HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Dec 15, 2012, 05:48 PM
Yin & Yang
Liberty10's Avatar
United States, VA, Sterling
Joined Jul 2011
4,401 Posts
Aero
Got a few question about those Savox SC-1267SG. How's the centering on them. Do you think they'll be good for the 78" MXS when it comes out? And at 15% off I'm thinking of getting them now. What do you think the count needed is. Not positive on savox yet. But the price sounds mighty good. I was looking at these. The "Ultra Torque" HS-7940TH
Oh and can you tell what they mean by unique steel gears?
Liberty10 is offline Find More Posts by Liberty10
Reply With Quote
Sign up now
to remove ads between posts
Old Dec 15, 2012, 09:54 PM
Not as Good as The Kid
Aeroplayin's Avatar
South Pasadena, FL
Joined Sep 2009
7,250 Posts
I'm going to have to let Tom answer this when he has a few flights under his belt with the new 78. The red one that he flew at Deland (in the video) was Frankjp's 78, converted from a 30cc engine, and the bulkier gas version with the electric setup is 11 oz heavier than Tom's e-version. Frank also has JR HV servos in his. The SC-1267SG are in the new plane, five of them, but there are only two full flights on the plane so far, getting the mixing and and trim dialed in. We're also testing the Xoar PJN and the Mejzlik 'e' 22x10's. We'll probably be out a lot while Tom's on break from school until January 7th.
Aeroplayin is offline Find More Posts by Aeroplayin
RCG Plus Member
Reply With Quote
Old Dec 16, 2012, 07:36 AM
Shut up and Fly!!!
jw357_23043's Avatar
United States, VA, Hartfield
Joined Aug 2011
1,005 Posts
Quote:
Originally Posted by Aeroplayin View Post
I would say that this is the correct ZTW: http://www.altitudehobbies.com/brush...sc-opto-no-bec

There is no BEC no matter what the description bullet-points say. And I have no idea why the confuse the issue by calling it a Land ESC. Someone should fire their marketing guy. Nothing like having to educate your prospects.

Also, you don't need an external U-BEC for this setup IMO for two reasons. First, you are creating another failure point, and second, no one I know has yet to have an issue with running the 2S lipo right into the Rx, unregulated. I've done it with 2S Lipos at 7.4v to 8.4v, as well as 2S A123 LiFe to 6.6v plus on new and old Rx's.

Put a 3 inch extension in the Rx and plug and unplug the battery into the extension, or add a switch in between the battery and the Rx, which is what I did on the 78.
I run the 6.6 Life unregulated with a switch and it has worked well on my 70". I always thought you had to regulate the lipo's but I guess I was wrong.
jw357_23043 is offline Find More Posts by jw357_23043
Reply With Quote
Old Dec 16, 2012, 07:42 AM
Team Twisted!
hone1er's Avatar
United States, CA, Hercules
Joined Dec 2011
4,318 Posts
Quote:
Originally Posted by jw357_23043 View Post
I run the 6.6 Life unregulated with a switch and it has worked well on my 70". I always thought you had to regulate the lipo's but I guess I was wrong.
You don't have to regulate a 2s lipo if you're running HV servos. They run fine on a fully charged 2s lipo. That's why when i run HV servos with a BEC i set the BEC to 8.2v.
hone1er is online now Find More Posts by hone1er
Reply With Quote
Old Dec 16, 2012, 10:45 AM
Not as Good as The Kid
Aeroplayin's Avatar
South Pasadena, FL
Joined Sep 2009
7,250 Posts
Quote:
Originally Posted by jw357_23043 View Post
I run the 6.6 Life unregulated with a switch and it has worked well on my 70". I always thought you had to regulate the lipo's but I guess I was wrong.
I usually use 2S LiFePO4 batteries unregulated when not using HV servos on the AR7000 Rx. The Godfrey has JR 8611A servos and the AR9100 Rx can manage redundancy, so we use 2x 2S 2300mAh A123 batteries.

We used this 9100 setup on two other planes with no issues. The analog JR servos are rated to 320 oz./in of torque on 6v so I'm going to guess we were guaranteeing that on a minimum 6.6v.

I used a single unregulated 2S 1100mAh A123 on slow 133 oz./in analog Hitec's several years ago on an 8 pound 3D plane with a Saito 120 swinging a 16x6 glow prop and huge control surfaces, and the same setup when I converted it to electric with a 110 motor swinging an 18x8 woodie on 8S.

The EF 78 now has a 2S 2100mAh Lipo on HV servos and this is the first time we are using LiPo's in this configuration. More flights are needed for an independent verdict on unregulated 7.4v power to digital servos.

Considering how we like to test the limits, we may still experiment with a 3S Lipo (11.1v) or A123 (9.9v) on a regulator, like a BEC Pro, and try a little higher voltage setting once Tom gets the feel for the current 2S unregulated LiPo setup -- like 8.4v, which means the regulator would guarantee this voltage level regardless of battery sag or capacity. This would be up to him since he can tell if he is getting the most from the servos a lot sooner that I would.

He enjoys a certain level of performance, and I enjoy trying to give it to him. Frankjp is very experienced as well and we typically kick options back and forth. He has some great ideas too and this has become a joint effort, which has made it a lot of fun. I don't think that either of us had stock engines in our cars right through our 20's, so why should we settle now?
Aeroplayin is offline Find More Posts by Aeroplayin
RCG Plus Member
Reply With Quote
Old Dec 16, 2012, 11:30 AM
bryansifsof44's Avatar
United States, AK, Anchorage
Joined Oct 2011
4,731 Posts
I also run a CC 10 amp and a BEC pro with HV servos... With the 10 amp I could adjust in 0.1V increments and run 8.3V to the 7245... Super fast and strong. I have we'll over 100 flights with absolutely no issues.
With the Pro I run the 7054SH at 8.0V because they are only on 0.5V increments and the next step up is over spec. They are also super strong and fast. 25 flights so far on that setup and working great. Hopefully with the next firmware update they will give us finer adjustment with the Pro.
bryansifsof44 is online now Find More Posts by bryansifsof44
RCG Plus Member
Latest blog entry: Weights for planes
Reply With Quote
Old Dec 16, 2012, 10:28 PM
The wind caused that!!
hoghead5150's Avatar
United States, OK, Poteau
Joined Jul 2012
617 Posts
well i'm trying to get my list around and i think i've got my power system figured out. if ya'll would let me know if i'm making some mistakes, or if this sounds about right.

48" edge 540
motorfly dm2820-685 motor
ztw b-series 85a esc
xoar 14x7e prop
castle creations 10a bec
savox 255 servo's all around.
haiyin 2650MaH 4s batteires

so how does this setup sound to ya'll? i would like to run a little bigger battery for some extended flight times, but not sure how the weight would affect everythiing.
hoghead5150 is offline Find More Posts by hoghead5150
Reply With Quote
Old Dec 16, 2012, 11:21 PM
bryansifsof44's Avatar
United States, AK, Anchorage
Joined Oct 2011
4,731 Posts
Looks like a pretty kick butt system... I run the 2650s which is about perfect. I've 3Ded with 3300s but not ideal. Others like 2200s.
bryansifsof44 is online now Find More Posts by bryansifsof44
RCG Plus Member
Latest blog entry: Weights for planes
Reply With Quote
Old Dec 16, 2012, 11:53 PM
VOLTS > AMPS
stgdz's Avatar
United States, MN, Buffalo
Joined Jul 2011
3,867 Posts
no reason to go 85 amp or a 10amp bec.

I believe that ztw has a 6v 6amp bec, 60 amp would be fine. May be able to even use a 50amp.
stgdz is offline Find More Posts by stgdz
Reply With Quote
Old Dec 17, 2012, 12:05 AM
bryansifsof44's Avatar
United States, AK, Anchorage
Joined Oct 2011
4,731 Posts
According to the spec the 85 is only 2g more the 65 amp and gives you more options in the future. Not needed, but if speced weight is right why not. BEC is 5 amp should be enough, but they are digital servos which burn more power, so the external is a lightweight piece of mind.
bryansifsof44 is online now Find More Posts by bryansifsof44
RCG Plus Member
Latest blog entry: Weights for planes
Reply With Quote
Old Dec 17, 2012, 12:08 AM
The wind caused that!!
hoghead5150's Avatar
United States, OK, Poteau
Joined Jul 2012
617 Posts
thanks guys. i was thinking about getting a bigger esc than i need right now so that later on i might be able to use it in a 60" when/if i step up.

i was wondering about the external bec. i have a hard time trusting the internal bec's on higher power servos and thought it might be cheap insurance. or piece of mind,,,, either way!!
hoghead5150 is offline Find More Posts by hoghead5150
Reply With Quote
Old Dec 17, 2012, 12:16 AM
Yin & Yang
Liberty10's Avatar
United States, VA, Sterling
Joined Jul 2011
4,401 Posts
Sounds like 245 watts/lb of kick A$$ fun
Liberty10 is offline Find More Posts by Liberty10
Reply With Quote
Old Dec 17, 2012, 12:22 AM
The wind caused that!!
hoghead5150's Avatar
United States, OK, Poteau
Joined Jul 2012
617 Posts
i've been talking with aeroplayin and dead for a bit about this stuff. they have helped me alot. i've learned so much from them in a short time. thought i knew a little, found out what i knew was mostly wrong!! i'm getting it now tho.

not dead set on the esc. i would like the castle ice esc, but can get an eflite 80 amp alot cheaper. i will be doing mostly sport flying to start with as this will be my first 3d style plane. my plans are to slowly work my way into doing 3d stuff, but i don't want to rush it. right now it's sim time helping me get ready. my eflite apprentice and my parkzone albatros are fun, but i'm ready for something more!

the yak is my favorite plane, so i will be getting one of those as soon as EF releases them. would like a 60" version but will take what i can get.
hoghead5150 is offline Find More Posts by hoghead5150
Reply With Quote
Old Dec 17, 2012, 09:06 AM
Shut up and Fly!!!
jw357_23043's Avatar
United States, VA, Hartfield
Joined Aug 2011
1,005 Posts
Quote:
Originally Posted by hoghead5150 View Post
well i'm trying to get my list around and i think i've got my power system figured out. if ya'll would let me know if i'm making some mistakes, or if this sounds about right.

48" edge 540
motorfly dm2820-685 motor
ztw b-series 85a esc
xoar 14x7e prop
castle creations 10a bec
savox 255 servo's all around.
haiyin 2650MaH 4s batteires

so how does this setup sound to ya'll? i would like to run a little bigger battery for some extended flight times, but not sure how the weight would affect everythiing.
I'd go with the CC Ice Lite 50 ESC. The weight is around 48 grams and there are a lot of cool programming options. I run one in my 48" MXS.
jw357_23043 is offline Find More Posts by jw357_23043
Reply With Quote
Old Dec 17, 2012, 10:01 AM
They Call him Dead!
YellowJacketsRC's Avatar
United States, SC, Pawleys Island
Joined Jul 2003
7,063 Posts
There is nothing wrong with the internal BEC on many of the available ESC. The Airboss 85 seems to be bullet proof with 6 volts to power the servos. But if you are going to use HV servos then you need a CC 10 BEC or a separate 2 cell, 450 Mah lipo to power the servos.

I don't know the E-flite esc. Why not stick with the ZTW u listed? Pretty sure that AP has proven that to be rock solid and the price is right.
YellowJacketsRC is offline Find More Posts by YellowJacketsRC
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Question RC kits for experimenting with flight control systems SubZer0 DIY Electronics 11 Oct 12, 2011 09:58 AM
Wanted left wing for extreme flight yellow and black 74 yak hondaboy92hatch Aircraft - Fuel - Airplanes (FS/W) 0 Sep 29, 2011 11:18 AM
Discussion Extreme power systems & Royal Evo 12 rbehrends Radios 5 Oct 11, 2007 06:55 PM
Discussion Battery for Logo 10 - Thunder Power "eXtreme" 5S 4600 or Flight Power 5S 3700? WeatherB Electric Heli Talk 6 Jan 25, 2007 11:29 PM