Understanding HV sytems - RCCanada - Canada Radio Controlled Hobby Forum
RCCanada - Canada's Radio Control Hobby Forum
Electronics Discuss radios, chargers, etc...

Reply
 
Thread Tools Display Modes
Old 07-08-2016, 04:13 PM   #1
Myzee
RCC Pro Contributor
 
Myzee's Avatar
 
I am: Myles Jarvis
Join Date: Oct 2002
Location: Picton, Ontario
Radio of choice:
Futaba

Feedback: 5 / 100%
Posts: 1,615
Total Props: 1
Understanding HV sytems


       Remove this ad - become a site supporter!
Don't want to sound like a total newb here. Just understanding this HV stuff.
So.....I'm thinking about getting a new radio system. I've flown Futaba since the beginning of time but doesn't mean I may purchase another Futaba system.
So with a HV system, I need a HV receiver with HV servos and Life battery pack to power them? Will also need a charger compatible to charge Life batteries. Correct?

What are the advantages to HV systems? I flown typical setups for ever and really have not had any real problems.
Again not trying to sound like a radio virgin, just making sure I understand because no question is a stupid question!
Thanks!
__________________
Howzitgoin' eh?
Myzee is offline   Quick reply to this message.

Sponsored Links - Subscribe to remove this ad.
Old 07-08-2016, 04:40 PM   #2
twistedge
___\_(ツ)_/___________
★ Site Supporter ★
 
twistedge's Avatar
 
I am: Ed
Join Date: Apr 2012
Location: Oakville, Ontario
Radio of choice:
DX8
# of RCs:

Feedback: 63 / 100%
Posts: 614
Total Props: 8
Re: Understanding HV sytems

I think the main advantage of HV servos is being able to run them directly from a 2S lipo (No BEC or regulator). Life also works, but you'll get a higher nominal voltage from the lipo. Lipo offers the top end of the speed/torque and allows them to draw all the current they want. A convenient, no fuss option.

I'm not sure about the Futaba receivers, but even older Spektrum Rxs were designed to handle up to 9.6V.
twistedge is offline   Quick reply to this message.
Old 07-08-2016, 04:52 PM   #3
Myzee
RCC Pro Contributor
 
Myzee's Avatar
 
I am: Myles Jarvis
Join Date: Oct 2002
Location: Picton, Ontario
Radio of choice:
Futaba

Feedback: 5 / 100%
Posts: 1,615
Total Props: 1
Re: Understanding HV sytems

A quick look at the Futaba 10JA system shows the included receiver is good to 7.4v.
So what would happen if I used the trusty Hitec 645 servo with this system running a 6.6v Lifepack? Would the extra voltage kill the servo? I suppose it's not worth taking the chance.
__________________
Howzitgoin' eh?
Myzee is offline   Quick reply to this message.
Old 07-08-2016, 05:04 PM   #4
JoeT
RCC Expert Contributor
 
JoeT's Avatar
 
I am: JoeT
Join Date: Mar 2004
Location: Maple, Ontario, Canada
Radio of choice:
Was a Futaba, Now a Tyrant with Taranis.
# of RCs: 5

Feedback: 11 / 100%
Posts: 850
Total Props: 9
Re: Understanding HV sytems

Most manufacturers support HV
Receivers support HV
Servos - Must use HV Servos
NON HV Servos will either work for a short time, forever, or not at all (it's a crapshoot) on HV. You can get away with running LV servos at 6V, but 6.6 and above is pushing it.
Most electronic ignitions will run from 6V up to 8.4
Some Electronic ignitions rated at 4.8 will run ok up to 6V

So in summary:
If you're buying a new radio, your only concern will be the type of servos you decide to use.
__________________
Not just any old Joe.. LOL
Almost ancient MAAC Number 28296
R/C 400 Club, Toronto RCFC
JoeT is offline   Quick reply to this message.
Old 07-08-2016, 05:11 PM   #5
Myzee
RCC Pro Contributor
 
Myzee's Avatar
 
I am: Myles Jarvis
Join Date: Oct 2002
Location: Picton, Ontario
Radio of choice:
Futaba

Feedback: 5 / 100%
Posts: 1,615
Total Props: 1
Re: Understanding HV sytems

Thats what I was thinking. Thanks
I still use my Futaba 9C on 72mhz so I was thinking of: A)Buy a new system, B) switch the module out for a 2.4ghz and get a 2.4 receiver.
So just want to make sure I have it sorted out with this HV stuff first. LOL
It's strange to me because it's been awhile since I really looked at radio systems and so much has changed!
__________________
Howzitgoin' eh?
Myzee is offline   Quick reply to this message.
Old 07-08-2016, 05:17 PM   #6
Myzee
RCC Pro Contributor
 
Myzee's Avatar
 
I am: Myles Jarvis
Join Date: Oct 2002
Location: Picton, Ontario
Radio of choice:
Futaba

Feedback: 5 / 100%
Posts: 1,615
Total Props: 1
Re: Understanding HV sytems

One last question which is going to make me sound real dumb here...how do you power the servo directly from the battery? How are you guys running your setups?
__________________
Howzitgoin' eh?
Myzee is offline   Quick reply to this message.
Old 07-08-2016, 06:45 PM   #7
davidmc36
Level 3 Supporter
★ Site Supporter ★
 
davidmc36's Avatar
 
I am: David C
Join Date: Jul 2010
Location: Morewood, ON
# of RCs: 25

Feedback: 76 / 100%
Posts: 3,219
Total Props: 45
Re: Understanding HV sytems

Quote:
Originally Posted by Myzee View Post
...power the servo directly from the battery...
One example. Powered from the distribution board, not the Rx.

http://flitetest.com/articles/Giant_...r_Distribution

Or:

http://www.powerbox-systems.com/en/p...evolution.html
__________________
No Bounce-No Play
The one who dies with the most toys wins!
Electric flying is pretty much seeing how close to a dead short you can run without setting it on fire.
34453
davidmc36 is offline   Quick reply to this message.
Old 07-08-2016, 07:23 PM   #8
CF105
Level 3 Supporter
★ Site Supporter ★
 
CF105's Avatar
 
I am: Kevin Drayson
Join Date: Feb 2011
Location: Moncton NB
Radio of choice:
Spektrum DX8
# of RCs: n+1

Feedback: 6 / 100%
Posts: 831
Total Props: 9
Re: Understanding HV sytems

Just as an example, I'm running 6 HS-645 servos, electric retracts and receiver off a two cell LiFe pack in my H9 Thunderbolt. No regulator, just plugged into a channel on the rx. Nary a problem, hiccup or glitch.
CF105 is offline   Quick reply to this message.
Old 07-08-2016, 09:28 PM   #9
Myzee
RCC Pro Contributor
 
Myzee's Avatar
 
I am: Myles Jarvis
Join Date: Oct 2002
Location: Picton, Ontario
Radio of choice:
Futaba

Feedback: 5 / 100%
Posts: 1,615
Total Props: 1
Re: Understanding HV sytems

Well that actually cleared up a lot guys! Thanks for the help!
That video in the Flite test link helped big time. All makes sense now!
__________________
Howzitgoin' eh?

Last edited by Myzee; 07-08-2016 at 09:32 PM. Reason: Forgot to add..
Myzee is offline   Quick reply to this message.
Old 07-08-2016, 10:13 PM   #10
cosmith
RCC Senior Contributor
 
I am: Cory S
Join Date: Oct 2013
Location: Waterloo, ON
Radio of choice:
Spektrum
# of RCs: 10+

Feedback: 15 / 100%
Posts: 693
Total Props: 13
Re: Understanding HV sytems

6.6v Life batteries are fine with LV servos, a fully charged NIMH battery is giving you roughly the same voltage anyway. Life chemistry provides 6.6v from fully charged to nearly dead...disadvantage being it is hard to accurately tell what state of charge they are in.
cosmith is offline   Quick reply to this message.
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the RCCanada - Canada Radio Controlled Hobby Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Member names may only be composed of alpha-numeric characters. (A-Z and 0-9)

!!ATTENTION ADVERTISERS!! If you intend on advertising anything on this forum, whatsoever, you are required to first contact us here . Additionally, we do NOT allow BUSINESS NAMES unless you are an Authorized Vendor. If you own a business, and want to do sales on this site via posting or private message, you will need to follow the rules. Shops, Stores, Distributors, Group Buys without being authorized will see your account terminated.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Your Name
Your first name and last initial is required if you plan on using the forum.
Location
Which city & province you live in. This is mandatory for classified listings.
Radio of choice?
Which radio is your current favorite to use?
Number of RC Vehicles?
How many boats, cars, planes do you own?

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
vBulletin Message

Thread Tools
Display Modes

Forum Jump


All times are GMT -5. The time now is 09:09 AM.


vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.