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View Full Version : Senior Telemaster on only a 3S?


Mike Freas
12-18-2005, 01:20 AM
I watched Radio Controlled Hobbies last night on DIY. They did a special on outrunner motors and had Hobby Lobby bring out the birds and reps for the show. While discusing the instalation of a motor on the STM ARF Mike Hines from HL said they were flying it on only a 3S pack. I find that a bit odd. I thought the minimum was a 5S? I'd like some input on this because I'm about done with mine and was set on getting a 5S2P 8000 mah pack for it with an AXI 4130/18.

Twmaster
12-18-2005, 02:38 AM
Perhaps he misspoke?

Mike Freas
12-18-2005, 02:42 AM
Perhaps but I watched it again and he said a 3S pack and only 11.5 volts so the voltage and number of cells match.

Twmaster
12-18-2005, 02:46 AM
Well I suppose that would track. Perhaps send an email to sales@hobby-lobby.com ?

They have always been quick to reply to my inquiries.

Mike Freas
12-18-2005, 02:52 AM
Just shot them an e-mail. I will post up what they say.

Mike Freas
12-19-2005, 06:44 PM
I guess I was all wrong with my choice of battery and motor. Hobby-Lobby doesn't mess around, they sent this first thing this morning!

Mr Freas
The Senior Telemaster that is shown in the video:
http://www.hobby-lobby.com/media/HLA007-SrTele.wmv
is flown with the setup that we recommend, the AXI4120/18, with a 14x10 prop and a 16 cell NiMH pack. We have also flown it with both the 3 cell and 4 cell Lipo batteries. When using the 3 cell you need to increase the prop size to a 15 or even a 16" prop. I'm not sure which motor you are planning to use 4120/18 or 4130/16 (you said 4130/18). This model does not need anything larger than a 4120 series motor unless you are planning to aerotow or something of that sort. A 5S pack is entirely possible, you would just need to reduce the prop size to keep the amp load in line. I doubt that you would be able to use the additional RPM available with the higher voltage pack, the Telemaster is not a high speed model. If I can be of any help, let me know.

Michael Hines
Product Development Manager
Hobby Lobby International
(615) 373-1444 ext. 207

mmmdowning
12-19-2005, 07:09 PM
I thought that was probably the best show they've had.

Twmaster
12-20-2005, 12:41 AM
I guess I was all wrong with my choice of battery and motor. Hobby-Lobby doesn't mess around, they sent this first thing this morning!

...



Like I said. Always a fast response. I'd sure love to see that DIY segment. Perhaps I'll see if I can D/L it from somewhere. What show was it from?

Greg Covey
12-20-2005, 01:09 AM
Mike,

You can follow my Senior Telemaster thread (http://www.rcuniverse.com/forum/m_3587076/tm.htm) on RCU. I'm using an AXI 4130 and a 6s 6400mAh pack.

If you do the math, flying weight is 10.5lbs, so, if you want at least 65w/lb, that's 683 watts. Divide 683 watts by a 3s Lithium voltage of 10.8v (3.6x3) and you get 63amps. Not the best setup for a 4120 so I suspect the power level is less than our desired 683 watts.

On my setup, I'll have a 6s voltage of 21.6v and a max current around 50amps for a power level of 1080 watts or about 100w/lb. This will provide some extra power when needed to get out of a sticky situation, tow a sailplane, or lift a good sized payload.

Matt Kirsch
12-20-2005, 02:54 AM
To put it all in perspective... There's more than one way to skin a cat.

Greg's is a no-nonsense, high performance rig while Mike Hines's goes to show you what little you can get away with and still have a plane that flies really well.

I set up a guy in my club with a 4130/16 on 20 NiMH cells on his Senior Telemaster, on floats nonetheless. He's absolutely thrilled with it. That huge wing and the big, slow-revving prop are perfectly matched. He flies it all winter long out of the corn field across from his house.

Twmaster
12-20-2005, 02:59 AM
Darn you guys! There is a .60 size Telemaster hanging from the ceiling in my favorite LHS. This is just screaming for an E-Flite 60 outrunner!

Mike Freas
12-20-2005, 04:55 AM
I will most likely still go with a 5S pack and a 4120/18. On this set up I'm sure that the STM will lift my digital camera just fine. I'm more concerned about cost and flight times.

stanger89
12-28-2006, 09:20 PM
You know, on the subject of the RCH episode, did anyone else catch the comment at the beginning about the 70" Superstar? They stated it would fly for 20 minutes. Is that actually realistic on a high-performance aerobatic plane? I was looking forward to them talking about the power system in that but they never mentioned it.

redgiki
12-29-2006, 05:47 AM
stranger89: 20-minute flight times are easily achievable on a high-performance bird. Just size the bird bird's batteries appropriately. Remember, though, that "high performance" for a 3D hoverbat is a completely different kettle of fish than a high-speed racer.

Most hovering is done at 1/2 throttle, as are many 3D aerobatics. Usually, your amp draw at 1/2 throttle is about 1/4 that drawn at full throttle! For maximum LiPo life, you should target at least an 8-minute to 10-minute flight (6C-8C discharge). If your WOT static tests suggest you'll get an 8-minute flight wide-open, you should get far longer than that if you're hovering around at half-throttle.

stanger89
12-29-2006, 05:06 PM
Yeah, maybe I just don't like the pricetag associated with 20 minute flights, especially for a bird that size :p

ragbag
12-31-2006, 04:26 PM
I watched Radio Controlled Hobbies last night on DIY. They did a special on outrunner motors and had Hobby Lobby bring out the birds and reps for the show. While discusing the instalation of a motor on the STM ARF Mike Hines from HL said they were flying it on only a 3S pack. I find that a bit odd. I thought the minimum was a 5S? I'd like some input on this because I'm about done with mine and was set on getting a 5S2P 8000 mah pack for it with an AXI 4130/18.

I have a Senior Telemaster sitting on the shelf, Saito 72 with 2# lead in the belley to help the float in her.
That will be replaced with the 4130 and a rack of four cell A123's. Now I can get rid of the .45 caliber lead ball and put it back in my black powder bag.


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