New Proboat Impulse 31" Deep Vee

[Brushless55]

About 4mph faster than the pb 1800kv with the same m545 prop and 11 degrees hotter.

love those motors!

[de-pro]

Funny enough that Y connector run fine on my land vehicles. The solder is actually gets melted inside the EC5 connector. The connectors get very warm with the thicker awg wire but with the newer Y connector and thinner wires, the connector is cooler. I guess the thicker wire allows more current through.I still have some extra room on the esc since as I mentioned it runs under 110 on the cap. Run times may get effected and I hope my flightmax 30c batteries can handle it. If not, I have some Gen Ace 40c on order from Hobbypartz. I am currently getting 140 on the batteries and after advancing the timing the temp on the battery went down by 10 degrees.

Ouch! Don't feel bad I just had a bad solder on one of my esc wires for the very first time. I was glad it was something so simple though instead of something expensive. Are you going to run the 2030kv UL-1 motor? I've got that as my spec motor for mine. It's almost as fast as my big motor with the prop I'm using on it now, should run great!

[RIPFENCE]

guys i got my impulse up to 58 today with a catle 1520 on 6s1p crammed into the boat and an x645 prop..just so everyone is aware the hatch cannot take crashes above 45 mph...the gelcoat will chip off real easy..i am on my third hatch already..i am going to keep a brand new on hand for shelf queen purposes and reinforce my chipped hatches with carbon fiber..one other thing i have noticed when speed chasing is that the hull is super sensitive to the use of trim tabs..the boat wanted to fly until i started lowering the tabs..now its turning into a rocket in calm water with the tabs lowered...i have room to prop up and should be in the low sixties which is more the enough for this hull

[ron1950]

sounds like u got it going fast enough......now what are you going to do with it? race or sport etc?

[RIPFENCE]

just enjoy for sport running around...i never race or anything im just a dumb sportboater who overpowers everything..lol

[gcobra16]

It measures about 29.5" down the keel... 31" to the overhang.

The hull has a unique spray rail design that should help keep it from submarining most of the time, as well...

Initial speeds are typical of the power system... ProBoat took all their boats out and did some radar testing, using bone stock, out of the box boats with stock, un-prepped ProBoat props and here are the notes they sent me for this boat:

Impulse 31
Stock – 32mph on 4S-45C
Stock – 47mph on 6S-25C
Stock – 47mph on 6S-50C
1.9” Prop – 48mph on 6S-25C (Yes, we know you told us not to try this prop with this setup, and as you warned, we fried the ESC on this setup)

So, I'd expect about 40 or so with the right prop on 4S and obviously much faster with more cells. And WAY faster with more motor!

Darin: Stock - 47mph on 6S - 50C. Is that two 3S - 50C battery's?

[v-spec]

guys i got my impulse up to 58 today with a catle 1520 on 6s1p crammed into the boat and an x645 prop..just so everyone is aware the hatch cannot take crashes above 45 mph...the gelcoat will chip off real easy..i am on my third hatch already..

Mine busted going about 30mph. It's flexes right in front of the glued in flotation and cracks the paint off. Can you post some pics of your setup? What flex cable were you using?

[RIPFENCE]

i am using a hughey .187 flex cable..i just removed the teflon liner in the boat and iy works fine..i had to lift the motor up a hair to accomodate the bigger aeromarine collet..barely has enough clerence to spin but it does...i also had to trim the stuffing tube back a touch so the collet would fit

[gcobra16]

Thanks.

[v-spec]

i am using a hughey .187 flex cable..i just removed the teflon liner in the boat and iy works fine..i had to lift the motor up a hair to accomodate the bigger aeromarine collet..barely has enough clerence to spin but it does...i also had to trim the stuffing tube back a touch so the collet would fit

Ok cool, I'm using a .187 cable too but I used a setscrew collet because my octura was monstrous. Looks like you just got it to fit. Get some video up if you can.

001.jpg

[cvlex]

Our club fellow Sadatoshi took a short vid of the second run of my Impulse 31.
You may watch some bouncing or porpoising at the straight run on the vid, 00:49 to 1:31.
How to fix this ?

Any tips or advice are all welcome,

Thanks in advance,

cvlex

[v-spec]

Our club fellow Sadatoshi took a short vid of the second run of my Impulse 31.
You may watch some bouncing or porpoising at the straight run on the vid, 00:49 to 1:31.
How to fix this ?

Mine did that as well, I had to do a few things to get it to completely go away the first being moving the cg further forward with the lightweight battery packs. I also have the strut raised up 1/4 inch from the original location and added 1.5 degrees negative angle on the rear of the strut. I had to remove the upper strut bolt to do that but it's rock steady stable now. My cg is 8.75 inches from the rear of the transom not the transom overhang.

Tell your club buddy thanks for the video and you can also tell him the name of the band he put in your video is UVERworld I'd bet he'd be really surprised.

[cvlex]

Mine did that as well, I had to do a few things to get it to completely go away the first being moving the cg further forward with the lightweight battery packs. I also have the strut raised up 1/4 inch from the original location and added 1.5 degrees negative angle on the rear of the strut. I had to remove the upper strut bolt to do that but it's rock steady stable now. My cg is 8.75 inches from the rear of the transom not the transom overhang.

Hi v-spec,

Thank you so much for your kind help.

The CG of mine is 8.46 inches. I wish to run with further foward CG.

BTW, I am a bit confused about your strut setting. I think that if you raise the strut up, the transom is pressed down, the bow up and the boat might become unstable...

http://www.modelpowerboat.com/content.php?118-rc-boat-hull-attitude

Please pardon me if I am wrong.

Thanks again,

cvlex

[de-pro]

those 3.5mm connectors gotta go. I checked them today and noticed two of them were almost fused together. Used electrical tape for now.
Does anyone know an upgrade flex shaft for this boat without doing too much mod.

[de-pro]

So finally I got the UL-1 motor and replaced the stock with it. Also changed the motor/esc connectors to 5.5mm. The good news, she rocks and the cutting out problem went away. The bad news, I could not make the stock motor cooling jacket to work with the ul-1 motor. She was leaking like crazy. a friend came to rescue with the stock spartan cooling jacket. She fit perfectly and no leaks. The new motor did not put any more strain on the batteries or the esc. There is more room for the boat to go faster though. I like to try out a different prop.

[QUOTE=v-spec;345731]The bullets on the motor to esc are only 3.5mm maybe they are getting hot and desoldering. /QUOTE]