Killer Kat (Build Pics Updated)

isuzudude replied the topic: Re: Killer Kat (Tech question added????)

It's actually wide enough to spead the motors out so I wouldn't have to wrap them outwards to get into the bottom of the sponson. But for ease, I think I'm going to stay in between the sponsons like you just said. But for straight out speed...should I submerge the props. Sorry to keep buggin ya Scott!!! :dry: But I know you have experience with making a boat go fast!!!(Compliment) ;)
#13786

Please Log in or Create an account to join the conversation.

isuzudude replied the topic: Re: Killer Kat (Tech question added????)

Gotta few more pics...
#13787
Attachments:

Please Log in or Create an account to join the conversation.

isuzudude replied the topic: Re: Killer Kat (Tech question added????)

another
#13788
Attachments:

Please Log in or Create an account to join the conversation.

isuzudude replied the topic: Re: Killer Kat (Tech question added????)

Getting really close!!!! B) B) B)
#13789
Attachments:

Please Log in or Create an account to join the conversation.

isuzudude replied the topic: Re: Killer Kat (Tech question added????)

Let's try these~~ B)
#13790
Attachments:

Please Log in or Create an account to join the conversation.

isuzudude replied the topic: Re: Killer Kat (Tech question added????)

Last 2 for now....
#13791
Attachments:

Please Log in or Create an account to join the conversation.

isuzudude replied the topic: Re: Killer Kat (Tech question added????)

Hey Woodie... Does that last pic look like your looking down into the belly of the Beast? Just don't go gettin' scared on me :woohoo: :woohoo:
#13792

Please Log in or Create an account to join the conversation.

Scott replied the topic: Re: Killer Kat (Tech question added????)

Go FAST will still dictate Surface Drive using BIGGER and HIGHER PITCH props than you could if props were run submerged

2 stroke Engine Tech of 30+ years, Prop tweeker, Chronic tinkerholic, Home of Motor Heads RC Racing Engines ...
8 time NAMBA National 6 lap heat racing record holder.
#13794

Please Log in or Create an account to join the conversation.

Woodie replied the topic: Re: Killer Kat (Tech question added????)

Hi Isuzu.

Thanks for the great pics. I just love good woodwork, and yours look really fine!
(I see that I have to get myself together to follow you in the build). :dry:
Scared? No, no! I never tell when I'm scared. :laugh:

Scott: About the surface props, you must be the expert. I just don't understand how a prop, that in my opinion wastes power by spraying "tons" of water into a rooster tail, could be more efficient than a submerged prop, that sends all of the power into the water.

Cheers! :cheer:

Woodie.
#13796

Please Log in or Create an account to join the conversation.

Scott replied the topic: Re: Killer Kat (Tech question added????)

Water you see in the air behind boat will vary greatly pending on profile blades have and degree of slip that is happening.
Think of it this way .... more blades you have UNDER WATER with each doing the same amount of work make the prop generally quite efficient, but the ablity to move MORE water FASTER is limited to the horse power and rpm you have .. :huh: savvy

Go to surface drive where load engine gets is only one blade at a time or tad more with 3/4 blades, the size and pitch of the prop can increase much more under the same horse power and rpm. Move more water faster you go faster so long as boats free's up from water drag and prop choice is correct for application.
Understand NOT all profiles and types of props will work in surface drive applications and those that will do an outstanding job of hooking up quite well.

You need to also understand some applications full size or model NEED prop to stay in the water hooked up so engine rpm is kept in check. Drag boats and Turbines are prime examples where you absolutely cannot afford to get run away rpm spikes from a hop while running WOT.

This just a snippet of the knowledge in prop tech, do some GOOGLE search's about Surface Piercing Propulsion, you can read for weeks :woohoo:

Actually here is a good one: rds.yahoo.com/_ylt=A0oGdWde2OB....ca/surface.htm

2 stroke Engine Tech of 30+ years, Prop tweeker, Chronic tinkerholic, Home of Motor Heads RC Racing Engines ...
8 time NAMBA National 6 lap heat racing record holder.
#13809

Please Log in or Create an account to join the conversation.

Time to create page: 0.111 seconds

User Login

Mailbox

You are not logged in.

© 2017 Modelgasboats.com. All Rights Reserved.