Sprintcat Pictures

[knpc]

These are some pictures of my Sprintcat running. I can't get the camera to take a clear picture. I'll play with the camera settings to see if it helps, maybe its just not a good enough camera to pick up the boat going by at 50mph.

The pictures are at a house that I'm working on in N.H. Its 2hrs from my house so I've been sleeping there during the week. After work I walk off the deck down to the water, drop the boats in and go. :thumbup:

[Raydee]

What is your setup again?

[Rumdog]

Gotta love the sprintcat!! I completely tore mine down to a bare, sanded hull. Gonna try something much different than the old setup. Lookin' good man!

[knpc]

Right now it is 1521/1.5d, cc lv240, 4s2p, x450. I am changing it this weekend though. I have a 1527/1y, cc hv240, 6s2p on my workbench ready to go in it. The motor/esc that are in it now are going into my df33. Can't wait to get the new stuff in both boats, should be good setups I hope.

[Raydee]

Yep that is the setup I have going in mine IF I ever get off my lazy butt and build the boat.

[D&D]

Always loved Sprint Cats above all other boats. Would love to see a picture of the setup in/on the boat. Nice looking cat.

[Heath M]

nice pics and what a great place to work.
Don't supose you need a fellow carpenter/ boater to help do you :Praying:

[knpc]

nice pics and what a great place to work.
Don't supose you need a fellow carpenter/ boater to help do you :Praying:

It is a great place to work. This was a short job, but I built the house next to this one 3 yrs ago and was there for 10 months. I bought my first FE boat when I started the house and have been hooked ever since.

I got the 1527/1y and HV240 in and bench tested, The esc didn't go up in smoke on plug in so that's a good start. It's been raining here all weekend so the test run will have to wait til next weekend. I have a x450 on it to start with and also have a x452, x455 to test if all goes well.

[Rumdog]

It is going to fly! Hope you're ready to see mid sixties with that 455! I got around 56 mph with the 452 as well.

[Rumdog]

Yo, you run that new setup yet?

[knpc]

Not yet, but it should be tomorrow morning if the wind and weather are okay. My wife and I are actually away for a few days. The best part is the house we're staying at is lakefront!!! I brought three boats to play with while she goes shopping.

I'll post the results as soon as I run it.

[Brushless55]

Where did you get that sweet looking cowl for your Sprintcat?

[knpc]

Where did you get that sweet looking cowl for your Sprintcat?

I made it by cutting up the stock "classic" hatch. Here are some pics of the proccess.

[knpc]

I took it out for the first time with the 1527/1y. I didn't get the performance I was hoping for. I'll have to check the transmitter and esc settings to make sure everything is correct.

It was in the low 40s with a x450. After the 3 min run - lipos, esc, and motor were all in the mid 80 deg range.

I'll check everything and put on a x452 and make another run later.

Any thoughts on what the problem could be?

[Rumdog]

Where is the strut depth at? Def go with a bigger prop. Set the timing at at least 15 degrees. Male sure the lvc is properly set. A x455 if you have one will make it fly!! You need to load the motor to get the performance you want out of it. I tried a x648 and had very poor speed. Put the strut at .5" above the sponson bottoms at neutral angle.

[Brushless55]

I made it by cutting up the stock "classic" hatch. Here are some pics of the proccess.

Awesome job man!
I love to see custom work :thumbup1:

[knpc]

I made another run this morning with an x452. Speed was around 50mph and temps were good. I hooked up eagle tree this time to get some data. The rpm was around 19k-20k in the straights. Is that about right for the rpm? unloaded rpm would be 28k. Here's a graph of amps.

[Raydee]

Is that prop stock, just balanced and sharpened?

[knpc]

Yes, just B+S, no mods

[Raydee]

How much run time are you getting with the 452 prop and what cells are you using? I imagine a X455 detongued and backcut would give you 5 mph more and would still run fairly cool. I know I have seen guys running a X455/3 prop with the 1Y motor on 6s so I think you still have some room to prop up. I noticed that Neu motors like to be "Loaded" for them to work at their best.

[knpc]

I have two sets of packs for it.
2-Thunderpower 6s 25c 5000
2-PolyRc 6s 30c 5000

The last run was 4 1/2 min and I only put 2500mah back into each pack.

I have a x455 to try, I just wanted to start with the x450 and work my way up.
Does the amps I'm pulling seem about right? 70avg with highs in the 120-140 range.

[Fluid]

The amps and rpm are low for best performance with the Neus. I'm not certain why the rpm is low - without the datalog I'd say you were lugging the motor, but 70 amps is barely enough to warm it up. What timing are you using? The "Y" Neus like plenty of advance.


.

[Raydee]

Yep my Y winds like race timing, they seem to run cooler and faster with some advance.

[Brushless55]

Yep my Y winds like race timing, they seem to run cooler and faster with some advance.

how much timing do you think is good or best for the NEU?

[Raydee]

I am sure every setup is going to run different. Any time I build a hull I run the lowest timing for a minute and check temps. Make timing changes and try it again until I find the setup that works good for me. On my Whiplash hull I run a 1515 1Y and could not get it to perform until I switched to a large prop and upped the timing to RACE from low...can't remember what the actual timing numbers are but I think it is at 14 or 15. When I ran it on low the motor and esc ran hotter and the boat was slower. I tinkered with this hull for almost a whole season before I finally figured it out. On my D wind Neu's I never tried to up the timing for Low and they seem to fly.