Kbb34 repower, unbelievable!

[kfxguy]

I agree, but didn't you already just go from 6, to 7, to 8s in one day?

Yes, why? In the log it's showing 29.xx volts so that's the 8s runs. It only records for so long then over writes when you go over the max time. I made about 12 runs yesterday. Maybe more. But I know for sure that log is 8s because of the voltage.

[Brushless55]

I don't think so......anytime the sf loads data with the rpm as the vertical left line, the ceiling changes to the max rpm, which is the purple graph line. The blue line is throttle input, which flattens out at 100%, right where the rpm reaches the top of the graph.....37,919 was his peak rpm(loaded) on that run. Though his unloaded rpm would be over 44,000.

I don't think so, but I am understanding what your saying
just my opinion as I think he could actually be pulling more rpms
again the graph goes up 3,381 each line and stops at 37,919rpms
I don't think the program is allowing the full shot of his run to be seen of the max rpms
there is no head room in that screen shot like all the others who post readings of their runs
it's a total flat line at the top of the next line at 37,919
1500kv x 8s (3.7v) = 44,7000rpms (3.7v is during a load(average))
37,919rpms at 1500kv = 3.16v per cell (on Revo packs ?? )
the graph showed 28.8v and that could equal 43,200rpms
unloaded could be as high as 57,600rpms +

again I really don't think this program for some reason is allowing Travis to see his peak rpms of his actual run because it should show head room in the posted graph

[kevinpratt823]

uploadfromtaptalk1431959777128.jpguploadfromtaptalk1431959799046.jpg
Here are two of my logs from last week with the same esc and same logger configuration. Note the numbers on the side, along with the fact that the purple graph line peaks at the top.

[kevinpratt823]

Sorry, I think I put wrong attachments in last post.

Fwiw, under load the voltage times kv isn't necessarily the rpms.

[kfxguy]

I don't think so, but I am understanding what your saying
just my opinion as I think he could actually be pulling more rpms
again the graph goes up 3,381 each line and stops at 37,919rpms
I don't think the program is allowing the full shot of his run to be seen of the max rpms
there is no head room in that screen shot like all the others who post readings of their runs
it's a total flat line at the top of the next line at 37,919
1500kv x 8s (3.7v) = 44,7000rpms (3.7v is during a load(average))
37,919rpms at 1500kv = 3.16v per cell (on Revo packs ?? )
the graph showed 28.8v and that could equal 43,200rpms
unloaded could be as high as 57,600rpms +

again I really don't think this program for some reason is allowing Travis to see his peak rpms of his actual run because it should show head room in the posted graph

I dunno man. It's always showed like that on my computer. I looked at it again this morning and tried to expand the screen and make it taller and that's all I could get. It jives tho I think. That was the last passes when the batts were getting below 4v per cell. Last past after the run my checker said the were 3.84-3.85 per cell. So yea, voltage could have dropped. I've got another video I'm going to upload. First pass when batts were fresh. You can hear the rpm difference. And see the difference. Problem is I didn't start the dang gps.

[kfxguy]

Sorry, I think I put wrong attachments in last post.

Fwiw, under load the voltage times kv isn't necessarily the rpms.

I rest my case lol. Yours is the same thing. Now with a castle log it's different. It will go higher. I do like the castle logging much better than mgm or swordfish

[kfxguy]

For comparison here's a case log. I could put that Esc in the boat and log it.

[kevinpratt823]

Like I said, under load rpms are not directly proportionate to volts x kv. For an extreme example, if you stall a motor, the voltage does not drop to zero, the current just spikes until something cooks.

[kfxguy]

Here's another video. No gps. I want to say tho, my son seems to have radar eyes. If you watch the first video he guessed speed at 83.5...it was 83.6. He did this about five times in a row and was within .2-.3mph. Amazing if you ask me, or maybe pure luck. Listen what he says in this video.

[Bduncan]

Travis should I wait until you fall in love with Neu motors again before I put this Lehner and MGM 1k set up in my boat?

[Turbo Dan-O]

Awesome man! Please keep the info and videos coming!

[kfxguy]

Awesome man! Please keep the info and videos coming!

Thanks! I'm gonna go run it again this weekend with charged batts this time. I'm hoping for 87-88. Then I'll park it till we go on vacation. When I get back I'm thinking about trying a tp motor. I want to see how "budget" I can make this combo. The only thing that you can't cheap out on is the Esc I think. I'd rather have the overhead and logging feature. I'm thinking a 4070 1650kv. The only problem is I see to re-rated all their motors a lot lower since the last time I was on their website. Seems like before they were over rated as far as voltage and rpm go and now they seem under rated. I didn't see a 1500kv version, just 1650 or a 1440kv version. Not sure which to choose. Either way I go it's not what I want. O well, may just go with the 1650 version. If it destroy it, no big deal. Lol

[iridebikes247]

The swordfish software is pretty good. If you spin up on the bench it will show your max unloaded rpm, if you toss the boat in the water and only give it a blip, its likely the highest rpm you will see is what it hit under load. I run a twin and usually if I have a GOOD run the rpms are the same, if a prop lifts bad, well thats a different story lol.

I'd be torn over the 1650 and the 1440 too. In my experience the TP stated rpm is quite a bit closer to the actual number than some of the other motors out there. Neu drops off a lot under load, Lehner is spot on, Leopard drops off a lot.