50 MPH with the 40X57/3

[Capt. Crash]

Well I got mine in the water this weekend and the conditions were perfect for hydros....just a little ripple on the otherwise smooth water.

I did 3 runs with 3 sets of packs....all runs were with the same set up.

Stock motor & ESC (basically bone stock setup except upgraded flex shaft and thrust bearing added)

Grim Racer 40X57/3 prop @ 1" strut depth

MaxAmp 5250 30c 2s packs

Stock turn fin.

Ambient temp was low-mid 80's. Boat temps were a little up but not bad until the last run when I almost doubled the run to a 1.8 mile total before coming in.

Motor 125 degrees
Motor connectors 110 degrees
ESC 112 degrees (forgot to check cap)
Batteries 140 degrees
Deans Connectors 178 degrees

This is the warmest I've gotten the components, and I'm not comfortable with these temps. I will be replacing the Deans connectors with 5.5mm bullet connectors, but after seeing how cool the motor connectors are...I'm leaving those alone. I'm not too happy about battery temps. Maybe the 40X57/3 prop is too much for a longer run in the summer setting. I may remove it until things cool down this fall and play with some less aggressive props. I did hit 50mph again, with all the runs in the 49-50mph range.

Repairs held up nicely but I had about an ounce of water in the hull. I think it's leaking around the stuffing tube again.

I had very noticeable turning problems on my first run so I brought her in to check the rudder. I almost lost my turn fin, it was flopping around because the nylon breakaway bolt fell off and the 440 bolt was half way off....this is about the 3rd one of these nylon bolts I've lost on the fin or rudder. Although I locktite them with the Blue stuff...they seem to find a way to come loose. I will go back to the nylon zip ties.

I thinking about cutting the front open and repairing the leading edge next.

Crash

[longballlumber]

For the Nylon fasteners and loctite... I don't think loctite will work on plastic, only on metallics...

Try using a very small dab of silicone or Shoe Goo on the nylon stuff to keep it from backing off.

[jingalls007]

Also it's never a bad idea to upgrade to a larger diameter silicone tubing for cooling. I did it on my UL-1 and I don't have any issues with heat and I run 10 minutes at a time.

[detox]

My allen screws in rudder came loose and I lost one. Be sure to tighten those well and use Blue Loctite.

BTW your temps look OK to me. Those temps you are seeing now will rise higher in the Hot summer months.


...

[Brushless55]

50mph! great job

[nate]

Can you get a video next time Crash?...

[bedrock]

Im a new ul-1 user running stock ESP and Grimracer 40-57/3 prop with 7.4 3600 20C batt's

Can I use other larger capacity battries - say 4900mah 25C or higher - will this increase speed?

will the ESC take the extra current?
________
Vapormatic vaporizer

[Brushless55]

Im a new ul-1 user running stock ESP and Grimracer 40-57/3 prop with 7.4 3600 20C batt's

Can I use other larger capacity battries - say 4900mah 25C or higher - will this increase speed?

will the ESC take the extra current?

Yes!
I use 5200mah 30c packs and they work great..
these boats like lots of amps from the packs

[Capt. Crash]

Im a new ul-1 user running stock ESP and Grimracer 40-57/3 prop with 7.4 3600 20C batt's

Can I use other larger capacity battries - say 4900mah 25C or higher - will this increase speed?

will the ESC take the extra current?

Most definitely YES! Go with the bigger amps and C rating. Your boat will be faster and the batteries will run cooler because they don't have to work as hard.

[donthavta]

upgraded flex shaft?

Well I got mine in the water this weekend and the conditions were perfect for hydros....just a little ripple on the otherwise smooth water.

I did 3 runs with 3 sets of packs....all runs were with the same set up.

Stock motor & ESC (basically bone stock setup except upgraded flex shaft and thrust bearing added)

Grim Racer 40X57/3 prop @ 1" strut depth

MaxAmp 5250 30c 2s packs

Stock turn fin.

Ambient temp was low-mid 80's. Boat temps were a little up but not bad until the last run when I almost doubled the run to a 1.8 mile total before coming in.

Motor 125 degrees
Motor connectors 110 degrees
ESC 112 degrees (forgot to check cap)
Batteries 140 degrees
Deans Connectors 178 degrees

This is the warmest I've gotten the components, and I'm not comfortable with these temps. I will be replacing the Deans connectors with 5.5mm bullet connectors, but after seeing how cool the motor connectors are...I'm leaving those alone. I'm not too happy about battery temps. Maybe the 40X57/3 prop is too much for a longer run in the summer setting. I may remove it until things cool down this fall and play with some less aggressive props. I did hit 50mph again, with all the runs in the 49-50mph range.

Repairs held up nicely but I had about an ounce of water in the hull. I think it's leaking around the stuffing tube again.

I had very noticeable turning problems on my first run so I brought her in to check the rudder. I almost lost my turn fin, it was flopping around because the nylon breakaway bolt fell off and the 440 bolt was half way off....this is about the 3rd one of these nylon bolts I've lost on the fin or rudder. Although I locktite them with the Blue stuff...they seem to find a way to come loose. I will go back to the nylon zip ties.

I thinking about cutting the front open and repairing the leading edge next.

Crash

upgraded flex shaft were do you get it and what is the difference from stock?

[sailr]

Steve at OSE sells them.

Product ID: ose-cable-ul1
OSE Upgraded AquaCraft UL-1 Cable
In Stock: 0 Details


OSE Flex Cable Assembly for the AquaCraft UL-1. Upgraded .150" Cable with 3/16" prop shaft. This is cut and ready to install in your boat. This upgraded cable is a higher quality with thicker wire strands and better aligned to the prop shaft then the stock unit. The prop shaft is only 2 1/4" long which reduces resistance and allows more strut adjustment. Which will help vibrations which will help reduce strut bearing wear. Just install it and go!

No soldering or cutting required!

This can also be used in any other boat requiring a .150 cable that measures 13 11/16" from tip to tip.

Price: $24.99


Unfortunately they are currently out of stock.

upgraded flex shaft were do you get it and what is the difference from stock?

[bedrock]

hey all

Took my Ul-1 out today it ripped - except I have cracked the area around the turn fin can wedge apart - can I repair this with some Arildite or simular? Or does this need re-glassing - the bolt holes are still ok not striped......

Looks like this model was a late one re-inforced in this area - I ran up a imbankment

thanks in advance

Bedrock
________
Free Xxx

[Brushless55]

hey all

Took my Ul-1 out today it ripped - except I have cracked the area around the turn fin can wedge apart - can I repair this with some Arildite or simular? Or does this need re-glassing - the bolt holes are still ok not striped......

Looks like this model was a late one re-inforced in this area - I ran up a imbankment

thanks in advance

Bedrock

Sooo, you ran the boat ashore and cracked it around the turn fin?

[bedrock]

Yep

Got some glass today and will cover the fin area then put another Alluminum bracket covering the whole area then screw original one to this.

This boat was purchased only 2 weeks ago think it would be the later batch that has been made stronger......
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Mercedes-benz t2 history

[Shooter]

Capt - 50mph is commendable with that set-up!! The most I've ever gotten was 44mph (100% stock with an X440/3), but the water was a little rough. I might pick-up a grim 40x57 prop this week. Last time I checked one out, the shape seemed different than my 440/3. They are darn close in diam and pitch though...