Cox Engines Forum
You are not logged in! Please login or register! Guests are limited to posting in the "General Questions (Guest Posting Allowed)" section only. Becoming a member is fast, easy and FREE!


Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» Looking for a New In Box PT-19 from the 80s-90s
by kaylejwm Today at 2:04 pm

» GSCB meet this Sunday
by Ken Cook Today at 1:21 pm

» Wen-Mac slotted glowhead
by roddie Today at 12:44 pm

» Recent engine acquisitions
by 1/2A Nut Today at 12:39 pm

» Happy Thanksgiving Friends
by Admin Today at 12:14 pm

» 1/2A Non-Contest Control Line Gathering
by roddie Today at 11:23 am

» The Breezy Hill Flyers "Black Fly-Day" Event !!!
by fit90 Today at 8:53 am

» Submarine ARA San Juan Lost in the sea ....
by akjgardner Today at 8:41 am

» Drill Press Question
by getback Today at 8:10 am

» *** Double SIGH ***
by Kim Today at 5:15 am

Cox Engine of The Month
November-2017
MauricioB's

"Cox Tee Dee .010"



PAST WINNERS
Speed Contest 2018
CEF Traveling Engine

Gallery


Win This Engine!
The Traveling Prop
World of Aviation

Cox .020TD spring starter :)

View previous topic View next topic Go down

Cox .020TD spring starter :)

Post  Surfer_kris on Fri Sep 01, 2017 3:46 pm

I'm struggling to start the .020TD engine without a springstarter and I had no spare spring for it...
I do have a few PeeWee springstarters lying around, so I though I would try to adapt one. The springs are a little too narrow for the TD and it is also very hard to have it catch the prop, especially on other props than the stock ones. Once the engine was running the spring would also vibrate terribly and this can potentially wear down the prop. So I spent some time with the lathe and made an "Auto-engage" spring starter for it Smile

I have used this technique on fully cowled engines in the past and it works really well, but this is the first time I tried it on a .020TD. So I just thought I would share a few images and a little video here, I hope you'll enjoy it and that you might get inspired to make something similar. Smile





avatar
Surfer_kris
Diamond Member
Diamond Member

Posts : 1384
Join date : 2010-11-20
Location : Sweden

View user profile

Back to top Go down

Re: Cox .020TD spring starter :)

Post  Cribbs74 on Fri Sep 01, 2017 4:28 pm

Good job! That's one of the better mods I have seen lately.

avatar
Cribbs74
Moderator

Trusted Seller
Posts : 9529
Join date : 2011-10-24
Age : 43
Location : Tuttle, OK

View user profile

Back to top Go down

Re: Cox .020TD spring starter :)

Post  roddie on Sat Sep 02, 2017 11:09 am

Very nice work Kris! What did you use to cut the angled-slot for the wire to engage?
avatar
roddie
Top Poster
Top Poster

Posts : 5451
Join date : 2013-07-17
Age : 57
Location : N. Smithfield, Rhode Island

View user profile http://www.stilburnin.com

Back to top Go down

Re: Cox .020TD spring starter :)

Post  fredvon4 on Sat Sep 02, 2017 12:02 pm

Neat adapter

I think I would try to reduce the spring turns some to get zero drag of the spring steel on the aluminum adapter and at least stop any wear, loss of rpm, and the chatter noise...
avatar
fredvon4
Diamond Member
Diamond Member

Trusted Seller
Posts : 2215
Join date : 2011-08-26
Age : 62
Location : Lampasas Texas

View user profile

Back to top Go down

Re: Cox .020TD spring starter :)

Post  Surfer_kris on Sat Sep 02, 2017 12:12 pm

I starter with a dremel cutting wheel at an angle, then finished it off with a round diamond bit in the dremel.

I have a similar one for the fully cowled Norvel .074 in my CG super super chipmunk. Works like a charm, and creates a big surprise at the field for those who are sceptical towards small engines. Smile




avatar
Surfer_kris
Diamond Member
Diamond Member

Posts : 1384
Join date : 2010-11-20
Location : Sweden

View user profile

Back to top Go down

Re: Cox .020TD spring starter :)

Post  Surfer_kris on Sat Sep 02, 2017 12:13 pm

fredvon4 wrote:Neat adapter

I think I would try to reduce the spring turns some to get zero drag of the spring steel on the aluminum adapter and at least stop any wear, loss of rpm, and the chatter noise...

It sounds like a much harder pressure on the spring in the video than it is in reality. After a few test runs today, the spring pressure is just enough to engage. The one I made for the Norvel has worked many years, there is no wear on the aluminium to speak of (it is also well lubed by oil from the engine front-end) and no additional noise either:

avatar
Surfer_kris
Diamond Member
Diamond Member

Posts : 1384
Join date : 2010-11-20
Location : Sweden

View user profile

Back to top Go down

Re: Cox .020TD spring starter :)

Post  fredvon4 on Sat Sep 02, 2017 1:09 pm

My thoughts were based on the second photo of the cox adapter where it looks like a lot of pressure and contact to the adapter... the Norvel one looks perfect

any way well done...now carve out 1000 copies for Cox and Norvels and have Bernie make you and offer for the lot you can not refuse....grin
avatar
fredvon4
Diamond Member
Diamond Member

Trusted Seller
Posts : 2215
Join date : 2011-08-26
Age : 62
Location : Lampasas Texas

View user profile

Back to top Go down

Re: Cox .020TD spring starter :)

Post  getback on Sun Sep 03, 2017 10:09 am

Nice Adapt. Kris , If i had a lathe i would want one or two for myself , Finding a collar to work with would bee somewhat hard to do . I like the Super Super CG Chipmunk !! Babe Bee .049 This Site Rocks!
avatar
getback
Top Poster
Top Poster

Posts : 4271
Join date : 2013-01-18
Age : 60
Location : julian, n.c.

View user profile

Back to top Go down

Re: Cox .020TD spring starter :)

Post  Tee Bee on Sat Sep 23, 2017 11:23 pm

That is fantastic work! The TD .020 starter springs are very hard to find these days and I only have a couple of them left. I've searched a lot on the web recently for some more. If these were available on the market, I'd definitely be in line for a few of them.
avatar
Tee Bee
Gold Member
Gold Member

Posts : 198
Join date : 2011-08-25
Location : Angleton, TX

View user profile

Back to top Go down

Re: Cox .020TD spring starter :)

Post  Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top

- Similar topics

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