Speed - RC Nitro Boats For all your rc nitro fuel burning boating needs.

GrimRacer Surface Drive Strut & Rudder

Reply

Old 11-23-2007, 01:54 PM
  #1  
jetpack
Thread Starter
My Feedback: (1)
 
jetpack's Avatar
 
Join Date: Oct 2002
Location: Hobart, IN
Posts: 2,477
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default GrimRacer Surface Drive Strut & Rudder

I'm planning my project and looking at GrimRacer's strut and rudder that is used on the 27" Nitro SuperVee (.18 power).

I am also new to monohulls, both building and running. Would someone be able to tell me if this would be a good answer to what should be put on my boat?

The reason I ask is what performance I can expect. First of all the boat is an older, all wood design called a "Norco R/C Eaglet" and will be powered by a strong .21 engine. It is a shallow V design and planning on adding a right side turn fin and a removable Octura brass center skeg to help in the corners. If you look at the build pics, the bottom of the boat is just a large running pad, built like a ski, with the sides of the bottom being stepped up for less drag. I would guess the total vee angle is only about 7 degrees per side.

The transom area is quite small on this, and brackets will be crowded. Original plans call for a standard transom mounted sub-surface drive setup. Is a surface drive even a good idea for this boat?

Grim's hardware is quite nice looking being CNC machined and anodized, and is a reasonable cost and good availability compared to the others that are more expensive, race orientated Speedmaster or the like. I would also like to learn some of it's sizes such as flex and stub shaft size and threads. I use standard 1/8" bore Octura and Prather props. Sizes to start with would be great too!

I am hoping people will point out if it is a good idea or not before I go out, buy and build before I fiind out it was all the wrong idea. A non-stinger type setup option would be the strudder assembly from Octura which can be setup as a surface drive, but it is expensive and all heavy copper, and would have to move the strut to the rudder position on the bracket to be able to clear the nose of the strut, and still have to go with a seperate rudder and bracket.

Credit for the build pictures goes to Oldlugs who provided me help with templates and instructions. He provided me with an excellent project and greatly appreciate it....
Attached Thumbnails Click image for larger version

Name:	Ki19652.jpg
Views:	18
Size:	31.7 KB
ID:	810010   Click image for larger version

Name:	Oj28408.jpg
Views:	20
Size:	69.7 KB
ID:	810011   Click image for larger version

Name:	Gl18898.jpg
Views:	18
Size:	59.2 KB
ID:	810012   Click image for larger version

Name:	Wp41406.jpg
Views:	21
Size:	116.1 KB
ID:	810013   Click image for larger version

Name:	Qb36772.jpg
Views:	20
Size:	33.9 KB
ID:	810014   Click image for larger version

Name:	Lc47603.jpg
Views:	18
Size:	10.2 KB
ID:	810015   Click image for larger version

Name:	Sq45937.jpg
Views:	16
Size:	105.4 KB
ID:	810016  
jetpack is offline  
Reply With Quote
Old 11-23-2007, 02:10 PM
  #2  
Ron Olson
My Feedback: (1)
 
Ron Olson's Avatar
 
Join Date: May 2002
Location: Kalamazoo, MI
Posts: 18,566
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GrimRacer Surface Drive Strut & Rudder

The fotprint on the transom isn't going to be much smaller than the Speedmaster's but he price is a lot lower. Offshore Electrics sells the Grimracer unit as well as Tower or your LHS should be able to get it also. you'll have to go iwth an alternate method of running a cooling line ot the engine though.
Ron Olson is offline  
Reply With Quote
Old 11-23-2007, 02:13 PM
  #3  
Ron Olson
My Feedback: (1)
 
Ron Olson's Avatar
 
Join Date: May 2002
Location: Kalamazoo, MI
Posts: 18,566
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GrimRacer Surface Drive Strut & Rudder

Comparison shot:
Ron Olson is offline  
Reply With Quote
Old 11-23-2007, 03:54 PM
  #4  
piper_chuck
My Feedback: (12)
 
piper_chuck's Avatar
 
Join Date: Jun 2004
Location: Columbia, SC
Posts: 8,039
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GrimRacer Surface Drive Strut & Rudder


ORIGINAL: Ron Olson

Comparison shot:
Was that shot before or after you ran them through the washer for their cleaning?
piper_chuck is offline  
Reply With Quote
Old 11-23-2007, 11:16 PM
  #5  
Ron Olson
My Feedback: (1)
 
Ron Olson's Avatar
 
Join Date: May 2002
Location: Kalamazoo, MI
Posts: 18,566
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GrimRacer Surface Drive Strut & Rudder

Hey, sometimes you gotta run them were you can!
the first boat has a modded Warehouse Hobbies SPD-E drive on it, the second the Speedmaster stinger with a shortened (too far and has been replaced) rudder and of course the Super-Vee 27.
Ron Olson is offline  
Reply With Quote
Old 11-24-2007, 08:41 AM
  #6  
jetpack
Thread Starter
My Feedback: (1)
 
jetpack's Avatar
 
Join Date: Oct 2002
Location: Hobart, IN
Posts: 2,477
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GrimRacer Surface Drive Strut & Rudder

Thanks Ron!

About the Grim rudder - can the L bracket be flipped to point either way inward or outward on it? Is the location of the rudder off centerline important? It looks like the Grim outdrive will work great, but I am afraid the rudder couldn't be moved over far enough for the bracket to catch the mounting area. Looks like it would interfere with the prop diameter eventually the closer it's moved towards center.

What is getting me on all this is that transom if you look on the box picture isn't any bigger than the radio box just ahead of it. The sides think out quick!
jetpack is offline  
Reply With Quote
Old 11-24-2007, 09:21 AM
  #7  
Ron Olson
My Feedback: (1)
 
Ron Olson's Avatar
 
Join Date: May 2002
Location: Kalamazoo, MI
Posts: 18,566
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GrimRacer Surface Drive Strut & Rudder

I just went downstairs twice to check mine. Yes, the rudder bracket can be flipped as well as the rudder steering arm.
I've been running into that problem also on my .12 monos. Lots of fun getting (what seems like) my fat fingers into tight places when putting in nuts holding the transom hardware on. Good thing for needle-nose Vice-Grips!
You're going to want enough offset of the rudder so that the prop doesn't hit it when making hard left turns.
Ron Olson is offline  
Reply With Quote
Old 11-24-2007, 09:47 AM
  #8  
jetpack
Thread Starter
My Feedback: (1)
 
jetpack's Avatar
 
Join Date: Oct 2002
Location: Hobart, IN
Posts: 2,477
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GrimRacer Surface Drive Strut & Rudder

Cool, thanks! Now if I can just find the bracket. I went to Tower and all they carry is the rudder blade and the control arm - no hinge pin or anything. They have all the strut parts and so does OSE. I might bite the bullet and go with an aluminum Octura rudder and the short bracket, that way I can tuck it in closer to the transom and off away from the prop area. Might mess up the water path ahead of the prop though... still figuring. Would be nice to stay with all Grim just for the blue package.
Attached Thumbnails Click image for larger version

Name:	Yw67010.jpg
Views:	21
Size:	43.2 KB
ID:	810564  
jetpack is offline  
Reply With Quote
Old 11-27-2018, 07:05 AM
  #9  
denny60
 
Join Date: Dec 2014
Posts: 1
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Hello I've been looking for an old Northwind but I'm not sure if they did timber kits .So I was wondering if the templates are available for one of the above boats .I can draw my own plans but I know this has already been sorted even though it is an old design . Thanks Dennis James
denny60 is offline  
Reply With Quote
Old 11-27-2018, 09:42 AM
  #10  
Ron Olson
My Feedback: (1)
 
Ron Olson's Avatar
 
Join Date: May 2002
Location: Kalamazoo, MI
Posts: 18,566
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Originally Posted by jetpack View Post
Cool, thanks! Now if I can just find the bracket. I went to Tower and all they carry is the rudder blade and the control arm - no hinge pin or anything. They have all the strut parts and so does OSE. I might bite the bullet and go with an aluminum Octura rudder and the short bracket, that way I can tuck it in closer to the transom and off away from the prop area. Might mess up the water path ahead of the prop though... still figuring. Would be nice to stay with all Grim just for the blue package.
OK Dave, I know it's an old thread but contact Gary Preusse, he's not too far from you in a Chicago suburb. No Internet but call him at 630-279-2451 as he's an Octura dealer plus he drives over to Skokie to pick up his orders.
Ron Olson is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service