to be distributed only where it's required, e.g., servos, and lower voltage to be distributed where it's required, e.g., receiver, governor, gyro sensor and amp. I can envision a system where the unregulated voltage is fed into the servos and a regulated voltage is used on the other items. I really don't think RC electronics mfrs will redesign a major chunk of their rcvr/gvrnr/electronics to run on 7.4+ volts just because the servos should be running higher voltages.

This will make for a slightly more complicated system but it will be worth it.

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11-22-2006 06:58 PM  11 years agoPost 29
Barney

rrKey Veteran

Inverness Scotland

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As a footnote about KO propo 2123 servo. They have an Extra flylead allowing you to take a tap directly from your 2 cell Lipo/Lion to run at 7.4v.

The 2123 is 9Kg? with a 0.06 transit. This makes for CCPM performance in a mCCPM model

They also do a full range of other servo's rated for other voltages

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11-22-2006 07:02 PM  11 years agoPost 30
Furious Predator

rrProfessor

Kitchener, Ontario, Canada

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using that lead is the only way to make the servo work. its needs atleast the 7.2volts its made for.
a friend of mine has them on his Fury....which is really a FURY!!!
they will be on my Vigor by the end of winter as well.

Clicky HERE for link to 2123 servo.

Shawn
Team Leisure-Tech
Team HelixRC

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11-22-2006 07:12 PM  11 years agoPost 31
PaulJC

rrElite Veteran

Hertfordshire UK

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I was under the impression that the reason we ran regulators was for consistant speed/torque from the 1st flight to the last, these new servos are great that run 7.? volts but are we not going full circle going back to servos that are run direct from the battery so that speed/torque will decay as the battery voltage drops.

I must get some of those JR servos, awesome spec for 6v

Re-entering the atmosphere...

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11-22-2006 07:46 PM  11 years agoPost 32
azzi_b

rrNovice

rotherham, England

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you can buy the plastic ends for the servo leads from places like farnells or digikey. Look under pin headers and crim housing - they are data / signal connectors. I bought a load to do the job you are wanting to do - just removed the plastic end off the plug and replaced it with a new one - also handy if you want to replace a worn plug or shorten exisiting servo leads.

cost was about £1.10 for 10 plugs with crimp on ends.

Aaron

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11-22-2006 08:58 PM  11 years agoPost 33
Roamer

rrVeteran

Albuquerque, NM

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but are we not going full circle going back to servos that are run direct from the battery so that speed/torque will decay as the battery voltage drops
Short answer: No.

Long answer: The voltage decay you are referring to is for Nicads and NiMh batteries. It does not really impact Lipo batteries at all. They pretty much maintain voltage right up until they dump. That is why when the lipo starts to show lower voltage, the fun is done!

-RRRoamer

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11-22-2006 10:58 PM  11 years agoPost 34
PaulJC

rrElite Veteran

Hertfordshire UK

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I agree with lipos it will effect the process less but you will still lose some speed/torque while dropping from fully charged voltage to no fly voltage.

Ohms law proves this as fact or do these servos carry there own internal regulation?

The 7.2v servos have not been introduced to the heli market to cater for lipo use, they are a RC car product to run of 7.2v 6 cell packs.

I'm not flaming or trying to put down any one or any product but i do feel this is going full circle

Re-entering the atmosphere...

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HomeAircraftHelicopterMain Discussion › What hot servos are left for 4.8v die hards?
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