Stock Pursuit with 3660 1620kv 4S = 42.4mph?

[SD Eracer]

Looks good, did you do the throttle calibration with your ESC and transmitter?

[ydesigner]

Yes, I did the throttle calibration. Your instructions were perfectly clear, unlike the manufacturer's.

[Capt'n Crash]

My favorite prop so far for running my sport Pursuit with stock motor is a sharpened, balanced and thinned M445 I got here at OSE.

[ydesigner]

My favorite prop so far for running my sport Pursuit with stock motor is a sharpened, balanced and thinned M445 I got here at OSE.

Thanks. Just got my replacement/ upgrade motor in the mail today. Fried the stock motor last weekend. I got a Leopard 4082 1600kv which, hopefully, will be installed tonight. The X642 and M445 are the recommendations that keep popping up. I have a X440/3 that I want to try also. I still need to sharpen and balance that one.

[Turbo Dan-O]

Sweet! IMO, the M445 is an awesome prop for this boat. Mine picked up like eight MPH with the stock motor just changing to that prop.

[ydesigner]

Okay...... The weekend before last, I fried the stock motor. Insulation didn't cover the leads far enough into the can and, while it was probably short circuiting the whole time, the first attempt with 6S did it in.

Late last week my Leopard 4082 1600kv replacement/upgrade arrived. Here's the second attempt at 6S with the new motor. I'm still learning (which I love). The run ended with an abrupt end when impact with the water flung a connection loose. No damage! I do understand why I need to reinforce the hull if I'm playing this game. Hopefully you can see this short clip... Ironically, a borrowed GPS said top speed was 42.4 mph. This time I wonder if that reading was on the shy side.

I appreciate all of the helpful comments. I really like this forum.

https://www.youtube.com/watch?v=YMI5cncxsLY&feature=youtu.be

[fweasel]

link doesn't work for me.

[ydesigner]

Maybe now?

[Newboater]

Speed is definitely faster then before from the video it looks like you need to lower the strut a touch. It appears to be riding almost out of the water. You want to start with 30% COG. I use a wooden dowel on a flat service then balance the boat on that. Move the battery packs in the direction to achieve the balance and set the strut even or parallel to the bottom of the boat. Also set trim tabs level with the bottom, this should be your starting point as the Leopard motor is probably longer and heavier then the original SSS motor. Adding more fiberglass reinforcement will also add some more weight which can help settle the boat down. Also when trying to make fast passes try not to run over your own ripples from the first pass.

[Capt'n Crash]

You've come a long way in a very short time power wise. Your boat should be closer to 50+mph with that setup but until it is adjusted properly it will continue to be a handful.
I think you were just running with too much wake to get an accurate assessment of the boat's performance with 6s power.
I usually make my initial adjustments after running with flat calm conditions.

[ydesigner]

Newboater and Capt'n Crash,

Thanks again for the comments. Today I ran trying the de-tongued X440/3 prop on 4S. I did lower the stinger a little. The conditions were rough again. For that reason plus that I haven't reinforced the hull or produced a good way to secure the four 3S batteries, I did not run 6S. I was able to get some nice long runs in and it did seem faster than my other 4S runs. Despite the conditions, I managed to keep it under control, except for one flip where I was lucky enough to land upright. The borrowed GPS read 43.2 mph after the first run. That seemed believable and made me thing that last weeks run on 6S was faster than the 42.2 that the same GPS displayed. I chalked it up to not getting a long enough straight run on the 6S. Then something happened that has me questioning ALL of the readings. Still on 4S, the second run said maximum speed 79.0 mph. There's no way.....

[zooma]

I find that the G forces of any flip cause a wildly high GPS reading.

[ydesigner]

Interesting. Pretty sure the flip was on the first run though. Maybe a sudden slip through a turn?

[Capt'n Crash]

Just out of curiosity how is your hull holding up so far?
I assume you haven't reinforced it just yet.

[runningman]

I use a wooden dowel on a flat service then balance the boat on that.

How to do that with V-shaped boat?