Pro Boat Formula Fastech Jet Drive Project

[crazzy maxx]

what size brishlees are you thinking on putting in?

[Diegoboy]

This one WILL definitely be Brushless! I'm not sure the speed, as I have never used this size drive before.

[calcagno45]

Can you use brushless motors with these jets drives as well? And what types of speeds do these push?

[Diegoboy]

Got more time with it this morning, and Viking is absolutely right. My hole is too far fwd. not to mention the transom isn't 90° to the bottom of the boat. This one is fighting me every step of the way, but a brainstorming session with myself this morning may have a way to beat it! It's gonna be awesome!

[Diegoboy]

No. Heck no! I am on standby (on call) this weekend. I plugged the HW mounting holes in the transom, but haven't had time to take, or upload a pic yet.

[crazzy maxx]

diego are u backing out of what seemz to be ur 30th jetboat build?

[Viking]

Link

J.M.
too late to edit that post. Here is the link again to the Challanger Video

http://www.youtube.com/watch?v=faWJTGbdM9Q

with the h
Thanks;
Viking

[rockwerks]

I think he means scale racing emulating full size river jet boat racing like this...

http://www.vidilife.com/video_play_1...River_Race.htmGhost

That would be it...........up one side of the creek, back down the center and up the opposite bank timed through gates

[j.m.]

put an "H" in front of the bottom link.

[Viking]

Water rock crawling

I like it "Water Rock Crawling" here is the Electro Vee

http://www.youtube.com/watch?v=sLurjY0OYkQ

and here is the Challanger twin jet. both are brushed motor driven.
ttp://www.youtube.com/watch?v=faWJTGbdM9Q
I don't know where the echo came from on the vid !?
Viking

[ghostofpf1]

Do you mean water rock crawling? lol

I think he means scale racing emulating full size river jet boat racing like this...

http://www.vidilife.com/video_play_1...River_Race.htm

Ghost

[Diegoboy]

Viking,
I got it covered. Worry not my friend!

[Viking]

Jets

Diegoboy;
Man I think you are in trouble.
Your ruler clearly shows the hole is 4 1/8" from the transom, that is the exact way I measured my boat and it measured 3 5/8"
The part of the jet that the impeller is in ( the jet chamber) has a flange that the nozzle is bolted to and that flange should be on the out side of the hull. that way you can seal the jet chamber to the hull, and get the nozzle off for maintenance.
Weeds and sticks get in there and around here acorns. The photo below clearly shows this. The chamber is inserted through the transom and into the intake duct. I sealed mine with 3M "5200" sealant.
Not a big deal you can fix anything in fiberglass.
Consider this the further back the intake is the more it stays in the water. there is no thrust when the jet is sucking air.
I have had the idea of an aluminum jet boat rattling around in my skull for a couple of years. My Electro Vee jet was great the ABS vacuum formed hull would give when it hit rocks in the stream. My Challanger twin jet Fiberglass hull is taking a beating. So much so I may pull the jets and do twin screws, counter rotating of course.
Sorry to be the bearer of bad tidings;
Viking

[Diegoboy]

Viking,
Thanks for the concern, Does this picture help? I measured your oic and used a known object to Gage the distance.( steering pivot point to transom) and it seems the same distance to me...

[Viking]

Jets

Diegoboy;
I have a depth perception problem too, but I only see with one eye, which makes it really difficult. I seem to be having that problem with your boat. That hole looks to be too far from the transom. I have that same jet in an Electro Vee 29" and my intake starts 3 5/8" from the transom. Yours appears to me to be further than that. I'll add some photos. I ran a V drive with the motor over the shaft, you can see the motor mount in one of the photos, no motor in there. That kept the CG (center of gravity) in proportion. I don't see how you are going to mount a motor in front of that shaft and balance the boat. Unless you shorten the shaft a bunch. That is a 40mm impeller in that jet and it takes some HP to spin it. No short motors need apply.
The yellow tubing from the jet into the hull works great for cooling the motor and ESC.
Good Luck;
Viking