Cox Engines Forum
You are not logged in! Please login or register! Guests are limited to posting in the "General Questions (Guest Posting Allowed)" section only. Becoming a member is fast, easy and FREE!


.010 and .020 top ends Babe_b10
Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Cox Engine of The Month
July-2019
Mike1484's

"Tee Dee .020 on a free-flight model"



PAST WINNERS
Speed Contest 2019
CEF Traveling Engine

Win This Engine!
The Traveling Prop
Gallery


.010 and .020 top ends Empty
World of Aviation

.010 and .020 top ends

Go down

.010 and .020 top ends Empty .010 and .020 top ends

Post  Dizzyman2011 on Wed Jan 09, 2013 9:56 am

Hi all have been posting a thread about my free flight project but think I might need less power my question is this do 010 and 020 top ends fit on standard 049 crankcases and if so is there anything else I need I don't really want to have an internal tank so postage stamp or product back plates will be the order of the day if they do fit does anyone know where I can get either top ends also same glow plug ??? Sorry for such a newbie question but have never had anything smaller than an 049
Cheers
Dizzyman2011
Dizzyman2011
Gold Member
Gold Member

Posts : 391
Join date : 2012-11-21
Age : 37
Location : Newbury Berkshire uk

View user profile

Back to top Go down

.010 and .020 top ends Empty Re: .010 and .020 top ends

Post  Cribbs74 on Wed Jan 09, 2013 10:17 am

Nope, not even close. There are ways to detune your .049 though.
Cribbs74
Cribbs74
Moderator

Trusted Seller
Posts : 10413
Join date : 2011-10-24
Age : 45
Location : Tuttle, OK

View user profile

Back to top Go down

.010 and .020 top ends Empty Re: .010 and .020 top ends

Post  RknRusty on Wed Jan 09, 2013 10:19 am

The .049 crankcase is a good bit larger than the .010 and .020, so the cylinders will not fit.

_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!


My Hot Rock & Blues Playlist
RknRusty
RknRusty
Moderator

Posts : 10775
Join date : 2011-08-10
Age : 63
Location : South Carolina, USA

View user profile

Back to top Go down

.010 and .020 top ends Empty Re: .010 and .020 top ends

Post  Dizzyman2011 on Wed Jan 09, 2013 11:17 am

cribbs74 wrote:Nope, not even close. There are ways to detune your .049 though.

Ok that sounds promising very strange for me to want to detune an engine first time ever in fact but that is what is needed for this project ... go on do tell how can I detune I have a muffler head shims timing shims etc and some old non spi top ends am I anywhere near yet ??
Dizzyman2011
Dizzyman2011
Gold Member
Gold Member

Posts : 391
Join date : 2012-11-21
Age : 37
Location : Newbury Berkshire uk

View user profile

Back to top Go down

.010 and .020 top ends Empty Re: .010 and .020 top ends

Post  John Goddard on Wed Jan 09, 2013 11:26 am

Simplest one Phill, is to turn the prop around.
Then lower nitro, which will give a longer run time too.
Run the needle rich so runs off peak.
All without even needing a wrench.
Very Happy
John Goddard
John Goddard
Diamond Member
Diamond Member

Trusted Seller
Posts : 2447
Join date : 2011-11-24
Age : 54
Location : Leyton North East London

View user profile

Back to top Go down

.010 and .020 top ends Empty Re: .010 and .020 top ends

Post  RknRusty on Wed Jan 09, 2013 11:47 am

Yep, the backwards prop works to tame it. So does a 6" prop. An old non-SPI cylinder is a good way to go, especially if it only has one bypass port. I hate to resort to running rich, but it'll do in a pinch. You might get a varnish buildup that way. Add another head shim or two to lower the compression. But that might make it harder to crank.

_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!


My Hot Rock & Blues Playlist
RknRusty
RknRusty
Moderator

Posts : 10775
Join date : 2011-08-10
Age : 63
Location : South Carolina, USA

View user profile

Back to top Go down

.010 and .020 top ends Empty Re: .010 and .020 top ends

Post  Dizzyman2011 on Wed Jan 09, 2013 3:45 pm

Ok thanks John thanks rusty
Will turn the prop around run an old non spi barell put a shim in put my silencer and run a bigger prop would I be in 020 territory do u think (running of song rich) that is or am I still overpowered
What does an 020 swing a 6x4 at (ball park figure ) also an 010 for reference would be useful although I realise a 010 probably wouldn't ever use a 6x4 just wanted to get some idea of power I'm tying to get too any idea what you would all consider ideal for the model I'm building at the mo on my other thread "free flight project"
Cheers for the help and tips never thought of turning the prop around !!!! That's why I love this forum ... Many minds and much experience
Dizzyman2011
Dizzyman2011
Gold Member
Gold Member

Posts : 391
Join date : 2012-11-21
Age : 37
Location : Newbury Berkshire uk

View user profile

Back to top Go down

.010 and .020 top ends Empty Re: .010 and .020 top ends

Post  Dizzyman2011 on Wed Jan 09, 2013 4:02 pm

Just to add not really too worried about varnish buildup as the timer I will be running this with only has 22 seconds duration and all my engines get a full strip down every couple of months but good to know will keep on top of that rusty cheers Very Happy
Dizzyman2011
Dizzyman2011
Gold Member
Gold Member

Posts : 391
Join date : 2012-11-21
Age : 37
Location : Newbury Berkshire uk

View user profile

Back to top Go down

.010 and .020 top ends Empty Re: .010 and .020 top ends

Post  RknRusty on Wed Jan 09, 2013 7:49 pm

You would probably overheat an .020 with a 6x4 prop, that's just outside of its design limits.

_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!


My Hot Rock & Blues Playlist
RknRusty
RknRusty
Moderator

Posts : 10775
Join date : 2011-08-10
Age : 63
Location : South Carolina, USA

View user profile

Back to top Go down

.010 and .020 top ends Empty Re: .010 and .020 top ends

Post  Surfer_kris on Thu Jan 10, 2013 1:14 am

I don't understand the problem, 30" wingspan and a cox .049 is a good combination. Just let the engine pull the plane up high, the timer stops the engine, and then free-flight down.
Surfer_kris
Surfer_kris
Diamond Member
Diamond Member

Posts : 1564
Join date : 2010-11-20
Location : Sweden

View user profile

Back to top Go down

.010 and .020 top ends Empty Re: .010 and .020 top ends

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

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