UL-1 Power system upgrade arrived!

[detox]

Make sure your prop is not bent on leading edges.

[LuckyDuc]

I wonder why it slowed the way it did? Did boat appear to be going slower after that 73mph fast start?

Yes, it did. My best guess as to the speed off the start.... Fully charged packs coupled with a "sling shot" effect from the cavitation then hook up.

Perhaps a more knowledgeable FE boater can explain. Kinda makes you wonder just how reliable the Max speed reading is on normal handheld GPS devices.

BTW. The prop looks fine. Still sharp with no dents/bends/folds/etc.

[Brushless55]

Well… I think that I found the right setup for the Medusa and the Grim L40x57. The 73.53mph number is legit as the gps had 8 satellites fixed when it got that reading, but it only did it right off the start. The boat cavitated for the first 10yds, and when it finally hooked up it took off like a rocket. Thus, yielding the 73.53mph reading. After that it settled to a 55-52mph top end each lap. The boat was planted with this setup too. I lowered the strut further than with previous test runs (15/16 inch.) It cavitates a bit off the start, but once it hooks up, it is planted. I also angled the turn fin up a bit too. Color me HAPPY. I like this little Medusa motor and the Grim L40x57 prop.

Awesome job LuckyDuc!
makes me want a different motor for my UL-1

[Capt. Crash]

Wow...way to go Lucky!

The 40X57 is my favorite prop since I started playing with it last Dec/Jan.

My GPS readings are very consistant down to the 1/10 mph. I feel like I'm getting good readings.

I have my boat ready to rumble again. After a rain out this weekend I am getting antzy. I took my 40X52/3 and did about a 75% de-tounge job on it. I'm curious to see if I can get a few more MPH out of it and cooler temps at the same time. If I can get 46-47mph... I will be happy with it.

Crash

[Drag Boat Bob]

Well… I think that I found the right setup for the Medusa and the Grim L40x57. The 73.53mph number is legit as the gps had 8 satellites fixed when it got that reading, but it only did it right off the start. The boat cavitated for the first 10yds, and when it finally hooked up it took off like a rocket. Thus, yielding the 73.53mph reading. After that it settled to a 55-52mph top end each lap. The boat was planted with this setup too. I lowered the strut further than with previous test runs (15/16 inch.) It cavitates a bit off the start, but once it hooks up, it is planted. I also angled the turn fin up a bit too. Color me HAPPY. I like this little Medusa motor and the Grim L40x57 prop.

Congratulations Duc!

The rpm must have been off the scale in order for it to hook up like that. A 35+% increase in speed is truly amazing.

Good job keeping it on the water and not becoming one of your other jets.

Did you use an air dam?

[LuckyDuc]

Thanks guys!

No air dam for that run. Perhaps when I re-visit the larger more aggressive props.

I wonder... could I reproduce a consecutive run if I let the boat off plane and cavitate again. How do the SAW guys do it?

[Capt. Crash]

I don't think they have the turn fin on...take that puppy off and try it....but you will need a wide turn around area.

[Drag Boat Bob]

I don't think they have the turn fin on...take that puppy off and try it....but you will need a wide turn around area.

I'll second that!

And I'll even file the flight plan for you...

[jingalls007]

I was suggested to try the X642 with the stock setup as a Heat prop. This coming from an experienced FE racer on this site who knows his stuff. You might even think about trying an X637 to start with but don't go over your 3 minute run times, things may heat up a little too much. I love the 6series prop's for speed and handling, maybe give it a shot.

[Brushless55]

What prop is your favorite so far jingalls007 ?

[LuckyDuc]

I was suggested to try the X642 with the stock setup as a Heat prop. This coming from an experienced FE racer on this site who knows his stuff. You might even think about trying an X637 to start with but don't go over your 3 minute run times, things may heat up a little too much. I love the 6series prop's for speed and handling, maybe give it a shot.

Thanks. I will try the x642 after the Grim L40x52.

[jingalls007]

What prop is your favorite so far jingalls007 ?

the 38X55 for my UL-1. I just finished my Sprint Cat build and am testing different props with that today, last night was my first run with an m440. Im about to head out with my X642 and will also try that on my UL-1. I see your also building a MM, nice work.

[jingalls007]

Thanks. I will try the x642 after the Grim L40x52.

im going to try the X642 on the UL-1 today, ill let you know how she goes.

[Brushless55]

the 38X55 for my UL-1. I just finished my Sprint Cat build and am testing different props with that today, last night was my first run with an m440. Im about to head out with my X642 and will also try that on my UL-1. I see your also building a MM, nice work.

Yes I am letting some stuff dry out before I head out to the lake with my MM.

Let us know how you like the x642, I might need to pickup a 38x55 for my UL-1

[bigpapa]

got one to try also on the UL-1