HK/TFL Pursuit Mods

[MadProps]

i went this way because i already had a bunch of 3s lipos for my other boats .

me too
my temps were 90-95F
my LVC also kicked in so I lowered that setting because I run with LV alarms and a timer
I now have the hull dialed in will get a speed check tomorrow

what timing are you using I set mine to 11.25

thanks

[boatsrnew2me]

me too

what timing are you using I set mine to 11.25

thanks

same here

[Hydrocarbon82]

Talk about timing got me thinking. I believe I had mine set to 3.75 or even 0 degrees for another [delta wind] motor. I'm going to try 7.5 & 11,25 degrees next time, it should be interesting.

[MadProps]

talking about timing......
without a data logger what should one expect to see when advancing timing to get better running motors...hotter esc, motor, batts?

[Hydrocarbon82]

Yes everything will get hotter, more timing generally creates more load (amps). The "sweet spot" is generally no hotter than what a non He-Man can touch for over 5 seconds. Once you pass the "sweet spot" for a particular motor or setup, it will use a lot more amps for a marginal speed increase. In some cases you'll draw more amps but be slower, particularly true with delta-wind motors.

You can also lower timing below the sweet spot if you need less heat but can't prop-down, or if you need to run the hull wetter due to chop.

[MadProps]

Yes everything will get hotter, more timing generally creates more load (amps). The "sweet spot" is generally no hotter than what a non He-Man can touch for over 5 seconds. Once you pass the "sweet spot" for a particular motor or setup, it will use a lot more amps for a marginal speed increase. In some cases you'll draw more amps but be slower, particularly true with delta-wind motors.

You can also lower timing below the sweet spot if you need less heat but can't prop-down, or if you need to run the hull wetter due to chop.

thanks

[Hydrocarbon82]

I got the gps unit working and tested some old 4s turnigy batteries in parallel. Max was 48.6mph. The gens aces did a little better at 50.5mph.

The great thing about this gps is i don't have to pull the hatch off to check speed. I drive it next to the pier, connect via smartphone, and it spits out the numbers below. When i send a command it resets the max after saving it.

[Hydrocarbon82]

Slow-motion vids of the 48-50mph runs. Only time it chine walks is after a few decent waves at full speed. The turnigy batts put the CG 35-40% from the rear but didn't alter speed much.

[Hydrocarbon82]

It sounds pretty cool at half speed, almost like a full scale boat might from a distance

[Hydrocarbon82]

I set timing to 7.5*, raised the inner trim tabs just above flush, and trimmed the strut down 1/2 turn. Best speed was 51.8mph. It would start skipping on turns so I put the outer tabs down a bit, but it was also fairly rough water. I got some air a few times but this boat just don't want to flip. My last 2 boats would practically flip at random above 35mph, and trimming them down just lost speed.

[T.S.Davis]

Good ole' Pursuit. Great boats.

[runningman]

Cn you show what you changed lead teflon with? And how it looks like now.

[Hydrocarbon82]

Cn you show what you changed lead teflon with? And how it looks like now.

Unfortunately it looks virtually the same. Look at post #1 - picture #4 shows the 7/32" floating bushing already on the flex shaft and #5 shows the stinger with the 1/4" tube installed. First I pressed out the lead bushings by hand with a drift (towards the front), next I cut a 60mm length of 1/4" x 0.014" tube, then chamfered the edges & sanded the OD before pressing it in. I had to put the stinger on a wood block to tap the 1/4" tube in. I tried a drop of loctite but started grabbing before it was in half an inch.

I found a pic with the K&S tube in the stinger for a test fit:

[Insanity Plea]

I like the stinger mod, I was thinking of doing something similar, thanks for sharing. I've already done the 3/16 flex upgrade and installed a Leo 4075 1750kv, running 5s with a X642 from Dasboata. 48mph has been my best of two outings, stinger is strait, temps are around 110. Fun little boat to play with...

[MadProps]

Unfortunately it looks virtually the same. Look at post #1 - picture #4 shows the 7/32" floating bushing already on the flex shaft and #5 shows the stinger with the 1/4" tube installed. First I pressed out the lead bushings by hand with a drift (towards the front), next I cut a 60mm length of 1/4" x 0.014" tube, then chamfered the edges & sanded the OD before pressing it in. I had to put the stinger on a wood block to tap the 1/4" tube in. I tried a drop of loctite but started grabbing before it was in half an inch.

I found a pic with the K&S tube in the stinger for a test fit:

Im a little confused here are have you discarded the bushings completely and running on the 1/4 tube only?