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Cox Engine Tests/reviews ONLY
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Cox Engine Tests/reviews ONLY
In response to a number of forum members' requests, I'm starting this new thread in the hope that we can centralise all the Cox engine reviews, tests etc. in one place, and use the thread for that purpose only.
To this end, would members with these items please post them HERE in future?
Kim and I hope that Admin will help us out in our endevours on members behalf, by making this thread a "Sticky" so that anyone can find it without the need for tedious searches.
It would also help if members who have posted reviews or tests in other places in the Forum could find them and re-post here.
To this end, would members with these items please post them HERE in future?
Kim and I hope that Admin will help us out in our endevours on members behalf, by making this thread a "Sticky" so that anyone can find it without the need for tedious searches.
It would also help if members who have posted reviews or tests in other places in the Forum could find them and re-post here.
Ivanhoe- Diamond Member
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Join date : 2011-09-30
Location : Northern Ireland
Ivanhoe- Diamond Member
- Posts : 1752
Join date : 2011-09-30
Location : Northern Ireland
Ivanhoe- Diamond Member
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Join date : 2011-09-30
Location : Northern Ireland
Kim- Top Poster
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Holland Hornet Factory Mod Peter Chinn July 1960 M.A.N. and Addtional Info
Mr. Chinn's take on a "Factory Modified Holland Hornet" from the July 1960 issue of Model Airplane News.
Also, Mark's Original Owner's Manual and his explanation of the "Timer Tank" feature on some of these engines.
_____________________________________________________________________________________________________
_________________________________________________________________________________________________________
Here's how the timer tank worked: Fire up the bad boy, set needle, just prior to launching your plane, you'd move the wire spring (held in place by small groove) another sping around the top of tube, inside the tank (see photos) would push the tube down sealing the top half of tank off, the bottom would be full and you'd have a premeasured, predictable run time.
[/quote]
Also, Mark's Original Owner's Manual and his explanation of the "Timer Tank" feature on some of these engines.
_____________________________________________________________________________________________________
Mark Boesen wrote:here's the early Hornet manual:
_________________________________________________________________________________________________________
Here's how the timer tank worked: Fire up the bad boy, set needle, just prior to launching your plane, you'd move the wire spring (held in place by small groove) another sping around the top of tube, inside the tank (see photos) would push the tube down sealing the top half of tank off, the bottom would be full and you'd have a premeasured, predictable run time.
[/quote]
Kim- Top Poster
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Medallion .15 R/C Engine Review M.A.N. Dec. 1964
Mr. Chinn from Model Airplane News...December, 1964.
[/quote]
[/quote]
Kim- Top Poster
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Re: Cox Engine Tests/reviews ONLY
Listing of Thimbledrome engine part numbers
Ivanhoe- Diamond Member
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Re: Cox Engine Tests/reviews ONLY
RknRusty wrote:Once the thread gets started, we can sticky it, no problem.
Please Sir, can we have a sticky now ?
Ivanhoe- Diamond Member
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Kim- Top Poster
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Re: Cox Engine Tests/reviews ONLY
Stickyed.
_________________
Don't Panic!
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while you're doing it!
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...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
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Re: Cox Engine Tests/reviews ONLY
RknRusty wrote:Stickyed.
Thank you, kind Sir!
Ivanhoe- Diamond Member
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Kim- Top Poster
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Re: Cox Engine Tests/reviews ONLY
Peter Chinn TD .09 Test, Model Aircraft December 1962
Ivanhoe- Diamond Member
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Re: Cox Engine Tests/reviews ONLY
You will find tons of tests of COX and others here:
http://sceptreflight.net/Model%20Engine%20Tests/Index.html
http://sceptreflight.net/Model%20Engine%20Tests/Index.html
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Re: McCoy .049 Peter Chinn Review January 1970 M.A.N.
Posted by Kim on Fri Apr 27, 2012 5:04 am, there is no option here to store as PDF. Here's a link (until it disappears). Suggest someone with admin privileges to download, and if there is a place in the forum to store it for others to access. If you give me a link on your server, I will update below:
George's Google Drive: McCoy 049 Engine Test Jan70MAN.pdf (2.6mb)
George's Google Drive: McCoy 049 Engine Test Jan70MAN.pdf (2.6mb)
GallopingGhostler- Top Poster
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Thank You
Some great information in the posts.
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Re: Cox Engine Tests/reviews ONLY
Welcome to the forum.
You will find plenty of great reads on tests here:http://www.sceptreflight.com/Model%20Engine%20Tests/
You will find plenty of great reads on tests here:http://www.sceptreflight.com/Model%20Engine%20Tests/
balogh- Top Poster
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1/2A Nut- Top Poster
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Re: Cox Engine Tests/reviews ONLY
I wonder how the compression was set.....it can only be reduced by any intervention, but not increased? Even by lapping that removes material, compression will not increase...He may have meant compression ratio setting by head gaskets or shims under the cylinder, instead of compression setting?? How does one add taper to a stock piston without reducing compression?
Just would like to understand the background, not doubting that overall the performance was increased..
Just would like to understand the background, not doubting that overall the performance was increased..
balogh- Top Poster
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Re: Cox Engine Tests/reviews ONLY
Andras, I’m not completely sure but I’m guessing compression was “set” would be to bring it to Cox factory specifications by setting ideal deck height (max compression) and then the user could adjust using head shims for fuel and weather….. I’m sure you’ve seen the instructions for setting deck height from Kustom Kraftsmanship that’s been posted a few times…. I decided to play with it on .020’s a little just out of curiosity and made the brass disc and bored out a burned out head…. Some of the PeeWee’s I have will not rotate past the disc due to interference….. Some will not touch it at all…. I adjusted Pageboy’s engine crankcase to barely touch it with a piece of .001” copper foil on top of the piston …Maybe that leaves a little room for ball/socket set?….
Another thing I found interesting in the KK instructions was to look for a SPI gap of about .012” on a .049….Best guess to figure it on a .020 was a percentage of stroke which puts it at about .009”…. Getting the deck level brings SPI very close to that figure…
With the adjustments I’m still using two head gaskets on 25% Nitro ….Just my thoughts on compression to be taken lightly
Another thing I found interesting in the KK instructions was to look for a SPI gap of about .012” on a .049….Best guess to figure it on a .020 was a percentage of stroke which puts it at about .009”…. Getting the deck level brings SPI very close to that figure…
With the adjustments I’m still using two head gaskets on 25% Nitro ….Just my thoughts on compression to be taken lightly
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Re: Cox Engine Tests/reviews ONLY
Yes ,Robert, this is what I meant, that it was the compression ratio, and not the compression, which was set by shims, head gaskets etc..the shim will also help set the SPI and change timing..so most probably the ratio was set..
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Re: Cox Engine Tests/reviews ONLY
Cox #5 TD .051 cylinder has a tapper fit, Joe lapped the cylinder in for more power.
The engine is in a time lock, untouched after Joe's pro setup.
This state of condition is very rare for 2023 and needed to be documented.
At some point will run the engine to document the performance of a fully
reworked TD .051 with the supplied prop and KK bushing for the APC 5.7x3
See list of services:
The engine is in a time lock, untouched after Joe's pro setup.
This state of condition is very rare for 2023 and needed to be documented.
At some point will run the engine to document the performance of a fully
reworked TD .051 with the supplied prop and KK bushing for the APC 5.7x3
See list of services:
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Re: Cox Engine Tests/reviews ONLY
Another Kustom Kraftsmanship Tee Dee .051 example sourced and can be compared.
Confirmed has the piston marked with a single ring etched into the lower part of the skirt.
Review for all to enjoy- lesson / instructions for breaking in the engine and a 1 way pressure valve.
Simple aluminum tube crimped in a way to seal with a small steel ball, the other end is pinched to
stop the ball from escaping the tube. Later down the road KK had a built in valve with the backplate.
Confirmed has the piston marked with a single ring etched into the lower part of the skirt.
Review for all to enjoy- lesson / instructions for breaking in the engine and a 1 way pressure valve.
Simple aluminum tube crimped in a way to seal with a small steel ball, the other end is pinched to
stop the ball from escaping the tube. Later down the road KK had a built in valve with the backplate.
Last edited by 1/2A Nut on Thu Apr 04, 2024 12:37 am; edited 2 times in total
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