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

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

"Flirting With Pressure"...my first bladder runs.

View previous topic View next topic Go down

"Flirting With Pressure"...my first bladder runs.

Post  Kim on Mon Dec 22, 2014 9:33 am

So, traded a couple emails with Mark (rat9000), and had him ask me if I'd gotten around to trying pressure bladders (which I hadn't).  It's a truly crummy day here in SE Missouri, and so I broke out the kit I'd gotten a couple months ago.

After what I'm sure were standard beginner mistakes...fuel line pops off, hosing me with the volatile juice...a couple of "Super Floods" in the Tee Dee before I got the needle valve cranked down.

Once I got the combo going though, the Tee Dee walked right up to 20,000 rpm and stayed there...on 15% Sig (I was too lazy to retrieve some 35% from the house).

So now, I may give it a try on my little sheet-balsa Rivets, and send some time-warps back at Rusty!









A good morning going now, so guess I'm up to heading into Tailwinds to deal with some wild-eyed holiday shoppers !!!

avatar
Kim
Top Poster
Top Poster

I Support My Forum

Posts : 5716
Join date : 2011-09-06
Location : South East Missouri

View user profile

Back to top Go down

Re: "Flirting With Pressure"...my first bladder runs.

Post  roddie on Mon Dec 22, 2014 10:04 am

Congrats Kim!! Thumbs Up This is something I need to do eventually.
avatar
roddie
Top Poster
Top Poster

Posts : 5462
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: "Flirting With Pressure"...my first bladder runs.

Post  Kim on Mon Dec 22, 2014 10:09 am

WEAR SAFETY GLASSES/GOGGLES !!!
avatar
Kim
Top Poster
Top Poster

I Support My Forum

Posts : 5716
Join date : 2011-09-06
Location : South East Missouri

View user profile

Back to top Go down

Re: "Flirting With Pressure"...my first bladder runs.

Post  balogh on Mon Dec 22, 2014 10:11 am

Try this super-sophisticated solution I use on the short fuel nipples on my TeeDee-s. It only takes a bit larger dia silicone tube pulled over the fuel line end over the nipple, and acts like a press-sleeve.

Do not even fly without it or similar otherwise (as I sometimes experienced) you may bump into a lean run and your beautiful 1st generation very rare TD049 (with no screeen on the air intake, and thin wall cylinder) and oil hole on the bottom end of the conrod is endangered.



I add a similar silicone tube to the NV to seal it against unwanted air-ingress by-passing the NV threads. With these simple add-ons I have never had any engine failure with TD-s for some years now.

With a pressure bladder, tough you are in fact only risking the in-flight detachment of the fuel line from the nipple and an instant engine stall.
avatar
balogh
Diamond Member
Diamond Member

Posts : 1523
Join date : 2011-11-06
Age : 59
Location : Budapest, Hungary

View user profile

Back to top Go down

Re: "Flirting With Pressure"...my first bladder runs.

Post  getback on Mon Dec 22, 2014 10:45 am

Good Deal there (Santa) when I tried it using air pressure to stretch (train) the bladder , well pop the first then blew the second across the yard somewhere It and that valentine spinner that went in to orbit when the rod broke on an older TD Mad is probably together laughing at my crazy self Smile I have not got the routine down yet !! Eric Lighting The Tree
avatar
getback
Top Poster
Top Poster

Posts : 4272
Join date : 2013-01-18
Age : 60
Location : julian, n.c.

View user profile

Back to top Go down

Re: "Flirting With Pressure"...my first bladder runs.

Post  roddie on Mon Dec 22, 2014 3:19 pm

I'd like to invest in the tiny fill-valve that Rusty uses. He fills the bladder (once trained) from the rear. This seems like a key element for simplicity.. and all of your plumbing joints forward, stay tight and clean.. because they don't get disconnected and re-connected repeatedly.
avatar
roddie
Top Poster
Top Poster

Posts : 5462
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: "Flirting With Pressure"...my first bladder runs.

Post  Ken Cook on Mon Dec 22, 2014 3:46 pm

Use black latex tubing and the more you use it and the wetter it gets, the harder it is to remove. Plus you can easily pinch it off with your fingers. Ken
avatar
Ken Cook
Diamond Member
Diamond Member

Posts : 2819
Join date : 2012-03-27
Location : pennsylvania

View user profile

Back to top Go down

Re: "Flirting With Pressure"...my first bladder runs.

Post  Kim on Mon Dec 22, 2014 4:23 pm

roddie wrote:I'd like to invest in the tiny fill-valve that Rusty uses. He fills the bladder (once trained) from the rear. This seems like a key element for simplicity.. and all of your plumbing joints forward, stay tight and clean.. because they don't get disconnected and re-connected repeatedly.

Got a couple of those, and that's next on the list to be tested!
avatar
Kim
Top Poster
Top Poster

I Support My Forum

Posts : 5716
Join date : 2011-09-06
Location : South East Missouri

View user profile

Back to top Go down

Re: "Flirting With Pressure"...my first bladder runs.

Post  Kim on Mon Dec 22, 2014 4:35 pm

Ken Cook wrote:           Use black latex tubing and the more you use it and the wetter it gets, the harder it is to remove. Plus you can easily pinch it off with your fingers. Ken

Hey Ken,

Is this the tubing for the bladder itself, or another type for running it to the engine?
avatar
Kim
Top Poster
Top Poster

I Support My Forum

Posts : 5716
Join date : 2011-09-06
Location : South East Missouri

View user profile

Back to top Go down

Re: "Flirting With Pressure"...my first bladder runs.

Post  RknRusty on Mon Dec 22, 2014 4:54 pm

roddie wrote:I'd like to invest in the tiny fill-valve that Rusty uses. He fills the bladder (once trained) from the rear. This seems like a key element for simplicity.. and all of your plumbing joints forward, stay tight and clean.. because they don't get disconnected and re-connected repeatedly.
Those and the matching filters are made by Fourmost, about $5 each. With the check valve you can't evacuate the line and bladder before filling, but if you use the cone shaped pickup from Texas Timers it doesn't matter because it keeps the air bubble away from the pickup for the whole run right until the end. With that little cone, you can't get the bubble out even if you try.

_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!


My Hot Rock & Blues Playlist
avatar
RknRusty
Moderator

Posts : 10437
Join date : 2011-08-10
Age : 61
Location : South Carolina, USA

View user profile

Back to top Go down

Re: "Flirting With Pressure"...my first bladder runs.

Post  Ken Cook on Mon Dec 22, 2014 4:58 pm

Well, it can be used both ways. I use it exclusively from the bladder fittings to the engine. I use the same size tubing for TD's as well as larger engines. Larry Driskill designed his Litehawk for this type of design. The tubing from the engine was the bladder.
avatar
Ken Cook
Diamond Member
Diamond Member

Posts : 2819
Join date : 2012-03-27
Location : pennsylvania

View user profile

Back to top Go down

Re: "Flirting With Pressure"...my first bladder runs.

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