**VOTE-ON-THE-NEXT-COX-ENGINE-OF-THE-MONTH** (November 2023)

Levent Suberk wrote:113 users online and only 24 votes! Interesting. *****Guests, please subscribe and vote******

Just looking at the statistics:


Those guests could be a combination of those viewing CEF but not logged in or have no account. It could also include other search engines including Ggl, Bing and Want and websites, when someone is searching.

But, we have 4583 registered users. Some of those have passed on, like Rusty and HappyDad. If we could encourage those who are still out there to return to the fold, that would be great.

Congrats for the win, @1/2A Nut Brad in Texas, you won by a clear margin!

Congratulations Nut , I love that Engine

Thank you all for participating and voting

ah I was just to late XD

robot797 wrote:ah I was just to late XD

There's always next month.

Congratulations Brad on a beautiful eye candy engine with performance to match!!!
Appreciate you sharing your fantastic nitro engine work!!

Robert

Congrats, Brad, that is a very nicely beefed up 020 TeeDee!

Thank you gents

Run up of the engine.



Oct 27, 2020
Kamtechnik Header Manifold / Cox .020 Prototype Testing
Cox TD .020 G-Mark .03 RC carb APC 4.2x2N
Open exhaust with RC carb: 22.2k rpm 42 mph PS
With manifold and header best noted peak 19.9k rpm 38 mph PS
5.4oz thrust / .035hp - 26w / P4 Turbo Plug / 25% nitro
-Reduces piercing tone
-Adds back pressure for RC carbs
-Single exhaust goo control  
-Can use a pressure tap
-Est. 21k with 35% nitro

 

Oh yes! Congratulations to 1/2A Nut (Brad) and his "TD .020 RC"!

Brad, I think that Kamtechnik header manifold never went into production, at least his webshop does not have it on stock?? Too bad, I would be interested to buy one..
G-Mark RC carbs are also a rarity, unfortunately..does the manufacturer still exist?

Congratulations on that "way-cool" engine Brad!

Congratulations Brad!, dear friend!...I wonder if you are always flying those model airplanes so fast?!

Congratulations Brad Beautiful engine buddy .

balogh wrote:Brad, I think that Kamtechnik header manifold never went into production,
at least his web shop does not have it on stock?? Too bad, I would be interested to buy one..
G-Mark RC carbs are also a rarity, unfortunately, does the manufacturer still exist?

The exhaust header may go into production one day, was discussed to potentially happen.
I have found 5 G-Mark .030 engines / carbs off Ebay - yes, company has closed.


1st Generation header test flown with the NANO .020 much cleaner airframe after a flight, still made good power.



Apr 17, 2018
First test of the manifold and header:
HQ 3.7 x 4.5 / static peak 20,833 / 3.6oz thrust / 89 mph PS / .054hp / 40w
Low goo at the end of the vid, zoomed in showing the top deck of the
fuselage typically covered in castor goo.


Here is test design that completely blocks off one port for pure single port function.
Shown in a FIRE configuration. Potential tuned pipe use, serious micro speed fun!



Apr 19, 2018
Cox Tee Dee .020 FIRE speed engine (Front Intake Rear Exhaust)
Peak: 3.3x4.5 / 23,175 rpm / 99 mph prop pitch speed /.047hp / 35.1w / 3oz thrust
25% nitro / 20% castor, required a cylinder that has fore and aft exhaust ports.

Pee Wizzer with a pressure tap!



Oct 5, 2019
Cox Pee Wee with pressure tap held good rpm!
17,603 rpm / HQ 4x4.5 carbon nylon prop / 75 mph pitch speed
3.52 oz thrust / .045hp - 33w / 25% nitro
Unloaded est. a bit over 21k rpm / 92 mph
Engine stayed very clean, great goo control!



Pipe oversized and was not sealed - just painting a picture here:





     

balogh wrote:Brad, I think that Kamtechnik header manifold never went into production, at least his webshop does not have it on stock?? Too bad, I would be interested to buy one..
G-Mark RC carbs are also a rarity, unfortunately..does the manufacturer still exist?

The Japanese G-Mark engines were produced by a subsidiary of the Citizen Watch Co and distributed by Cannon R/C in the US and Irvine in the UK [I don't know if there was a European distributor..but most likely Graupner if there was one...].....AFAIK I know it was a fairly small company and the principal/owner died, so production ceased some time in the 80s. Supposedly the rights and production tooling was subsequently purchased by a US company....most likely Mecoa-given that's their style....but the shipping container with all the tooling, residual parts inventory etc was lost overboard during the passage from Japan to the US.....and that was the end of it. Fortunately Greg Kamsyck has solved the head supply issue for the 03 with his turbo plug adaptor-and of course the larger models all take normal plugs.

G-Mark were quite an innovative company-producing-considering the size of the outfit-a surprising range of engines:

(1) 03 cu ins in std, R/c and heli versions
(2) 061 cu ins in std, R/C , car/heli versions [I've seen a marine unit but this may have been an aftermarket mod]....two distinct models of 061 bearing no resemblance to each other
(3) 12 R/c horizontally opposed twin (based on the 061 cylinder unit)
(4) 5cc (.30) geared radial based on the 061 unit
(5) .11 cu ins R/C glow
(6) .15 RC glow
(7) 5cc (.30 cu ins) horizontally opposed twin

....and no, I don't have the whole range, only the first three listed above. The 03 and 06 carbs are effective and relatively simple, so it should not be beyond the realms of possibility to duplicate them-the 03 carb doesn't even have an airbleed, whilst the 061 carb has a fixed airbleed, so machining is largely limited to making the body and the barrel. Both work remarkably well considering the simplicity...and of course 'idle' is around 6,000 rpm rather than the 2000 rpm we think of as normal for larger engines. NVAs might be a wee issue though for any replica carbs...but not impossible

ChrisM
'ffkiwi'