Project of the Month built by Stefan-K
Home Model Engine Machinist > Building Them > Plans > High Speed Steam Engine

Reply
 
Thread Tools Display Modes
Old 07-30-2014, 04:21 PM   #31
windy
 
windy's Avatar
 
Join Date: Feb 2010
Posts: 91
Liked 33 Times on 21 Posts
Likes Given: 24

Default

After July runs now getting ready for Sundays blast have made some new rear wings of a better aerodynamic profile to keep the stern down at speed?
Might do some more alterations to prop angle but after 122.5 mph with half a wing off will see after first attempt.
Found a bit of minute black metal debris on the water pump bottom feed it looks as if it came from the steam generator possibly when releasing pressure as I am very strict about pump and tank cleanliness.
That was the problem with the pump at times when starting.
The 2014 EN24T cylinder head (one piece apart from cast iron valve guide) has proved itself after last years leaking head.


windy is offline  
 
Reply With Quote
Old 07-30-2014, 10:30 PM   #32
lohring
 
Join Date: Aug 2011
Posts: 177
Liked 67 Times on 54 Posts
Likes Given: 10

Default

Very nice looking head. I'm getting ready to machine a cylinder and head and was wondering what hardness it could be tempered to. From the colors on your head it looks like the maximum temperature might be below 800 degrees F which would allow a 45 Rockwell C hardness. My stock is already heat treated to 35 Rockwell C. What hardness are you running on your head and cylinders? Are you still using a cut down automotive exhaust valve for your valve?

Good luck on your run.

Lohring Miller


lohring is offline  
 
Reply With Quote
Old 07-30-2014, 11:34 PM   #33
windy
 
windy's Avatar
 
Join Date: Feb 2010
Posts: 91
Liked 33 Times on 21 Posts
Likes Given: 24

Default

Quote:
Originally Posted by lohring View Post
Very nice looking head. I'm getting ready to machine a cylinder and head and was wondering what hardness it could be tempered to. From the colors on your head it looks like the maximum temperature might be below 800 degrees F which would allow a 45 Rockwell C hardness. My stock is already heat treated to 35 Rockwell C. What hardness are you running on your head and cylinders? Are you still using a cut down automotive exhaust valve for your valve?

Good luck on your run.

Lohring Miller
Material is en24t no other heat treatment
In the past it has gone over the colour temperature range depending on pump settings etc. this head has hardly been run yet expect it all to change colour soon.
Valve has to be one piece (no welded head) and at least 21/4n material or better.

Paul
windy is offline  
 
Reply With Quote
Old 07-31-2014, 12:24 PM   #34
waynes world
 
Join Date: Nov 2009
Posts: 55
Liked 3 Times on 3 Posts

Default

Very interested in the propellers could you tell about them, are they hand made or readily available to buy, where from etc , I know about the web site on the wire but no real info on technical side.
waynes world is offline  
 
Reply With Quote
Old 07-31-2014, 12:47 PM   #35
lohring
 
Join Date: Aug 2011
Posts: 177
Liked 67 Times on 54 Posts
Likes Given: 10

Default

http://www.prop-shop.co.uk/index.php...ction=products
Click on more info to find what the numbers mean. For a general understanding of propeller operation you can read my articles on propellers in the NAMBA Propwash; propeller theory in part 1 and propeller geometry, measurement, and manufacturing in part 2. Part 3 will cover what is done to convert a casting into a high performance racing propeller.

Lohring Miller

PS Paul, thanks for the material information.
lohring is offline  
 
Reply With Quote
Old 07-31-2014, 08:47 PM   #36
windy
 
windy's Avatar
 
Join Date: Feb 2010
Posts: 91
Liked 33 Times on 21 Posts
Likes Given: 24

Default Hand made prop

Quote:
Originally Posted by waynes world View Post
Very interested in the propellers could you tell about them, are they hand made or readily available to buy, where from etc , I know about the web site on the wire but no real info on technical side.
Some tethered hydroplane competitors buy the cast props and tweak them but have seen them bend.
Many of the high performance competitors make their own out of steels like EN24T.
Mine is 4 inches in diameter out of HT steel I start by milling the root angle then twist the blade with something on the lines of a large tap wrench to the angle I require.
A template of the blade shape is then scribed on the rough blade.
With a series of angle gauges I proceed to hand finish with power and hand tools the required angles at various diameters on a jig I made.
Cupping etc. is then done, rear angle is critical to how it runs in the water the rooster tail give various clues when flat out.
My props are highly polished and razor sharp so extreme care is required to avoid injury.
Have been told that some of the fastest full size racing props are hand finished for that extra speed.
Roughed out prop on jig
windy is offline  
 
Reply With Quote
Old 07-31-2014, 10:42 PM   #37
waynes world
 
Join Date: Nov 2009
Posts: 55
Liked 3 Times on 3 Posts

Default

Thanks gents, lohring these props have similar lines to the jg Jim gale props in some ways? Yes have read most of your articles . Tether boats seems like most components are hand made to the greater percentage.
waynes world is offline  
 
Reply With Quote
Old 08-04-2014, 07:08 AM   #38
windy
 
windy's Avatar
 
Join Date: Feb 2010
Posts: 91
Liked 33 Times on 21 Posts
Likes Given: 24

Default

Sunday was very good with Bob Kirtley doing his personal best at 123.33 mph.
On my first run 128.29 mph with laps at 130mph.
Second attempt I fitted an air scoop for the burners it accelerated very fast but a fire ball melted water, fuel pipes and annealed a valve spring plus heat reflector melted it still did 117 mph.
With Bobs help he had some bacofoil and replacing damaged parts with just minutes before the last run it ran round at 128.87 mph with very little speed difference on the 5 timed laps.
Now I have got the engine on form the cylinder head must have been just below red heat near the inlet and the valve guide has a grey scale on it now.
There is a month before my next trial so back to the workshop to repair the fire damaged hull and try to find that extra mph.

Paul
windy is offline  
 
Reply With Quote
Old 08-06-2014, 03:48 AM   #39
windy
 
windy's Avatar
 
Join Date: Feb 2010
Posts: 91
Liked 33 Times on 21 Posts
Likes Given: 24

Default Kingsbury 3 August 2014 video

Quote:
Originally Posted by windy View Post
Sunday was very good with Bob Kirtley doing his personal best at 123.33 mph.
On my first run 128.29 mph with laps at 130mph.
Second attempt I fitted an air scoop for the burners it accelerated very fast but a fire ball melted water, fuel pipes and annealed a valve spring plus heat reflector melted it still did 117 mph.
With Bobs help he had some bacofoil and replacing damaged parts with just minutes before the last run it ran round at 128.87 mph with very little speed difference on the 5 timed laps.
Now I have got the engine on form the cylinder head must have been just below red heat near the inlet and the valve guide has a grey scale on it now.
There is a month before my next trial so back to the workshop to repair the fire damaged hull and try to find that extra mph.

Paul
Here are the days runs.
windy is offline  
lohring Likes This 
Reply With Quote
Old 08-06-2014, 04:57 AM   #40
Swifty
HMEM_SUPPORTER.png
 
Swifty's Avatar
 
Join Date: Mar 2012
Location: Melbourne, Australia
Posts: 2,253
Liked 813 Times on 595 Posts
Likes Given: 291

Default

That's some pitch you have there on the propeller. Never seen one as coarse as that before.

Paul.


Swifty is offline  
 
Reply With Quote
Reply


Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Cnc spindle ( high speed) chrispare CNC Machines and Conversions 7 06-25-2013 10:13 AM
Sealing high speed superheated steam poppet valve stem windy Questions and Answers 8 03-02-2013 02:05 AM
High speed CNC spindle dieselpilot Tools 134 06-07-2012 03:05 PM
high speed spindle on SX3 kjk Questions and Answers 0 04-22-2012 02:31 PM
High Speed Drill aussie bruce Tools 5 08-07-2009 12:16 AM





Newest Threads






- Top - Member List