Cox Engines Forum
You are not logged in! Please login or register.

Logged in members see NO ADVERTISEMENTS!


KK Cobra 0.8cc - Page 2 Cox_ba12




KK Cobra 0.8cc - Page 2 Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» Another of C.T. engines cleaned ---- Cox Tee Dee .09 --- Just today (3/26/2024) more Cox parts
by sosam117 Today at 6:59 am

» Indexing COX cylinders
by davidll1984 Today at 6:57 am

» Introducing our Cox .049 TD Engines
by Yabby Today at 6:33 am

» STUKA bomb dimentions needed
by latole Today at 5:44 am

» 1/2a Skyray plans?
by 944_Jim Yesterday at 10:14 pm

» Postage stamp backplates
by JPvelo Yesterday at 8:52 pm

» my attempt at making an exhaust throttle for Cox .049
by roddie Yesterday at 8:20 pm

» Cosmic Winds, - Big Guy, Little Guys, Silver Guy and Wounded Guy.
by rsv1cox Yesterday at 5:18 pm

» My friend Ramón, his Cox .09 & Cox .010
by MauricioB Yesterday at 12:31 pm

» Parts Cox TD-4
by rsv1cox Yesterday at 8:40 am

» On ebay a very special Cox engine
by davidll1984 Yesterday at 6:32 am

» Introducing the new - "QZ" RR-1
by Admin Yesterday at 12:51 am

Cox Engine of The Month
March-2024
balogh's

"COX Budapest" .049 engine



PAST WINNERS
CEF Traveling Engine

Win This Engine!
Gallery


KK Cobra 0.8cc - Page 2 Empty
Live on Patrol


KK Cobra 0.8cc

Page 2 of 2 Previous  1, 2

Go down

KK Cobra 0.8cc - Page 2 Empty Re: KK Cobra 0.8cc

Post  Oldenginerod Thu Mar 09, 2017 1:42 am

I would think that, if the bluing action oxidizes the surface, then removing the blue from the inside of the cylinder will also remove a small amount of oxidized metal. I would suggest that you allow the mating parts to do the polishing if any blue forms on the inside. That way, it will only remove the minimum necessary from the surface. As mentioned, I use a small paint brush. If any liquid inadvertidly makes its way to the inside surface I just rinse and leave it there. It has never effected the piston fit or performance of any engine I've blued.
Oldenginerod
Oldenginerod
Top Poster
Top Poster

Posts : 3962
Join date : 2012-06-15
Age : 61
Location : Drouin, Victoria

Back to top Go down

KK Cobra 0.8cc - Page 2 Empty Re: KK Cobra 0.8cc

Post  KariFS Thu Mar 09, 2017 1:58 am

Some time ago there was a discussion/speculation about reproducing complete Cox engines (Space Hopper was considered a good candidate) or parts using a CNC system, and earlier in this thread Mark's brilliant idea about using a Cox backplate with a cobra-style crankcase.

So, how about this: Who's the first to manufacture a crankcase that would convert a postage stamp engine to beam mount? Essentially it would be a Bee case with mounting lugs, it would use a modified (or unmodified) postage stamp backplate such as this:  

KK Cobra 0.8cc - Page 2 Image15

I think, with a modified intake and the fine thread needle valve this would make quite a hot and interesting little engine, and would give new life to all those forgotten RTF engines that people have in their junk boxes.
KariFS
KariFS
Diamond Member
Diamond Member

Posts : 1993
Join date : 2014-10-10
Age : 52

Back to top Go down

KK Cobra 0.8cc - Page 2 Empty Re: KK Cobra 0.8cc

Post  jmcalata Thu Mar 09, 2017 4:52 pm

Ian, you already run the Cobra ???

jmcalata
jmcalata
Gold Member
Gold Member

Posts : 442
Join date : 2012-01-30
Age : 56
Location : Guadalajara (Spain)

http://aeroguada.com

Back to top Go down

KK Cobra 0.8cc - Page 2 Empty Re: KK Cobra 0.8cc

Post  Mudhen Thu Mar 09, 2017 7:39 pm

.


Last edited by Mudhen on Tue Nov 16, 2021 9:08 am; edited 1 time in total
Mudhen
Mudhen
Gold Member
Gold Member

Posts : 489
Join date : 2011-09-19

Back to top Go down

KK Cobra 0.8cc - Page 2 Empty Re: KK Cobra 0.8cc

Post  ian1954 Mon Mar 13, 2017 10:09 am

jmcalata wrote:Ian, you already run the Cobra ???


I ran it up on 20% nitro and a 5x3 keil kraft nylon prop. It peaked at 16,000 revs but was unsteady. I got a steady run on a 5x4 kk prop and 15% nitro at around 14,500 revs.

I didn't spend too much time with it - just wanted to make sure it was a runner. It is quite a rare little beast and I didn't want to mess about with shims.

Jose, I hope you are not a mathematics teacher - this engine is not 68 years old - more like 57. In your video you referred to it as "grandad" - it is only eight years younger than you. More like a brother than a grandad!
ian1954
ian1954
Diamond Member
Diamond Member

Posts : 2688
Join date : 2011-11-16
Age : 69
Location : England

Back to top Go down

KK Cobra 0.8cc - Page 2 Empty Re: KK Cobra 0.8cc

Post  Sponsored content


Sponsored content


Back to top Go down

Page 2 of 2 Previous  1, 2

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum