What prop should I get? Lucas oil

[SD Eracer]

I will try the 10 Pack at HF. I normally use the Hockey tape from Kinetic and it sticks real good but not this morning. I got another x642 coming from Dasboata. My orginial from Rocket city decided it wanted a divorce from Miss Geico and left her for some other fish in the sea last run. Lol

I love Hockey Tape, but I prefer to use it on my old beater HPR that already has a beat up finish. That boat of course uses lock screws, so the tape is only for water proofing, but at 80+ mph, you want hockey tape.

But just remember that hockey tape will eventually destroy your finish. Some people will apply a clear tape over the area that's semi-permanent. So when you apply and remove tape constantly, it's only hurting the tape and not the paint under it.

As for Dasboata, they are fantastic. I will mention though that Octura props are some of the easiest props to sharpen and balance. They have some rough flashing that's easy to remove, and they are pretty sharp to begin with. I can usually S&B a X642 in about 20 minutes.

[MADRCER]

Done a few test with different props and the replacement 1800kv motor if anyone is curious on the speed differences between them on my set up. No strut adjustments were made only prop swaps and the test were all done on the same exact day and water conditions (average with some mild chop). The boat still has more in it but I wanted to find out which prop I liked best and be faster for me then I will fine tune the boat for maximum speed without blowing over.

Batteries 2x Zippy 2s 5000mah 45c
42x55 Grim 43.6mph (sharpened and balanced by me). This prop would probably get 44.5mph with the nano tech 6.6 batteries since they traditionally pull another mph than my others
Prather 220 s&b 39.3mph This run was on the packs that I had already ran 3 laps on with the 42x55 prop, so maybe add 2mph more if they were fresh charged batteries. This prop got out of the hole very well with very little cavitation if any at all.

Batteries 2x Turnigy nano-tech A-SPEC 6600mah 2S 65~130C (these batteries always log one mph more than any batteries I use in this boat)
x442 s&b 43.1 mph

still waiting on my x642 prop to test.

[JJ1TRXSAton]

Very cool info MADRCER. What gps tracker did you use? My friends get different results using the dynamite speed tracker and the Garmin ones. MY MC likes running with the X642.

Just saw your vid and saw the Garmin gps unit.

[MADRCER]

Thanks! I used the Garmin Forerunner 101 on all these test. What speed are you getting out of the x642 and on what motor?

[JJ1TRXSAton]

Hit 49 twice with the X642. Using the Giant Power 2S 6500mah 65 - 130C lipos. It does like to blow over sometimes. So far no hull damage.

[MADRCER]

Nice! 1800kv or 2030kv?

[JJ1TRXSAton]

The 1800kv. Going to swap in a different motor my friend has just to try it out.

[MADRCER]

UPDATED Speed Test results

Finally had time to run the x642 prop so I wanted to update my previous post with the speeds, if anyone is still curious on the differences see below. I believe I could raise the strut just a tad and pick up another mph but I am happy with it the way it is for now. However, I may try a M445 soon to see how it stacks up with the others.

Done a few test with different props and the replacement 1800kv motor if anyone is curious on the speed differences between them on my set up. No strut adjustments were made only prop swaps and the test were all done on the same exact day (except for the x642 test) and water conditions (average with some mild chop). The boat still has more in it but I wanted to find out which prop I liked best and which one would be faster for me so I can fine tune the boat for maximum speed without blowing over.

Batteries 2x Zippy 2s 5000mah 45c
42x55 Grim 43.6mph (sharpened and balanced by me). This prop would probably get 44.5mph with the nano tech 6.6 batteries since they traditionally pull another mph than my others
Prather 220 s&b 39.3mph This run was on the packs that I had already ran 3 laps on with the 42x55 prop, so maybe add 2mph more if they were fresh charged batteries. This prop got out of the hole very well with very little cavitation if any at all.
x642 (DASBOATA) 44.3mph

Batteries 2x Turnigy nano-tech A-SPEC 6600mah 2S 65~130C (these batteries always log around one mph more than any batteries I use in this boat)
x442 s&b 43.1mph
x642 (DASBOATA) 45.4mph

[SD Eracer]

Looks good, I think you have a few more mph in there with your strut settings and battery location.

Adjust one item at a time (strut positive or battery farther back) and check the speeds after each adjustment.

I figure 47 - 48 mph with the 1800kv and X642 should be consistent once you get the settings dialed in.

I would avoid going over 50mph with that hull, it's easy to break a seam over that speed with a hard flip.

A couple of years ago my Genesis cat was doing about 70mph before I lost connection and it hit the embankment and flipped head over tail several times on the ground before knocking a guy off his lawn chair and finally settling on the grass. I had zero structural damage, just a broken rudder break bolt. This was because I reinforced the hull with a couple of layers of fiberglass cloth. Unfortunately, its impossible to reinforce the Lucas Oil hull without cutting it open. I know people who drilled holes and filled it with expanding foam from the outside, but it ended up messing up the balance of the boat.

Just keep it the fun sporting boat you have now.

[MADRCER]

Damn must of been a hell of a flip lol... I'm not going to try to cut the tub and reinforce it unless it breaks. I was mostly interested in the prop swaps to see which one could pull the most mph on the same set up.

[SD Eracer]

Yup, it sure was

It was loud, everyone that heard it knew it didn't sound well, kinda like a bad belly flop.

I think you will find the X642 the best all-around prop for that boat, even my Pursuit mono seems to like it better than the M445. What's interesting is the temps and lipo pull isn't noticeable more than the mild Grimracer or 445 props.

I forgot to mention that living in San Diego, we pretty much run in salt water, which does allow our boats to go slightly faster than compared to fresh water. So the times I mentioned, you may want to knock a mph or so off for fresh water.

[MADRCER]

Good info on the saltwater. I would have never thought that it would be faster than running in freshwater.

[SD Eracer]

Yup, the salinity increases buoyancy or something like that. It's not a huge difference.

Good info on the saltwater. I would have never thought that it would be faster than running in freshwater.

[martin]

Salt water is denser than fresh, you get more buoyancy & the prop slips less. I run on salt water most of the time & if I run my boat on fresh water with the same set up the boat looks slower but also sounds like its revving higher due to more prop slip.

[CraigP]

The hydro hull skips better on salt, spends more time in the air. We used different props between fresh and salt in GP and Unlimited. We took rake out of the prop on salt to diminish additional prop walk. Also, salt water cools much better! Had to make timing/fuel adjustments. Warmer fresh water is a concern for water cooled FE's...