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

Logged in members see NO ADVERTISEMENTS!


Wen Mac .049 - Conditioning. - Page 3 Cox_ba12




Wen Mac .049 - Conditioning. - Page 3 Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» K&B Torp Jr 035 glow plug(s)
by Oldenginerod Today at 1:55 am

» Scientific Gulfhawk
by duaneh Today at 1:21 am

» Sold out Cox .049 silencers for sale
by 1/2A Nut Yesterday at 7:24 pm

» Roddie tears-down his recent bench-run engine
by davidll1984 Yesterday at 7:11 pm

» Nostalgia alert, my 1959 Corvette revisited
by rsv1cox Yesterday at 6:19 pm

» Does this book interest anyone?
by GallopingGhostler Yesterday at 6:13 pm

» Cox Ryan ST 2.0
by GallopingGhostler Yesterday at 3:47 pm

» Gut instinct
by Onelife Tue May 21, 2024 5:39 pm

» My Cox .049 reedy with a Galbreath head and Nelson plug
by F4D Phantom II Tue May 21, 2024 11:03 am

» audio-tach anyone?
by roddie Mon May 20, 2024 9:09 pm

» Jim Walkers FireBee - This is going to be fun
by rsv1cox Mon May 20, 2024 8:16 pm

» Prayers for my Wife Please
by fit90 Mon May 20, 2024 7:34 am

Cox Engine of The Month
May-2024
1/2A Nut's

"Cox Tee Dee .051 RC Marine"



PAST WINNERS
CEF Traveling Engine

Win This Engine!
Gallery


Wen Mac .049 - Conditioning. - Page 3 Empty
Live on Patrol


Wen Mac .049 - Conditioning.

Page 3 of 3 Previous  1, 2, 3

Go down

Wen Mac .049 - Conditioning. - Page 3 Empty Re: Wen Mac .049 - Conditioning.

Post  MauricioB Mon Apr 15, 2024 6:24 pm

Juan, you have done a very good job!, very neat!
Thanks for your contribution.
I think the Wen Mac .049 is already at its right point, but you invite me to think.....and maybe I round the original venturi, killing the edge it has, surely something will help, I also plan to place the pressure peak in the butt, so I continue investigating and having fun.
The Wen Mac has an incredible nostalgic charm, it must be because of its shape, its aesthetics. Surely wonderful times of the generation of engines for modellers!
MauricioB
MauricioB
Top Poster
Top Poster

Posts : 3595
Join date : 2016-02-16
Age : 53
Location : ARG

Back to top Go down

Wen Mac .049 - Conditioning. - Page 3 Empty Re: Wen Mac .049 - Conditioning.

Post  MauricioB Mon Apr 15, 2024 6:42 pm

I'm looking at photos on the web, it seems common to have a brand registration on the cylinder in these engines, above the number .049 (I indicate it in the photo with arrows)...so I wonder:
1) Will these marks be from some original acceleration control device?
either
2) Will they be factory machining marks??? and no acceleration device originally goes there?!....who knows?

Wen Mac .049 - Conditioning. - Page 3 Web310

appointment:
https://pocatellomarket.com/products/wen-mac-mk-ii-049-model-plane-engine-gas
MauricioB
MauricioB
Top Poster
Top Poster

Posts : 3595
Join date : 2016-02-16
Age : 53
Location : ARG

Back to top Go down

Wen Mac .049 - Conditioning. - Page 3 Empty Re: Wen Mac .049 - Conditioning.

Post  MauricioB Mon Apr 15, 2024 7:04 pm

Is there a plan for this beautiful Wen-Mac model...the Aromite??? If anyone has information, I would appreciate it!

Wen Mac .049 - Conditioning. - Page 3 Aromit10
MauricioB
MauricioB
Top Poster
Top Poster

Posts : 3595
Join date : 2016-02-16
Age : 53
Location : ARG

Back to top Go down

Wen Mac .049 - Conditioning. - Page 3 Empty Re: Wen Mac .049 - Conditioning.

Post  MauricioB Mon Apr 15, 2024 9:21 pm

Juan, Jorge and Horacio, following some of your recommendations, it then occurred to me to improve the venturi inlet, making a ring with rounded edges, through which the air flows better.
Ok, it was worth it, the engine went up to 300 rpm!!..that is to say, it improved.
Here are the photos, this work is dedicated to you! Thanks friends!
Sorry for the quality of the photos, but wanting to do everything together and at the same time is crazy hahaha

PROCESS:

Wen Mac .049 - Conditioning. - Page 3 20240435
Wen Mac .049 - Conditioning. - Page 3 20240436
Wen Mac .049 - Conditioning. - Page 3 20240437
Wen Mac .049 - Conditioning. - Page 3 20240438
Wen Mac .049 - Conditioning. - Page 3 20240439

TEST:

Wen Mac .049 - Conditioning. - Page 3 20240441
Wen Mac .049 - Conditioning. - Page 3 20240442
Wen Mac .049 - Conditioning. - Page 3 20240443

Ring Venturi:

Wen Mac .049 - Conditioning. - Page 3 20240444








MauricioB
MauricioB
Top Poster
Top Poster

Posts : 3595
Join date : 2016-02-16
Age : 53
Location : ARG

Back to top Go down

Wen Mac .049 - Conditioning. - Page 3 Empty Re: Wen Mac .049 - Conditioning.

Post  F4D Phantom II Mon Apr 15, 2024 9:51 pm

Juan, Jorge and Horacio, following some of your recommendations, it then occurred to me to improve the venturi inlet, making a ring with rounded edges, through which the air flows better.
Ok, it was worth it, the engine went up to 300 rpm!!..that is to say, it improved.
Here are the photos, this work is dedicated to you! Thanks friends!
Sorry for the quality of the photos, but wanting to do everything together and at the same time is crazy hahaha

Hello Mauricio
I`m glad you found a way to improve airflow with the venturi lip you made smoothing airflow into the engine and that it has brought better performance from the little engine. I also enjoy working on old engines that I didn`t have as a kid. Cox engines were available at the local hobby shop and that was how I started in Aeromodeling. I don`t remember seeing OK,Wen Mac,Royal Spitfire and Others till later when I was older.
Juan
F4D Phantom II
F4D Phantom II
Gold Member
Gold Member

Posts : 190
Join date : 2019-04-08

Back to top Go down

Wen Mac .049 - Conditioning. - Page 3 Empty Re: Wen Mac .049 - Conditioning.

Post  rdw777 Tue Apr 16, 2024 5:22 am

The vintage Wen Mac with throttle came out very nice Mauricio….. You are very talented to be able to make the custom parts on your lathe….. There should be some here that know more about the Aeromite…. It was a very early ready to fly control line airplane…. Maybe you could build a replica for your engine?
rdw777
rdw777
Diamond Member
Diamond Member

2022 Supporter

2023 Supporter

2024 Supporter

Posts : 1352
Join date : 2021-03-11
Location : West Texas

Back to top Go down

Wen Mac .049 - Conditioning. - Page 3 Empty Re: Wen Mac .049 - Conditioning.

Post  KariFS Tue Apr 16, 2024 6:15 am

Here’s a thread about Aeromite:

https://www.coxengineforum.com/t10367-wen-mac-cox-s-early-competition

Indeed an early ready-to-fly plastic plane, probably very rare nowadays. I bet Bob (rsv) has at least one Wink A bit special with the speed-racer looks and the later model even had a tricycle landing gear. Mauricio can re-create a slightly enlarged RC version easily, I’m sure Very Happy

MauricioB wrote:I'm looking at photos on the web, it seems common to have a brand registration on the cylinder in these engines, above the number .049 (I indicate it in the photo with arrows)...so I wonder:
1) Will these marks be from some original acceleration control device?
either
2) Will they be factory machining marks??? and no acceleration device originally goes there?!....who knows?

Wen Mac .049 - Conditioning. - Page 3 Web310

appointment:
https://pocatellomarket.com/products/wen-mac-mk-ii-049-model-plane-engine-gas

I think those markings are from the machining process. The case is cast, and the cylinder mating surface and mounting thread need to be machined. The outside surface may be for mounting and/or locating the part for correct machining of the thread, or milling/drilling of another machined feature.

Or it could be made just to separate the intake pipe from the cylinder base, but I don’t really think so Huh...

Very nice work on the engine, Mauricio!
KariFS
KariFS
Diamond Member
Diamond Member

Posts : 2006
Join date : 2014-10-10
Age : 52

Back to top Go down

Wen Mac .049 - Conditioning. - Page 3 Empty Re: Wen Mac .049 - Conditioning.

Post  GallopingGhostler Tue Apr 16, 2024 7:21 am

Mauricio, hay una razón que la eficiencia ha aumentado en el venturi del «carburador». La respuesta puede encontrar en la dinámica de fluidos.
Mauricio, there is a reason that the efficieny has increased in the venturi of the "carburetor". The answer can be found in fluid dynamics.

Por ejemplo, vea a este enlace:
For example, see this link:
https://lopezva.files.wordpress.com/2012/02/flujo_tuberias_cap_3_y_4.pdf , las Páginas 25 a 26.

Wen Mac .049 - Conditioning. - Page 3 2024-017

y https://neutrium.net/fluid-flow/pressure-loss-from-pipe-entrances-and-exits/ en inglés. (in English)
Wen Mac .049 - Conditioning. - Page 3 2024-018

Por simplicidad, use esta entrada de borde quadrado para la condición inicial.
For simplicity, use Flush/Square-Edged entrance for the initial condition.

El factor K, el Coeficiente de resistencia es 0.5 .
The K-factor, Resistance Coefficient is 0.5 .

Entonces redondeaste el borde interior de la entrada.
Then you rounded the inner edge of the entrance.

Suponiendo por ejemplo, r = 0.5 mm, D = 5.0 mm, r/d = 0.2, entonces K = 0.04 .
Supposing for example,  r = 0.5 mm, D = 5.0 mm, r/d = 0.2, entonces K = 0.04 .

La resistencia es mucho menos. Por lo tanto, la efficiencia de la entrada ha aumentado.
The resistance is much less. Thus, the efficiency of the entrance has increased.
GallopingGhostler
GallopingGhostler
Top Poster
Top Poster

2023 Supporter

Posts : 5356
Join date : 2013-07-13
Age : 70
Location : Clovis NM or NFL KC Chiefs

Back to top Go down

Wen Mac .049 - Conditioning. - Page 3 Empty Re: Wen Mac .049 - Conditioning.

Post  getback Tue Apr 16, 2024 7:44 am

I think the Medallion spray bar gave a better response that the one you made ( still worked good ) I have heard that the best pressure tap would bee on the side of CC tail / end fair/ and at Crank shaft not as good . The sleeve worked good for some extra RPMs Cool !
getback
getback
Top Poster
Top Poster

2022 Supporter

2023 Supporter

Posts : 10173
Join date : 2013-01-18
Age : 66
Location : julian , NC

Back to top Go down

Wen Mac .049 - Conditioning. - Page 3 Empty Re: Wen Mac .049 - Conditioning.

Post  MauricioB Thu Apr 18, 2024 12:21 pm

Friends, thank you for the valuable information!!, all extremely useful.
Kari, yes I agree, it is possible that the marks are a record of machining, which inspired my imagination to make the regulation ring....so great!
Jorge, very good information!!....then I started working again on the venturi, below are the processes!
Eric, dear friend, yes, the Medallion .049 spray bar seems to be what keeps the engine running most stable, so I'll leave that placed there.
Robert! and Juan... then I made a pressure peak, which you will see in the photos. You have to do test runs to see how it turns out.
I colored the regulation ring (cold peacock), just to add color.
The engine changed its appearance completely since its inception and it really now looks like a competitive engine, with less rough lines and more aesthetics, (at least in my eyes)....A customized Wen-Mac .049...I'll do it now fly God willing!
I am learning a lot thanks to you.

original venturi mouth:

Wen Mac .049 - Conditioning. - Page 3 20240445

Modification of the original venturi:


Wen Mac .049 - Conditioning. - Page 3 20240446

Wen Mac .049 - Conditioning. - Page 3 20240447

Manufacture of an internal insert respecting the original suction diameter:

Wen Mac .049 - Conditioning. - Page 3 20240448
Wen Mac .049 - Conditioning. - Page 3 20240449
Wen Mac .049 - Conditioning. - Page 3 20240450

Inserted and pasted:

Wen Mac .049 - Conditioning. - Page 3 20240451
Wen Mac .049 - Conditioning. - Page 3 20240452

Manufacture of pressure peak, if it is not better, I can remove it and place a round head threaded screw as a cap:

Wen Mac .049 - Conditioning. - Page 3 20240453
Wen Mac .049 - Conditioning. - Page 3 20240454
Wen Mac .049 - Conditioning. - Page 3 20240455
Wen Mac .049 - Conditioning. - Page 3 20240457
Wen Mac .049 - Conditioning. - Page 3 20240458

Finished!...time to test the result!....coming soon

Wen Mac .049 - Conditioning. - Page 3 20240459













MauricioB
MauricioB
Top Poster
Top Poster

Posts : 3595
Join date : 2016-02-16
Age : 53
Location : ARG

Back to top Go down

Wen Mac .049 - Conditioning. - Page 3 Empty Re: Wen Mac .049 - Conditioning.

Post  MauricioB Fri Apr 19, 2024 9:54 am

Well friends, so I did the start-up and the experience.

With pressure peak, (with pressurizer):
The engine floods, I almost completely close the needle and when the engine rotates it sends a lot of pressure to the tank and the engine floods, it cannot start.

Without pressure peak, (without pressurizer):
The engine runs perfect, the rpm increases. It reached a peak of 13950, therefore it improved with the reform of the venturi.
The engine no longer has an erratic running pattern, it has become much more stable in rpm, which suggests that the air flow is much more even, without great turbulence.
Wen Mac .049 - Conditioning. - Page 3 20240460
Wen Mac .049 - Conditioning. - Page 3 20240462
Wen Mac .049 - Conditioning. - Page 3 20240463
Wen Mac .049 - Conditioning. - Page 3 20240464
Wen Mac .049 - Conditioning. - Page 3 20240470
Wen Mac .049 - Conditioning. - Page 3 20240465


Conclusion:
Permanently remove the pressure peak and manufacture a specific plug for the engine plate, a piece with dedication so that it is truly part of the engine and not a simple threaded screw.
Wen Mac .049 - Conditioning. - Page 3 20240466
Wen Mac .049 - Conditioning. - Page 3 20240467
Wen Mac .049 - Conditioning. - Page 3 20240468
Wen Mac .049 - Conditioning. - Page 3 20240469

I reached the end then with the Wen-Mac .049, all the work has been very pleasant and this engine generated a special affection in me, since every modification was noticeably improving the performance of the engine itself.
It's time to go get a model airplane to test it in flight.
Here are now the Cox .049 r/c with silencer and the Wen-Mac .049 r/c, waiting for me to get to work on a plane they will share.
Wen Mac .049 - Conditioning. - Page 3 20240461
MauricioB
MauricioB
Top Poster
Top Poster

Posts : 3595
Join date : 2016-02-16
Age : 53
Location : ARG

Back to top Go down

Wen Mac .049 - Conditioning. - Page 3 Empty Re: Wen Mac .049 - Conditioning.

Post  roddie Fri Apr 19, 2024 10:54 am

Wen Mac .049 - Conditioning. - Page 3 20240415


Mauricio, Maybe you could make a wrench/tool (see my drawing below) to remove/install the engine's backplate?


Wen Mac .049 - Conditioning. - Page 3 Backpl10
roddie
roddie
Top Poster
Top Poster

Posts : 8341
Join date : 2013-07-17
Age : 64
Location : N. Smithfield, Rhode Island

http://www.stilburnin.com

Back to top Go down

Wen Mac .049 - Conditioning. - Page 3 Empty Re: Wen Mac .049 - Conditioning.

Post  MauricioB Fri Apr 19, 2024 11:39 am

roddie wrote:Wen Mac .049 - Conditioning. - Page 3 20240415


Mauricio, Maybe you could make a wrench/tool (see my drawing below) to remove/install the engine's backplate?


Wen Mac .049 - Conditioning. - Page 3 Backpl10

Roddie, to remove and install the rear plate I use a Cox wrench, it works very well!

Wen Mac .049 - Conditioning. - Page 3 20240471
MauricioB
MauricioB
Top Poster
Top Poster

Posts : 3595
Join date : 2016-02-16
Age : 53
Location : ARG

Back to top Go down

Wen Mac .049 - Conditioning. - Page 3 Empty Re: Wen Mac .049 - Conditioning.

Post  Sponsored content


Sponsored content


Back to top Go down

Page 3 of 3 Previous  1, 2, 3

Back to top


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