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

Logged in members see NO ADVERTISEMENTS!


Understanding the Wen Mac recoil spring starting system Cox_ba12




Understanding the Wen Mac recoil spring starting system Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» Choke Tube "stuff"...
by Cox International Today at 10:12 pm

» [solved]most Efficent Glowhead Clip for Norvel Engine
by F4D Phantom II Today at 9:12 pm

» Revivng Some Childhood Classics
by GTO455 Today at 8:15 pm

» Jim Walker Firebaby
by rdw777 Today at 1:26 pm

» Reliving my childhood with a very rare and totally undesirable yellow head Babe Bee
by rsv1cox Today at 12:31 pm

» Project Cox .049 r/c & Citabrian Champion
by MauricioB Today at 12:31 pm

» Micro Draco Gets to Fly on a Beautiful Morning.
by rdw777 Today at 10:43 am

» K&B greenhead Torpedo 19/23 prop driver
by ffkiwi Today at 6:16 am

» Mounting screws for horseshoe backplate
by KariFS Today at 12:12 am

» So to the rescue of an EZ BEE .049 r/c
by MauricioB Yesterday at 10:20 pm

» Making a water-cooling coil for a Cox .049 engine
by 1/2A Nut Yesterday at 9:27 pm

» Cox powered jet-pump for model Sprint Boat
by roddie Yesterday at 8:45 pm

Cox Engine of The Month
April-2024
OVERLORD's

"Kress ducted fan with new Cox Conquest 15 RC"



PAST WINNERS
CEF Traveling Engine

Win This Engine!
Gallery


Understanding the Wen Mac recoil spring starting system Empty
Live on Patrol


Understanding the Wen Mac recoil spring starting system

Go down

Understanding the Wen Mac recoil spring starting system Empty Understanding the Wen Mac recoil spring starting system

Post  rsv1cox Thu Apr 16, 2015 4:11 pm

Perhaps more for the newbys than the seasoned old pros here.  

I recently added six more various Wen Mac engines to my already extensive stash and decided to dismantle three of them completely.  All were locked up with old castor.  Popped all three in the toaster oven at about 250 degrees for 10 minutes.  Removed using a leather glove, added a wooden prop and all three loosened like magic.

One would wind against the spring and recoil but would not operate in a proper counter clockwise direction.  Using a couple of screwdrivers on opposite sides I pried off the forward drive plate exposing the cam and the spring.  Max gunk, cleaned that up and reassembled.  Still no counter clockwise function.  

Understanding the Wen Mac recoil spring starting system Wen%20Mac%20engine%20009_zpspy5c9lu4

Looking closer at the forward drive plate I noticed that it is actually a sandwich affair with a paul of some sort between the two outer pieces.  Hmmm, I thought it was a plunge and release mechanism, but it's actually a slip ring affair.  

Understanding the Wen Mac recoil spring starting system Wen%20Mac%20engine%20010_zpsd1lwzvkb

I heated the plate, soaked with Rem oil and finally worked it loose with a whole lot of gunk being expelled from inside the plate.

Put everything back together, added a prop and it works like new.
rsv1cox
rsv1cox
Top Poster
Top Poster

2022 Supporter

2023 Supporter

2024 Supporter

Posts : 10544
Join date : 2014-08-18
Location : West Virginia

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  Oldenginerod Thu Apr 16, 2015 4:25 pm

You need to be real careful when removing these that you don't dent the inner plate on the clutch mechanism, or it will lock and refuse to free-wheel, even with a small dent. Also when assembling, be sure to line the pawls up with the cam to which the spring attaches.
Oldenginerod
Oldenginerod
Top Poster
Top Poster

Posts : 3969
Join date : 2012-06-15
Age : 61
Location : Drouin, Victoria

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  rsv1cox Thu Apr 16, 2015 5:12 pm

I can see how that could happen Rod. I wasn't particularly careful when removing the outer plate thinking it solid and got lucky. I would like to make a couple of hardwood wedges to use in the future.

I found that if I were careful I could feel the pawls align with the cam before using the prop and drive nut to seat the assembly.

I hope that you received my PM regarding your Mom.
rsv1cox
rsv1cox
Top Poster
Top Poster

2022 Supporter

2023 Supporter

2024 Supporter

Posts : 10544
Join date : 2014-08-18
Location : West Virginia

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  chevyiron420 Thu Apr 16, 2015 5:34 pm

I have two or three of those models with the V on the side and they run pretty good, about like a Babe Bee single port. I dont use them for much, but There neet. My wife has one on a little wizzard.
Phil
chevyiron420
chevyiron420
Gold Member
Gold Member

Posts : 251
Join date : 2015-01-28
Age : 66
Location : Barney Georgia

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  RknRusty Thu Apr 16, 2015 6:34 pm

Thanks for showing us. I've never known what was in there.
Rusty

_________________
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
Rest In Peace
Rest In Peace

Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  NEW222 Thu Apr 16, 2015 9:40 pm

Thank you. I had acquired one of these, but had never known what the big black discs in front were or what they were for. I will now go and try mine out to see how it works. Should I just wind the prop clockwise from the front a turn and see if it goes? Thank you.
NEW222
NEW222
Top Poster
Top Poster

Posts : 3892
Join date : 2011-08-13
Age : 45
Location : oakbank, mb

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  rsv1cox Fri Apr 17, 2015 6:53 am

It takes a couple of turns clockwise to wind the spring, it will stop when fully wound.  Watch out when you release, the prop has a nasty way of finding a finger.

IMO Wen Mac's system beats the Cox afterthought spring.  There is no engagement to worry about, just wind and let go.
rsv1cox
rsv1cox
Top Poster
Top Poster

2022 Supporter

2023 Supporter

2024 Supporter

Posts : 10544
Join date : 2014-08-18
Location : West Virginia

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  Oldenginerod Fri Apr 17, 2015 7:08 am

Well Cox did introduce a similar wind back starter, but they were taken to court over it and forced to remove it from sale, I believe. The wind-back version has become rather valuable from a collectors perspective.
The earlier Wen Mac starters with the rivited spring were fairly reliable, but the later Testors ones changed to a hook end on the spring and they were very fragile. They are truely "no-drag" starters because the pawls disengage with centrifugal force so there is virtually no friction at all. But they are probably a little heavy, with quite a bit of spinning weight in the clutch.

Rod.
Oldenginerod
Oldenginerod
Top Poster
Top Poster

Posts : 3969
Join date : 2012-06-15
Age : 61
Location : Drouin, Victoria

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  Oldenginerod Fri Apr 17, 2015 7:12 am

Understanding the Wen Mac recoil spring starting system Windba10
Oldenginerod
Oldenginerod
Top Poster
Top Poster

Posts : 3969
Join date : 2012-06-15
Age : 61
Location : Drouin, Victoria

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  NEW222 Fri Apr 17, 2015 7:37 am

Thanks for the help and advice. I carefully used a screwdriver and separated the two halves only to find out that the spring is broken at the rivet near the shaft side. So no more worrying about how it works for me, as it doesn't.
NEW222
NEW222
Top Poster
Top Poster

Posts : 3892
Join date : 2011-08-13
Age : 45
Location : oakbank, mb

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  Mark Boesen Fri Apr 17, 2015 2:59 pm

Oldenginerod wrote:Well Cox did introduce a similar wind back starter, but they were taken to court over it and forced to remove it from sale, I believe.  The wind-back version has become rather valuable from a collectors perspective.
The earlier Wen Mac starters with the rivited spring were fairly reliable, but the later Testors ones changed to a hook end on the spring and they were very fragile.  They are truely "no-drag" starters because the pawls disengage with centrifugal force so there is virtually no friction at all.  But they are probably a little heavy, with quite a bit of spinning weight in the clutch.

Rod.

Rod,

I don't think it ever went to court, they were likely sent a cease and desist from Testor's attorneys. Cox stopped production sometime in '72 and scrapped the remainder of starters.
Mark Boesen
Mark Boesen
Top Poster
Top Poster

Posts : 3976
Join date : 2011-09-01
Age : 65
Location : Rockford, Il

http://groups.yahoo.com/group/049Collectors/

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  NEW222 Fri Apr 17, 2015 4:49 pm

Ok, now since my spring is broken on my starter, is there any way to remove the assembly from the engine as it is dead weight, or should I leave the starter assembly on anyways. Also, could someone please tell me as to what size prop is best suited for a MK III .049 engine, as well as what to drill the prop hole to. Thank you.
NEW222
NEW222
Top Poster
Top Poster

Posts : 3892
Join date : 2011-08-13
Age : 45
Location : oakbank, mb

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  chevyiron420 Fri Apr 17, 2015 6:31 pm

My experience with the early types of wen macs is limited, but here is what I have found. The performance of these engines varies from engine to engine. I would experiment with 5x3-5x4, then 5 1/2x3-5 1/2x4 props, and drill to .161-.166.
If the spring is broke you can rob one from a pipe bomb. Even though the starter housing is smaller on the bomb, they work for me. If you decide to run it as is it is a good idea to remove the prop drive and remove the sleeve under there. You dont want it spinning around on the nose of the crankcase. Also I have found these engines to be sensitive to glow plugs. I have had them go from barley running to good performance and everywhere in between just by plug changes.
Phil
chevyiron420
chevyiron420
Gold Member
Gold Member

Posts : 251
Join date : 2015-01-28
Age : 66
Location : Barney Georgia

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  Nhschreiner Sun Mar 10, 2024 1:41 pm

I just now ran across this discussion. I have both a Wen-Mac and a Testers/McCoy .049. I recently saw a heavily use Wen-Mac in eBay and purchased it for the recoil winder. After careful examination of my two engines I guessed the Wen-Mac winder would fit the Testers/McCoy. After removing and cleaning all the gunk out of the winder I installed the Wen-Mac winder on the McCoy. Perfect fit! Thanks guys for the disassembly information. My McCoy lives to fly another day😂🛫
Nhschreiner
Nhschreiner
New Member
New Member

Posts : 3
Join date : 2022-07-05
Age : 69
Location : Manchester, NH

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  rsv1cox Sun Mar 10, 2024 3:06 pm

Nhschreiner wrote:I just now ran across this discussion. I have both a Wen-Mac and a Testers/McCoy .049. I recently saw a heavily use Wen-Mac in eBay and purchased it for the recoil winder. After careful examination of my two engines I guessed the Wen-Mac winder would fit the Testers/McCoy. After removing and cleaning all the gunk out of the winder I installed the Wen-Mac winder on the McCoy. Perfect fit! Thanks guys for the disassembly information. My McCoy lives to fly another day😂🛫

Ah, Manchester NH, the Queen city. I was born and raised in Raymond, some 18 miles to your East. I was in high school when you were born. I spent a lot of time in Manchester.

I'm glad that you gave this thread new life, I contributed (above) but lost sight of it. I did not know that Rod had posted a picture of the Cox version. Saved it to my files. I must say that the Wen Mac/Testors version is the better of the two. Internal coil/watch spring makes a big difference in function, appearance, and ease of cleaning. I always flush mine out with RemOil/compressed air after each run. Cylinder also.

Welcome to the forum.
rsv1cox
rsv1cox
Top Poster
Top Poster

2022 Supporter

2023 Supporter

2024 Supporter

Posts : 10544
Join date : 2014-08-18
Location : West Virginia

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  F4D Phantom II Wed Mar 13, 2024 10:23 pm

rsv1cox wrote:Perhaps more for the newbys than the seasoned old pros here.  

I recently added six more various Wen Mac engines to my already extensive stash and decided to dismantle three of them completely.  All were locked up with old castor.  Popped all three in the toaster oven at about 250 degrees for 10 minutes.  Removed using a leather glove, added a wooden prop and all three loosened like magic.

One would wind against the spring and recoil but would not operate in a proper counter clockwise direction.  Using a couple of screwdrivers on opposite sides I pried off the forward drive plate exposing the cam and the spring.  Max gunk, cleaned that up and reassembled.  Still no counter clockwise function.  

Understanding the Wen Mac recoil spring starting system Wen%20Mac%20engine%20009_zpspy5c9lu4

Looking closer at the forward drive plate I noticed that it is actually a sandwich affair with a paul of some sort between the two outer pieces.  Hmmm, I thought it was a plunge and release mechanism, but it's actually a slip ring affair.  

Understanding the Wen Mac recoil spring starting system Wen%20Mac%20engine%20010_zpsd1lwzvkb

I heated the plate, soaked with Rem oil and finally worked it loose with a whole lot of gunk being expelled from inside the plate.

Put everything back together, added a prop and it works like new.


Hello rsv1cox
                       I have a wen mac that had the starter spring broken. I took the unit out and pressed a cox .049 prop drive washer and it has worked for me. I did this a while back I think I used a plastic prop to press the washer in on the crank using a flat washer and a nut. here are a couple of pics.
                                                                         juan
Understanding the Wen Mac recoil spring starting system Img_7015
Understanding the Wen Mac recoil spring starting system Img_7014
F4D Phantom II
F4D Phantom II
Gold Member
Gold Member

Posts : 166
Join date : 2019-04-08

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  rsv1cox Thu Mar 14, 2024 2:45 pm

Hi Juan, Good idea and a great fix.  Saved an engine.  I'm going to start running the Wens and Testors again.  

BTW, I no longer use a toaster oven, a heat gun works so much better. April 16th, 2015, nine years how time flys.
rsv1cox
rsv1cox
Top Poster
Top Poster

2022 Supporter

2023 Supporter

2024 Supporter

Posts : 10544
Join date : 2014-08-18
Location : West Virginia

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

Post  NEW222 Thu Mar 14, 2024 4:05 pm

What a great and neat idea. I too have one with a broken spring starter and just left it as I did not know of any other options. Looks like I will have to add a drive washer to an order when I have to make another order from Coxinternational, but unfortunately that will not be for a while. But on the bright side, it still does run with the hub there.
NEW222
NEW222
Top Poster
Top Poster

Posts : 3892
Join date : 2011-08-13
Age : 45
Location : oakbank, mb

Back to top Go down

Understanding the Wen Mac recoil spring starting system Empty Re: Understanding the Wen Mac recoil spring starting system

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