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Old 06-23-2014, 04:59 PM   #31
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First Look at Trinity D4 Prototype, looks epic!-d4.jpg

Could be a typo, but states the same here.
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Old 06-23-2014, 05:09 PM   #32
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Yeah, I wouldn't trust this article in its entirety. Wait until trinity comes out with their own write up then you can complain about it.

http://www.rcnews.net/2014/06/23/tri...ops-the-new-d4
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Old 06-23-2014, 06:44 PM   #33
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With all the 3.5 BS... I wonder if/how long it will take to be ROAR approved...
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Old 06-23-2014, 07:44 PM   #34
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Originally Posted by Logi Maker View Post
With all the 3.5 BS... I wonder if/how long it will take to be ROAR approved...
Is already Roar approved.
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Old 06-23-2014, 08:57 PM   #35
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Originally Posted by Condor Speed View Post
Is already Roar approved.
I don't see it on the Roar list or in the Roar approval forums yet ? so until its there it isn't legal.

(it may have been sent and approved but Roar still need to put it on the list)

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Old 06-23-2014, 09:24 PM   #36
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Uses All D3.5 KillShot Stators
Regardless of this being a typo and should say "rotor" perhaps it means you *can* use Killshot rotars/stators, not that is uses one out the box. Ie, all your spares are good still.
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Old 06-23-2014, 09:51 PM   #37
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Originally Posted by Condor Speed View Post
Is already Roar approved.
Not on any ROAR list.
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Old 06-24-2014, 12:59 AM   #38
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Originally Posted by Logi Maker View Post
Not on any ROAR list.
They are waiting for the dealer spacifics of the roar part to be handled. First shipment should handle this and it will be on roar list by the end of next month.
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Old 06-24-2014, 06:30 AM   #39
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Originally Posted by howardcano View Post
At peak horsepower and 8V, a 17.5 motor draws about 90 amperes. Of course, the gearing is set so the average draw is much less.
Wouldn't that mean that at peak and 8v you are seeing 720 watts from a 17.5? That is around 1 hp!! That 90w figure doesn't add up.
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Old 06-24-2014, 07:17 AM   #40
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Originally Posted by d16dcoe45 View Post
Wouldn't that mean that at peak and 8v you are seeing 720 watts from a 17.5? That is around 1 hp!! That 90w figure doesn't add up.
I believe you meant 90A.

Your calculation is for input power. Output power is much less (by at least 50%).

But this does illustrate why they get so hot! A 540 motor can't dissipate 360W for very long before it melts down, so we gear for temperature. (Almost all of the normal motor/battery combos we run are similarly thermally-limited.) Not to mention that the batteries wouldn't last for the length of the race. And then of course there's the mitigating factor of not using full throttle for a large portion of a lap on a typical road course.

We were talking about the tabs, and although they don't look much different on the D4 versus other motors, oversized tabs could be a useful way to dissipate some heat. Maybe we'll see that in the future.
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Last edited by howardcano; 06-24-2014 at 07:27 AM.
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Old 06-24-2014, 07:20 AM   #41
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Sucks to be the guy who bought the prototype for $500.
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Old 06-24-2014, 07:31 AM   #42
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Quote:
Originally Posted by d16dcoe45 View Post
Wouldn't that mean that at peak and 8v you are seeing 720 watts from a 17.5? That is around 1 hp!! That 90w figure doesn't add up.
Tested quite a few 17.5s on my dyno. Current draw at peak power is usually around 55A. Peak power output is around 200W. This is from an 8.4v lipo.

Efficiency at peak power is around 40%, rising to a max of about 70% before trailing off.

Here is a Vampire 17.5 in blinky mode at max endbell timing.
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First Look at Trinity D4 Prototype, looks epic!-vampire-6.jpg  
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Old 06-24-2014, 07:37 AM   #43
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http://www.trinityrc.net/shop/index....product_id=610

Go buy one
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Old 06-24-2014, 08:07 AM   #44
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I'll wait for the new PULSE...
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Old 06-24-2014, 08:10 AM   #45
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Quote:
Originally Posted by daleburr View Post
Tested quite a few 17.5s on my dyno. Current draw at peak power is usually around 55A. Peak power output is around 200W. This is from an 8.4v lipo.

Efficiency at peak power is around 40%, rising to a max of about 70% before trailing off.

Here is a Vampire 17.5 in blinky mode at max endbell timing.
Thanks for the data, Dale. Did you measure the LiPo voltage during the run? It looks like the IR is pretty significant in your test, causing a large voltage sag. (This would not be surprising, given the low terminal resistance on a 17.5.) The low current draw and the fact that the power peak isn't at 1/2 the free-running RPM are clues for me.

If you'd like to discuss in a more suitable thread, let me know; I'm very interested. I'm sure you have plenty of practical experience to share!
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