Model Diesel Engines - Page 201 - RC Groups
Thread Tools
Oct 23, 2011, 10:28 AM
Registered User
earlwb's Avatar
Annealing aluminum softens it so it doesn't crack when being worked. As you work it then the aluminum becomes work hardened. There is no limit for annealing aluminum, you can do it as many times as is needed to shape it.
Some alloys need to be annealed in a special heat treating facility and other "friendly" alloys can be heated up to near 800 degrees using torch. They would not have used the cheap alloys in the rod, unless it was a slag engine.
There are special temperature indicating crayons that you can get from welding supply stores.
I straightened out this rod for a engine myself very recently.

Last edited by earlwb; Oct 23, 2011 at 10:29 PM.
Sign up now
to remove ads between posts
Oct 23, 2011, 02:03 PM
Registered User
Gluehand's Avatar
Originally Posted by earlwb
I straightened out this rod for a engine myself very recently.
This is my work I have access to a small electric kiln which could be set on any choosen temperature....
What temperature should I aim for....?....and should the piece be quenched in water, e.g. like copper...?
Oct 23, 2011, 03:31 PM
Registered User
earlwb's Avatar
800 degrees Farenheit is the temperature limit. Any higher and the alloy might change its internal structure. You just let it cool down by itself. Aluminum melts at around 1100 to 1200 degrees, so one has to be careful of course.

Here is some information about it:

more technical:
Oct 23, 2011, 03:39 PM
Registered User
Gluehand's Avatar
Thanks for info & useful links......I'll give it a try....
Oct 23, 2011, 06:44 PM
Good Better Best quest.
olmod's Avatar
Earl knows Marker pens vary and test strips have to be made on sheeet allum, did you use dowel pins through the ends of the rod supported on paralels during the straightening ?.
Oct 23, 2011, 10:28 PM
Registered User
earlwb's Avatar
I have done that with larger rods. But with the .049 rod I straightened I did not.
I had a spare rod as well. But I didn't feel like making up a jig for the little rod to ensure it was perfectly straight and aligned.
See it works too:
Oct 25, 2011, 02:04 AM
Closed Account
Some Russian F2D engines - they appear to be MDS Specials
Oct 28, 2011, 11:04 PM
Closed Account
Engine test of the Cheetah & Lynx courtesy of Model Flyer Jan. 2002 issue
The Cheetah test courtesy of AMI (Aviation Modeller International) August 2000 issue
Last edited by Twin-Stack; Oct 29, 2011 at 01:04 AM.
Oct 28, 2011, 11:29 PM
Closed Account
With thanks to Aviation Modeller International magazine, Nov. 2000 issue
Oct 29, 2011, 12:04 AM
Registered User
earlwb's Avatar
The Mp-Jet letmo 2.5cc engine is a really sweet running engine. No nasty tendencies, it just works. We were discussing them here in this thread a while back
I was running Davis Diesel fuel with some extra castor oil added to it and I used a 11x6 prop on it.

Oct 29, 2011, 01:03 AM
Closed Account
Courtesy of Radio Control Model Flyer, Jan. 2003 issue
Oct 29, 2011, 01:19 AM
Closed Account
Courtesy of AMI (Aviation Modeller International) magazine, April 2003 issue
Oct 29, 2011, 02:07 PM
Registered User
rapmoz's Avatar

anybody could identify this pair of diesel heads with some remains of a red anodization?
The thread is metric, Webra? Taifun??
Many thanks, Chris
Oct 29, 2011, 03:15 PM
Registered User
Gluehand's Avatar

It seems to be the head of a Webra Record 1.5 cc of the "1954-59" version.

Here are some photos of mine, for comparison....

Last edited by Gluehand; Oct 29, 2011 at 03:27 PM.
Oct 29, 2011, 04:37 PM
Registered User
rapmoz's Avatar
Hello Gluehand,
Many, many thanks!

Here is the complete story: I recently acquired an inline twin crankshaft probably home made and this pair of heads. The crankshaft is complete, very well machined with double BB, just missing the needle AND a pair of cylinders/pistons !(pic#1)

I have noticed that the pair of heads screws perfectly on the cylinder of the glorious remains of a Taifun Hurrikan. (pic#2)

Unfortunately (for me) the upper and lower threads of the cylinder of the Hurrikan are not the same and the lower thread of the cylinder of this Hurrikan is slightly too large to screw onto the twin crankcase...

BUT the head thread of the Hurrikan screws perfectly onto the thread of the twin crankcase. (pic#3)
(I hope you follow me!)

SO if somebody owns a Webra Rekord, can unscrew the cylinder and verify that the upper and lower threads are the same, I know I will have to hunt for a pair of WEBRA REKORDS (or piston/cylinder assy!) to get a pretty" mini Taplin" !

Many thanks to have rode this curious story and sorry for my basic english!
PS: I just hope the piston rod will fit the twin crankshaft but it's another story!
Last edited by rapmoz; Oct 29, 2011 at 04:50 PM. Reason: typing error

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
diesel engines wyflyer_55 Fuel Plane Talk 18 Jul 15, 2017 02:14 PM
Diesel Engines Aeromister Engines 18 Apr 20, 2017 12:25 AM
scale model of engines dw1122 Life, The Universe, and Politics 4 Apr 11, 2016 11:39 AM
Discussion Need help with two diesel engines ! cosmin Engines 4 Apr 18, 2014 08:18 PM
WTB-Model Diesel Fuel slogo Aircraft - Fuel - Airplanes (FS/W) 3 Nov 13, 2004 10:42 PM