A aviation & planes forum. AviationBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AviationBanter forum » rec.aviation newsgroups » Home Built
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

DIY Two-Stroke Engine



 
 
Thread Tools Display Modes
  #21  
Old March 8th 10, 05:35 AM posted to rec.crafts.metalworking,rec.aviation.homebuilt,rec.aviation.ultralight,rec.models.scale,uk.rec.models.engineering
[email protected]
external usenet poster
 
Posts: 155
Default DIY Two-Stroke Engine

On Sun, 7 Mar 2010 23:04:37 +0000, Nigel Eaton
wrote:

In article
,
bizguy writes
You could look at outboard motors as a starting point. In the past I
read of someone using a Mercury to get 100 hp in an aircraft.


That seems unlikely, to be honest. I've never met an outboard that
wasn't cooled by pumped water.

Can be cooled very well with a radiator - the interface to connect a
rad instead of the raw water cooling was possible, but not simple.
There were "saltie" conversions that used a sealed cooling system and
a heat exhanger availble for some of the outboards of the period, but
they were not common. Very common with stern-drives (4 stroke)

Actually, there WAS a commercially available helicopter kit that DID
use the V4 Evinrude power head - and I believe I've seen refference to
the 6 cyl Merc "black max" in experimental aircraft use too.
  #22  
Old March 8th 10, 01:54 PM posted to rec.crafts.metalworking,rec.aviation.homebuilt,rec.aviation.ultralight,rec.models.scale,uk.rec.models.engineering
cavelamb[_2_]
external usenet poster
 
Posts: 257
Default DIY Two-Stroke Engine

Nigel Eaton wrote:
In article
,
bizguy writes
You could look at outboard motors as a starting point. In the past I
read of someone using a Mercury to get 100 hp in an aircraft.


That seems unlikely, to be honest. I've never met an outboard that
wasn't cooled by pumped water.



I had a really nice 5 HP Briggs and Stratton outboard on my previous
sailboat. It was air cooled. But it was the exception that proved
the rule...

http://www.duckworksmagazine.com/03/...p/06/index.htm
--

Richard Lamb
http://www.home.earthlink.net/~cavelamb/

  #23  
Old March 8th 10, 05:38 PM posted to rec.crafts.metalworking,rec.aviation.homebuilt,rec.aviation.ultralight,rec.models.scale,uk.rec.models.engineering
Peter Fairbrother
external usenet poster
 
Posts: 1
Default DIY Two-Stroke Engine

cavelamb wrote:
Nigel Eaton wrote:
In article
,
bizguy writes
You could look at outboard motors as a starting point. In the past I
read of someone using a Mercury to get 100 hp in an aircraft.


That seems unlikely, to be honest. I've never met an outboard that
wasn't cooled by pumped water.



I had a really nice 5 HP Briggs and Stratton outboard on my previous
sailboat. It was air cooled. But it was the exception that proved
the rule...

http://www.duckworksmagazine.com/03/...p/06/index.htm


Without knowing anything much about ultralights (beyond they look fun
but dangerous) wouldn't the obvious source of lightweight engines in
that power range be motorcycle engines?

-- Peter Fairbrother
  #24  
Old March 8th 10, 11:28 PM posted to rec.crafts.metalworking,rec.aviation.homebuilt,rec.aviation.ultralight
Anyolmouse
external usenet poster
 
Posts: 138
Default DIY Two-Stroke Engine


"durabol" wrote in message
...
For the last few years I have toyed with the idea of building a
homemade two-stroke engine for UL use. What keyed my interest was
reading about homemade model aircraft engines and reading and watching
a re-enactment of the Wright brother's first flight with a replica
engine (not a two-stroke engine).

Has anyone made a 2-stroke engine from scratch? One may need to cast
aluminium, may need a lathe and milling machine with boring head and
hone or perhaps the boring and honing of the cylinder and bearing
journals could be farmed out. A commercial carburetor and piston could
be used. Two-stroke engines seem simple enough that home construction
may be possible, if not practical.

A direct drive engine will be that much heavier when you take into
account the weight of the drive reduction system. I have calculated
the weight of an 80x80mm bore and stroke 2 cylinder opposed engine and
it was a bit under 40lbs which should give about 1hp/lbs. I used 10mm
cylinder and crankcase wall thickness and a 1.25" dia crank.

I have got some idea of port-time-area from the freeware computer
program called "BiMotion". I'm not sure how good the data is for
lowish speed engines but I guess it is a start. I have also worked up
a spreadsheet for similar information.

I don't think a reed valve system is needed for this engine since it
is only going to operate at a fairly narrow rpm range and the port
timing isn't critical. Piston ported valves offer similar performance
to other induction types but only over a narrow rpm range which is
what I have planned for the engine. I plan to build an engine with a
restrictive exhaust to ensure no fuel escapes. I have heard that
piston ported engines can spit some fuel out of the carb at idle but
this doesn't seem like a major problem. Rotary valves via crank shaft
induction (disk or drum valves as well) is an interesting idea but I
don't think I need the critical timing they provide.

I was planning on using the largest two-stroke piston (not a diesel
piston) I could find and using the largest stoke that was reasonable,
something like 90x105mm

Brock


How about a 2 stroke radial developed by Pontiac for their X-4 1,500lb
car in 1969.
http://www.popsci.com/archive-viewer...lt+airpl anes

Popular Science has just released ALL of their archives for free
http://www.popsci.com/archives and found it while searching for
homebuilt airplanes.

--
A man is known by the company he keeps- Unknown

Anyolmouse


  #25  
Old March 9th 10, 04:47 AM posted to rec.crafts.metalworking,rec.aviation.homebuilt,rec.aviation.ultralight
bod43
external usenet poster
 
Posts: 41
Default DIY Two-Stroke Engine

On 8 Mar, 22:28, "Anyolmouse" wrote:
"durabol" wrote in message

...



For the last few years I have toyed with the idea of building a
homemade two-stroke engine for UL use. What keyed my interest was
reading about homemade model aircraft engines and reading and watching
a re-enactment of the Wright brother's first flight with a replica
engine (not a two-stroke engine).


Has anyone made a 2-stroke engine from scratch? One may need to cast
aluminium, may need a lathe and milling machine with boring head and
hone or perhaps the boring and honing of the cylinder and bearing
journals could be farmed out. A commercial carburetor and piston could
be used. Two-stroke engines seem simple enough that home construction
may be possible, if not practical.


A direct drive engine will be that much heavier when you take into
account the weight of the drive reduction system. I have calculated
the weight of an 80x80mm bore and stroke 2 cylinder opposed engine and
it was a bit under 40lbs which should give about 1hp/lbs. I used 10mm
cylinder and crankcase wall thickness and a 1.25" dia crank.


I have got some idea of port-time-area from the freeware computer
program called "BiMotion". I'm not sure how good the data is for
lowish speed engines but I guess it is a start. I have also worked up
a spreadsheet for similar information.


I don't think a reed valve system is needed for this engine since it
is only going to operate at a fairly narrow rpm range and the port
timing isn't critical. Piston ported valves offer similar performance
to other induction types but only over a narrow rpm range which is
what I have planned for the engine. I plan to build an engine with a
restrictive exhaust to ensure no fuel escapes. I have heard that
piston ported engines can spit some fuel out of the carb at idle but
this doesn't seem like a major problem. Rotary valves via crank shaft
induction (disk or drum valves as well) is an interesting idea but I
don't think I need the critical timing they provide.


I was planning on using the largest two-stroke piston (not a diesel
piston) I could find and using the largest stoke that was reasonable,
something like 90x105mm


www.deltahawk.com

Too big for ultralight I would guess but seems like
a very fine plan for a light aircraft engine.

160 hp and upwards

V4 two stroke diesel.

Has crank driven air pump + turbo.

No electrics *at_all* for engine operation.

Will continue running if air pump OR turbo fails.
Will run at about 50% power (check web site for details)
if all water is lost.

Seems a *very* fine thing to me.

Expected to be accepted as a FAA certified
aero engine this year.

200hp planned.

V8 in the future.

  #26  
Old March 9th 10, 04:48 AM posted to rec.crafts.metalworking,rec.aviation.homebuilt,rec.aviation.ultralight
bod43
external usenet poster
 
Posts: 41
Default DIY Two-Stroke Engine

On 9 Mar, 03:47, bod43 wrote:
On 8 Mar, 22:28, "Anyolmouse" wrote:



"durabol" wrote in message


...


For the last few years I have toyed with the idea of building a
homemade two-stroke engine for UL use. What keyed my interest was
reading about homemade model aircraft engines and reading and watching
a re-enactment of the Wright brother's first flight with a replica
engine (not a two-stroke engine).


Has anyone made a 2-stroke engine from scratch? One may need to cast
aluminium, may need a lathe and milling machine with boring head and
hone or perhaps the boring and honing of the cylinder and bearing
journals could be farmed out. A commercial carburetor and piston could
be used. Two-stroke engines seem simple enough that home construction
may be possible, if not practical.


A direct drive engine will be that much heavier when you take into
account the weight of the drive reduction system. I have calculated
the weight of an 80x80mm bore and stroke 2 cylinder opposed engine and
it was a bit under 40lbs which should give about 1hp/lbs. I used 10mm
cylinder and crankcase wall thickness and a 1.25" dia crank.


I have got some idea of port-time-area from the freeware computer
program called "BiMotion". I'm not sure how good the data is for
lowish speed engines but I guess it is a start. I have also worked up
a spreadsheet for similar information.


I don't think a reed valve system is needed for this engine since it
is only going to operate at a fairly narrow rpm range and the port
timing isn't critical. Piston ported valves offer similar performance
to other induction types but only over a narrow rpm range which is
what I have planned for the engine. I plan to build an engine with a
restrictive exhaust to ensure no fuel escapes. I have heard that
piston ported engines can spit some fuel out of the carb at idle but
this doesn't seem like a major problem. Rotary valves via crank shaft
induction (disk or drum valves as well) is an interesting idea but I
don't think I need the critical timing they provide.


I was planning on using the largest two-stroke piston (not a diesel
piston) I could find and using the largest stoke that was reasonable,
something like 90x105mm


www.deltahawk.com

Too big for ultralight I would guess but seems like
a very fine plan for a light aircraft engine.

160 hp and upwards

V4 two stroke diesel.

Has crank driven air pump + turbo.

No electrics *at_all* for engine operation.

Will continue running if air pump OR turbo fails.
Will run at about 50% power (check web site for details)
if all water is lost.

Seems a *very* fine thing to me.

Expected to be accepted as a FAA certified
aero engine this year.

200hp planned.

V8 in the future.


Oh yes - direct drive. No gears needed.
  #27  
Old March 9th 10, 05:55 AM posted to rec.crafts.metalworking,rec.aviation.homebuilt,rec.aviation.ultralight
Tim Wescott
external usenet poster
 
Posts: 15
Default DIY Two-Stroke Engine

bod43 wrote:
On 8 Mar, 22:28, "Anyolmouse" wrote:
"durabol" wrote in message

...



For the last few years I have toyed with the idea of building a
homemade two-stroke engine for UL use. What keyed my interest was
reading about homemade model aircraft engines and reading and watching
a re-enactment of the Wright brother's first flight with a replica
engine (not a two-stroke engine).
Has anyone made a 2-stroke engine from scratch? One may need to cast
aluminium, may need a lathe and milling machine with boring head and
hone or perhaps the boring and honing of the cylinder and bearing
journals could be farmed out. A commercial carburetor and piston could
be used. Two-stroke engines seem simple enough that home construction
may be possible, if not practical.
A direct drive engine will be that much heavier when you take into
account the weight of the drive reduction system. I have calculated
the weight of an 80x80mm bore and stroke 2 cylinder opposed engine and
it was a bit under 40lbs which should give about 1hp/lbs. I used 10mm
cylinder and crankcase wall thickness and a 1.25" dia crank.
I have got some idea of port-time-area from the freeware computer
program called "BiMotion". I'm not sure how good the data is for
lowish speed engines but I guess it is a start. I have also worked up
a spreadsheet for similar information.
I don't think a reed valve system is needed for this engine since it
is only going to operate at a fairly narrow rpm range and the port
timing isn't critical. Piston ported valves offer similar performance
to other induction types but only over a narrow rpm range which is
what I have planned for the engine. I plan to build an engine with a
restrictive exhaust to ensure no fuel escapes. I have heard that
piston ported engines can spit some fuel out of the carb at idle but
this doesn't seem like a major problem. Rotary valves via crank shaft
induction (disk or drum valves as well) is an interesting idea but I
don't think I need the critical timing they provide.
I was planning on using the largest two-stroke piston (not a diesel
piston) I could find and using the largest stoke that was reasonable,
something like 90x105mm


www.deltahawk.com

Too big for ultralight I would guess but seems like
a very fine plan for a light aircraft engine.

160 hp and upwards

V4 two stroke diesel.

Has crank driven air pump + turbo.

No electrics *at_all* for engine operation.

Will continue running if air pump OR turbo fails.
Will run at about 50% power (check web site for details)
if all water is lost.

Seems a *very* fine thing to me.

Expected to be accepted as a FAA certified
aero engine this year.

200hp planned.

V8 in the future.

That link redirects to a poster site.

--
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com
  #28  
Old March 9th 10, 01:36 PM posted to rec.crafts.metalworking,rec.aviation.homebuilt,rec.aviation.ultralight
Jim Wilkins
external usenet poster
 
Posts: 57
Default DIY Two-Stroke Engine

On Mar 8, 11:55*pm, Tim Wescott wrote:
...
www.deltahawk.com


That link redirects to a poster site.
Tim Wescott


http://www.deltahawkengines.com/

Any day now.....

jsw
  #29  
Old March 9th 10, 04:21 PM posted to rec.crafts.metalworking,rec.aviation.homebuilt,rec.aviation.ultralight
Anna
external usenet poster
 
Posts: 2
Default DIY Two-Stroke Engine

Jim Wilkins wrote:
On Mar 8, 11:55 pm, Tim Wescott wrote:
...
www.deltahawk.com


That link redirects to a poster site.
Tim Wescott


http://www.deltahawkengines.com/

Any day now.....

jsw


saw the price? 71 Thou $$$$$$
  #30  
Old March 9th 10, 04:26 PM posted to rec.crafts.metalworking,rec.aviation.homebuilt,rec.aviation.ultralight
Anna
external usenet poster
 
Posts: 2
Default DIY Two-Stroke Engine

Anna wrote:
Jim Wilkins wrote:
On Mar 8, 11:55 pm, Tim Wescott wrote:
...
www.deltahawk.com


That link redirects to a poster site.
Tim Wescott


http://www.deltahawkengines.com/

Any day now.....

jsw


saw the price? 71 Thou $$$$$$


sorry, 'only' 62.500$ for Deltahawk
 




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

vB 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
2-stroke diesel is the (near) future? Max Kallio Home Built 134 July 18th 05 12:39 AM
Small 4 stroke engine? Ron Wanttaja Home Built 35 July 2nd 05 07:25 PM
How about 2-stroke diesel for helicopters Max Kallio Rotorcraft 3 March 31st 05 04:46 PM
BSFC vs gas mileage, 2 stroke vs 4 stroke Jay Home Built 10 August 24th 04 02:26 PM
McCullough Two-Stroke Relaibility Gordon Arnaut Home Built 0 June 15th 04 10:26 PM


All times are GMT +1. The time now is 11:48 AM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 AviationBanter.
The comments are property of their posters.