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Cox Engine of The Month
July-2024
robot797's
![](https://i.servimg.com/u/f95/15/46/86/41/3_robo10.jpg)
"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
robot797's
![](https://i.servimg.com/u/f95/15/46/86/41/3_robo10.jpg)
"ULTIMITE COX 010: it has a clutch, E starter, throttle, exhaust, aluminum tank, aluminum venturi, gearbox with forward and reverse, and now its on a custom drawn and printed stand"
![](https://i.servimg.com/u/f95/15/46/86/41/sponso12.png)
PAST WINNERS
Greetings from Italy
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Greetings from Italy
Hi everyone from Italy
I've been quietly following this forum for quite some time and now I've decided to write my first post.
I am passionate about engines since I was a kid.and even now that I am 54 years old I continue to be fascinated.
In my own opinion Cox engines are simply fantastic from every point of view.
I have a little hobby equipment (a myford lathe and a little mill)and I delight in the restoration of old engines found in the flea markets but i also tried to build some prototipes from machining .
Congratulations again for this nice forum.
Franz Kleber
I've been quietly following this forum for quite some time and now I've decided to write my first post.
I am passionate about engines since I was a kid.and even now that I am 54 years old I continue to be fascinated.
In my own opinion Cox engines are simply fantastic from every point of view.
I have a little hobby equipment (a myford lathe and a little mill)and I delight in the restoration of old engines found in the flea markets but i also tried to build some prototipes from machining .
Congratulations again for this nice forum.
Franz Kleber
franzkleber- Moderate Poster
- Posts : 24
Join date : 2016-01-29
Age : 60
Re: Greetings from Italy
Sounds like you will fit right in here Franz.
Welcome aboard.
Bob
Welcome aboard.
Bob
rsv1cox- Top Poster
Posts : 10851
Join date : 2014-08-18
Location : West Virginia
Re: Greetings from Italy
WELCOME TO CEF!!!!!
Glad you're here Franz !!!!!
Glad you're here Franz !!!!!
Kim- Top Poster
Posts : 8590
Join date : 2011-09-06
Location : South East Missouri
Re: Greetings from Italy
Welcome Franz,
Your name sounds German not Italian!
Let us know what you are making with that lathe.
Ron
Your name sounds German not Italian!
Let us know what you are making with that lathe.
Ron
Cribbs74- Moderator
Posts : 11904
Join date : 2011-10-24
Age : 50
Location : Tuttle, OK
Re: Greetings from Italy
WELCOME TO THE FORUM Glad you decided to join in the fun!
Marleysky- Top Poster
Posts : 3618
Join date : 2014-09-28
Age : 71
Location : Grand Rapids, MI
Re: Greetings from Italy
Welcome to The CEF Forum Franz !!! Happy to hear from you , you sound like a engine guy .
![Babe Bee .049](/users/3015/29/34/60/smiles/976416.png)
getback- Top Poster
Posts : 10276
Join date : 2013-01-18
Age : 66
Location : julian , NC
Re: Greetings from Italy
Nice rear disc valve engine. Did you make it?
Welcome to the forum.
Welcome to the forum.
Jason_WI- Top Poster
Posts : 3123
Join date : 2011-10-09
Age : 49
Location : Neenah, WI
Re: Greetings from Italy
Yes i did it all by myself , its a 2.5 cc with zimmermann rear valve.
I had a "half idea" to take part in the Italian GIP 46 control line speed trophy, where rolling bearings are not allowed if using self-built engines.
So I tried the zimmermann valve as engine admission because I was hoping it would increase performance.
But unfortunatly the performances remained low anyway , with a graupner 6.5X6.5 and 10% nitro i can read about 15500 rpm ….i must definitely improve something ...
I had a "half idea" to take part in the Italian GIP 46 control line speed trophy, where rolling bearings are not allowed if using self-built engines.
So I tried the zimmermann valve as engine admission because I was hoping it would increase performance.
But unfortunatly the performances remained low anyway , with a graupner 6.5X6.5 and 10% nitro i can read about 15500 rpm ….i must definitely improve something ...
franzkleber- Moderate Poster
- Posts : 24
Join date : 2016-01-29
Age : 60
Re: Greetings from Italy
franzkleber wrote:Yes i did it all by myself , its a 2.5 cc with zimmermann rear valve.
Hi Franz,
Beautiful workmanship, and a very nice looking engine!
Have you flown it yet?
I know nothing about speed engines, but there are lots of speed fans on the forums.
Best of luck.
Bill
smooth_bill- Gold Member
- Posts : 229
Join date : 2012-02-19
Age : 87
Location : Beaverton, OR
Re: Greetings from Italy
Here's your long awaited
to The Forum!
That is some really fine craftsmanship there! Beautiful engine!
![Welcome](/users/3015/29/34/60/smiles/2120589027.gif)
That is some really fine craftsmanship there! Beautiful engine!
Re: Greetings from Italy
Looks like some Ron Valentine level work to me.
ticomareado- Account Under Review
- Posts : 1089
Join date : 2013-10-03
Location : NC
Re: Greetings from Italy
Welcome to the forum ... I'm glad you join, there are wonderful people here.
A pleasure to know about your work ... thanks for sharing!
A pleasure to know about your work ... thanks for sharing!
MauricioB- Top Poster
- Posts : 3649
Join date : 2016-02-16
Age : 53
Location : ARG
Re: Greetings from Italy
Welcome Franz..I am particularly happy that a new member strengthens the growing "European section" of CEF. Italians and Hungarians have always been famous for our CL speed engines like Rossi, Moki etc.
And I could not agree more that COX engines are fantastic.![Small Cox Logo](/users/3015/29/34/60/smiles/7356.png)
Also wanted to ask if you have tached your TeeDee09 with the 3D printed air scoop submitted to the COX Engine of the Month competition, and what your experience was? I would think that because of the ram pressure inside the scoop the static around the spraybar is higher than atmospheric so the atmospheric tank must be pressurized for a steady run?
And I could not agree more that COX engines are fantastic.
![Small Cox Logo](/users/3015/29/34/60/smiles/7356.png)
Also wanted to ask if you have tached your TeeDee09 with the 3D printed air scoop submitted to the COX Engine of the Month competition, and what your experience was? I would think that because of the ram pressure inside the scoop the static around the spraybar is higher than atmospheric so the atmospheric tank must be pressurized for a steady run?
balogh- Top Poster
Posts : 4803
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Greetings from Italy
Many thanks to all folks … unfortunatly i have to admit that i am very .... very far away from Valentine works !
I started "playing" with model engine only about 3 years ago …. and this "virus" has infected me deeply
I must say that I was lucky to meet an Italian guy who has been doing this kind of works for a long time, we live far away, he lives in Emilia Romagna near Modena but he became my mentor !
Last time we mets at a SAM 2001 Flying meeting its engine on the test bench exactly in the same conditions as mine exceeded 20,000 RPM!!
I was desperate and very disappointed
moral of the story i have to work a lot more!
I started "playing" with model engine only about 3 years ago …. and this "virus" has infected me deeply
![Very Happy](https://2img.net/i/fa/i/smiles/icon_biggrin.png)
I must say that I was lucky to meet an Italian guy who has been doing this kind of works for a long time, we live far away, he lives in Emilia Romagna near Modena but he became my mentor !
Last time we mets at a SAM 2001 Flying meeting its engine on the test bench exactly in the same conditions as mine exceeded 20,000 RPM!!
I was desperate and very disappointed
![Shocked](https://2img.net/i/fa/i/smiles/icon_eek.gif)
franzkleber- Moderate Poster
- Posts : 24
Join date : 2016-01-29
Age : 60
Re: Greetings from Italy
Also wanted to ask if you have tached your TeeDee09 with the 3D printed air scoop submitted to the COX Engine of the Month competition,
[/quote]
Hello balogh pleased to answer ,yes i tached it on the test bench only , with an APC 7x4 and a fuel 67 alcohol-23 oil-10 nitro i have seen a steady 15.600 RPM.
I find the suction very good , its start quickly and easily , and i want to try to increase slightly the venturi.
Now is equivalent to a hole diameter 2.9 mm (that is 6.6 mm2) i must check the original diameter on one new old stock engine ….. i think its a little bit bigger ...
[/quote]
Hello balogh pleased to answer ,yes i tached it on the test bench only , with an APC 7x4 and a fuel 67 alcohol-23 oil-10 nitro i have seen a steady 15.600 RPM.
I find the suction very good , its start quickly and easily , and i want to try to increase slightly the venturi.
Now is equivalent to a hole diameter 2.9 mm (that is 6.6 mm2) i must check the original diameter on one new old stock engine ….. i think its a little bit bigger ...
franzkleber- Moderate Poster
- Posts : 24
Join date : 2016-01-29
Age : 60
Re: Greetings from Italy
franzkleber wrote:Also wanted to ask if you have tached your TeeDee09 with the 3D printed air scoop submitted to the COX Engine of the Month competition,
Hello balogh pleased to answer ,yes i tached it on the test bench only , with an APC 7x4 and a fuel 67 alcohol-23 oil-10 nitro i have seen a steady 15.600 RPM.
[/quote]
I forgot to mention that the glow head is COX original but as it burned (
![Sad](https://2img.net/i/fa/i/smiles/icon_sad.gif)
franzkleber- Moderate Poster
- Posts : 24
Join date : 2016-01-29
Age : 60
Re: Greetings from Italy
Thanks Franz. As far as my calliper goes into the 09 venturi I can measure 3.5 mm diameter.
Did you pressurize the tank when using the air scoop?
Yes the turbo plug is the right solution. Normal plugs in such small engines like an 09 are just performance robbers because of the gas volume captured between the normal plug and head threads that spoils compression ratio.
Did you pressurize the tank when using the air scoop?
Yes the turbo plug is the right solution. Normal plugs in such small engines like an 09 are just performance robbers because of the gas volume captured between the normal plug and head threads that spoils compression ratio.
balogh- Top Poster
Posts : 4803
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Greetings from Italy
balogh wrote:Thanks Franz. As far as my calliper goes into the 09 venturi I can measure 3.5 mm diameter.
Did you pressurize the tank when using the air scoop?
Yes the turbo plug is the right solution. Normal plugs in such small engines like an 09 are just performance robbers because of the gas volume captured between the normal plug and head threads that spoils compression ratio.
Yes i am exactly of the same opinion , turbo plugs cost a little more but they are much better option.
The 3.5 mm sound right also to me , i will enlarge the venturi to 3.4-3.5 mm.
No pressurized tank because I'm not able to do and i like keep the think simple i am mainly passionate about engines and must confess that I did fly a control line airplane only once in my life with my 2.5 cc zimmermann , and after only 8 turns i broke the model in a bad Landing
![Rolling Eyes](https://2img.net/i/fa/i/smiles/icon_rolleyes.gif)
I have to improve and learn a lot also in these fields ...
![Crying or Very sad](https://2img.net/i/fa/i/smiles/icon_cry.gif)
franzkleber- Moderate Poster
- Posts : 24
Join date : 2016-01-29
Age : 60
Re: Greetings from Italy
Franz in this topic below I described my experience with a similar ( but a bit stone-age) solution and others commented and added useful advice:
https://www.coxengineforum.com/t7472-compressor-charged-td049?highlight=Turbo+charged
https://www.coxengineforum.com/t7472-compressor-charged-td049?highlight=Turbo+charged
balogh- Top Poster
Posts : 4803
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Greetings from Italy
Very Nice looking engine Franz .. ![Greetings from Italy Img_2012](https://i.servimg.com/u/f92/19/53/58/49/img_2012.jpg)
I am not an engine builder but from the look of the parts they are very beefy as in the rod /pis assy thick crank web // all these will contribute to slower runs and the 10 % nitro have you tried or can you get 35% or higher nitro ( even if the event want allow it, if just to try ) The back plate of the fit to CC were the O ring is needs work as not to protrude out ... Just saying
![Greetings from Italy Img_2012](https://i.servimg.com/u/f92/19/53/58/49/img_2012.jpg)
I am not an engine builder but from the look of the parts they are very beefy as in the rod /pis assy thick crank web // all these will contribute to slower runs and the 10 % nitro have you tried or can you get 35% or higher nitro ( even if the event want allow it, if just to try ) The back plate of the fit to CC were the O ring is needs work as not to protrude out ... Just saying
getback- Top Poster
Posts : 10276
Join date : 2013-01-18
Age : 66
Location : julian , NC
Re: Greetings from Italy
Welcome Franz!
Very impressive work, is that your own design?
Very impressive work, is that your own design?
KariFS- Diamond Member
- Posts : 2019
Join date : 2014-10-10
Age : 52
Re: Greetings from Italy
balogh wrote:Franz in this topic below I described my experience with a similar ( but a bit stone-age) solution and others commented and added useful advice:
https://www.coxengineforum.com/t7472-compressor-charged-td049?highlight=Turbo+charged
Wow you had the idea first and applied to a 0.051 TD!
One of the downside with my solution is the fact that it has become more complicated to cover the venturi to obtain more suction for an easy start … one finger is not enought and thepropelleris too close!
Still talking about the performance with 3.5 mm venturi and same fuel probably it can hit the target of 16.500 rpm …. i must try
![Very Happy](https://2img.net/i/fa/i/smiles/icon_biggrin.png)
franzkleber- Moderate Poster
- Posts : 24
Join date : 2016-01-29
Age : 60
Re: Greetings from Italy
KariFS wrote:Welcome Franz!
Very impressive work, is that your own design?
Hello KariFS , yes its all my own design and this explain also the low performance , it need some modifications to release all its potential but i am a little hesitant to make heavy changes.
Now it starts easily and makes a lot of noise
![Laughing](https://2img.net/i/fa/i/smiles/icon_lol.gif)
![Laughing](https://2img.net/i/fa/i/smiles/icon_lol.gif)
franzkleber- Moderate Poster
- Posts : 24
Join date : 2016-01-29
Age : 60
Re: Greetings from Italy
Franz put the bar higher! My 09 with stock carb swings a 7x4 APC prop at around 16k. I think this is basically what you may also read in the sceptre flight reports: http://www.sceptreflight.com/Model%20Engine%20Tests/Cox%20Tee%20Dee%2009.html
![Greetings from Italy 15516210](https://i.servimg.com/u/f48/19/92/56/25/15516210.jpg)
I think if the scoop really increases the airflow and the tank is pressurized a 18k speed with a 7x4 prop is doable!
![Greetings from Italy 15516210](https://i.servimg.com/u/f48/19/92/56/25/15516210.jpg)
I think if the scoop really increases the airflow and the tank is pressurized a 18k speed with a 7x4 prop is doable!
balogh- Top Poster
Posts : 4803
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
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