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
» GSCB meet this Sunday
by roddie Today at 3:48 pm

» Submarine ARA San Juan Lost in the sea ....
by Oldenginerod Today at 3:22 pm

» 1/2A Non-Contest Control Line Gathering
by xplaneguy Today at 3:14 pm

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

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

lookie what the mailman brought me!

Page 1 of 2 1, 2  Next

View previous topic View next topic Go down

lookie what the mailman brought me!

Post  rogermharris on Fri Jun 12, 2015 5:03 pm

finally! i have been trying to win one of these on ebay for quite a few weeks and finally didn't get snipped at the last second!!

now tell me what i need to know about tee dee's please... this is my first one and even came with the nifty stand but hope to get a plane built for it sooner than later.

ohh and how do you tell the difference between an .049 and a .051?

avatar
rogermharris
Platinum Member
Platinum Member

Posts : 503
Join date : 2015-03-17
Age : 54
Location : Long Branch, New Jersey

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  Cribbs74 on Fri Jun 12, 2015 5:09 pm

Roger,

Externally the one pictured looks like an .051. Since carb bodies can be swapped the real sign is a single groove around the lower piston skirt and a #5 stamped on the exhaust flat or cylinder face.
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: lookie what the mailman brought me!

Post  balogh on Fri Jun 12, 2015 5:27 pm

[quote="rogermharris"]finally!  i have been trying to win one of these on ebay for quite a few weeks and finally didn't get snipped at the last second!!

now tell me what i need to know about tee dee's please... quote]


The best engines of their class...I know many members here will protest, but this is my subjective opinion based on hundreds of hours flying TD051-s...
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: lookie what the mailman brought me!

Post  rogermharris on Fri Jun 12, 2015 5:40 pm

Cribbs74 wrote:Roger,

Externally the one pictured looks like an .051. Since carb bodies can be swapped the real sign is a single groove around the lower piston skirt and a #5 stamped on the exhaust flat or cylinder face.


thanks cribbs!

this grove and #5 Laughing Shocked Laughing
avatar
rogermharris
Platinum Member
Platinum Member

Posts : 503
Join date : 2015-03-17
Age : 54
Location : Long Branch, New Jersey

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  Cribbs74 on Fri Jun 12, 2015 5:59 pm

Yep, looks like an .051.

Now to answer yoir second question the TD series represented the best Cox had to offer in the rotary valve series.

The .051 was nothing more than a small bump in displacement to allow the user to compete in class A simply by bolting that engine on in place of an .049.

Performance wise there is not enough difference between the .049 and .051 TD to say one is better than the other.

The TD also does not pull fuel from a hard tank very well although, it can be done. Many opt to use pressure bladders on TD's to enhance the run.

Enjoy it.
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: lookie what the mailman brought me!

Post  balogh on Fri Jun 12, 2015 6:11 pm

Make ssure you avoid a lean run that often occurs with old needle valves that allow air bypassing the thread...pull a silicone tube over the needle valve
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: lookie what the mailman brought me!

Post  rogermharris on Fri Jun 12, 2015 6:50 pm

balogh wrote:Make ssure you avoid a lean run that often occurs with old needle valves that allow air bypassing the thread...pull a silicone tube over the needle valve

thanks! i have seen that done on bee's i will have to pick up some fuel line
avatar
rogermharris
Platinum Member
Platinum Member

Posts : 503
Join date : 2015-03-17
Age : 54
Location : Long Branch, New Jersey

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  rogermharris on Fri Jun 12, 2015 6:51 pm

Cribbs74 wrote:Yep, looks like an .051.

Now to answer yoir second question the TD series represented the best Cox had to offer in the rotary valve series.

The .051 was nothing more than a small bump in displacement to allow the user to compete in class A simply by bolting that engine on in place of an .049.

Performance wise there is not enough difference between the .049 and .051 TD to say one is better than the other.

The TD also does not pull fuel from a hard tank very well although, it can be done. Many opt to use pressure bladders on TD's to enhance the run.

Enjoy it.

thanks for the info!! guess i will look into a bladder once i'm ready to decide on a plane design for it
avatar
rogermharris
Platinum Member
Platinum Member

Posts : 503
Join date : 2015-03-17
Age : 54
Location : Long Branch, New Jersey

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  RknRusty on Fri Jun 12, 2015 7:03 pm

My sole TD .051 is my best Cox engine. It's bolted to my 9 ounce R,W,&B Baby Flight Streak and I fly it on 40' lines. A couple of people with pitch meters have it at about 22k rpm in the air with a MA 5.5x3 prop. It does have a bored venturi to accommodate the increased fuel flow from a bladder.

The nice thing about bladders is that you can't easily hurt it with a lean run. If it gets lean enough to sag, the fuel inflow outpaces the engine, flooding and cooling it and it, so recovers until it sags again. If you hear this surging, you know to just tweak it a click richer the next run. This self limiting ability improves with more nitro, as it refrigerates the crankcase more quickly.

Mine has a lot of flights on it and I bought it used, so it's wearing down on compression a bit. I think I'll feed it some of the new 35% nitro Glowplugboy ,98% castor fuel, so a little varnish might rejuvenate it. The only indication of low compression in flight is that it slows a bit during hard turns. I could use less prop. 5.5x3 is about the biggest traditional prop I'd use on a C/L Tee Dee. The exception being a 6x2 APC.

The thing about sprinkler venturis on suction is that one or two of the three sprinkler holes around the venturi usually gets most of the fuel flow while the other(s) cavitate. Pressure from whatever source eliminates that problem.
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
avatar
RknRusty
Moderator

Posts : 10436
Join date : 2011-08-10
Age : 61
Location : South Carolina, USA

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  stuntflyr on Fri Jun 12, 2015 7:07 pm

I flew 1/2A Proto and Proto Profile for years on Perfect and homemade hard tanks. They are really easy to start if one uses the right compression and fuel as well as a handy electric starter (which I never had until I started flying them again in the 90's with my oldest son). I start with 25-30% nitro and three to five thin head gaskets and creep down from there if more power is desired. The Cox competition 5x3 is a really good all around prop for it, used for years by all of the Stunt guys in the 70's that flew miniature 1/2A Stunt models of their full sized stunters, most with hard tanks, flying 250 sq in models weighing about 7 to 9 oz on .008 solids about 40 feet long.
Chris...
avatar
stuntflyr
Gold Member
Gold Member

Posts : 211
Join date : 2012-01-18
Age : 58
Location : Tucson, Arizona

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  RknRusty on Fri Jun 12, 2015 8:58 pm

Chris, that sounds like a fun sport. I wouldn't mind getting some sort of racing going with my Huntersville friends. 1/2A would make it easy and inexpensive. I've got a bunch of small mostly new Perfect tanks.

I'd never used tanks until recently, 2011 or so, and had bad luck with them as I didn't know all the little things about setting them up. I got coaxed into bladders before I went totally mad by RC Groups members and our own Fit90 Bob. He really got me kick started with a goody box bladder starter kit. Including the first Tee Dee I'd ever seen. It's the one that hauls my Li'l Satan now. I won the "Best Flight" Pilots' Choice award at 1/2A day with it last year.
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
avatar
RknRusty
Moderator

Posts : 10436
Join date : 2011-08-10
Age : 61
Location : South Carolina, USA

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  pkrankow on Fri Jun 12, 2015 9:21 pm

Good tanks are hard to get. Bladder is pretty easy, non-pressure comes from a bag of party balloons, and pressure from Texas Timers. I've about sworn off hard tanks.

Phil
avatar
pkrankow
Diamond Member
Diamond Member

Posts : 2914
Join date : 2012-10-02
Location : Ohio

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  rogermharris on Fri Jun 12, 2015 9:32 pm

Well I'm open to any and all possibilities for tanks or bladders and what sort of bird to build for it.
avatar
rogermharris
Platinum Member
Platinum Member

Posts : 503
Join date : 2015-03-17
Age : 54
Location : Long Branch, New Jersey

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  Cribbs74 on Fri Jun 12, 2015 9:38 pm

rogermharris wrote:Well I'm open to any and all possibilities for tanks or bladders and what sort of bird to build for it.

What kind of models do you like?

Whatever you build it's going to move it pretty quick.
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: lookie what the mailman brought me!

Post  rogermharris on Fri Jun 12, 2015 10:00 pm

Cribbs74 wrote:
rogermharris wrote:Well I'm open to any and all possibilities for tanks or bladders and what sort of bird to build for it.

What kind of models do you like?

Whatever you build it's going to move it pretty quick.

Something sporty. Maybee a full fuse mustang instead of a profile build...
avatar
rogermharris
Platinum Member
Platinum Member

Posts : 503
Join date : 2015-03-17
Age : 54
Location : Long Branch, New Jersey

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  1/2A Nut on Fri Jun 12, 2015 10:30 pm

For me I like to use the 1 oz plastic clunk tanks for RC flying.
TD's have had no trouble pulling in fuel with a RC carb or with a throttle sleeve.

For best needle settings for flying:
- warm up the engine level
- point the engine straight up and peak the needle  
- back off 1/8th to a 1/2 turn your ready to fly.
- if need be pinch the line stop the engine and top off the tank prior to flying.



Small Cox Logo
avatar
1/2A Nut
Diamond Member
Diamond Member

Posts : 1301
Join date : 2013-10-20
Age : 54
Location : Texas

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  stuntflyr on Fri Jun 12, 2015 10:38 pm

Bladders are fine too, I have used both. R/C tanks work well, a lot of Scale guys use them. I use them in Stunt a lot for bigger models, never tried with 1/2As though.
Chris...
avatar
stuntflyr
Gold Member
Gold Member

Posts : 211
Join date : 2012-01-18
Age : 58
Location : Tucson, Arizona

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  Cribbs74 on Fri Jun 12, 2015 11:28 pm

Roger,

RSM makes the Pinto. I have heard and read good things about it, but no one I know has built one. It is really just a scaled down Oriental. Anyway, it was built around a TD.
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: lookie what the mailman brought me!

Post  rogermharris on Sat Jun 13, 2015 6:53 am

Cribbs74 wrote:Roger,

RSM makes the Pinto. I have heard and read good things about it, but no one I know has built one. It is really just a scaled down Oriental. Anyway, it was built around a TD.

I Like It!! and someone here is building one!! maybee they will share the plans Very Happy
https://www.coxengineforum.com/t8163-homemade-fuel-tank
avatar
rogermharris
Platinum Member
Platinum Member

Posts : 503
Join date : 2015-03-17
Age : 54
Location : Long Branch, New Jersey

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  pkrankow on Sat Jun 13, 2015 8:15 am

rogermharris wrote:
Cribbs74 wrote:Roger,

RSM makes the Pinto. I have heard and read good things about it, but no one I know has built one. It is really just a scaled down Oriental. Anyway, it was built around a TD.

I Like It!! and someone here is building one!! maybee they will share the plans  Very Happy
https://www.coxengineforum.com/t8163-homemade-fuel-tank

Fuel tanks area easy. They take clean cutting and accurate folding of the metal, and clean surfaces for soldering. Building a wooden plug to form around is really better than forming in air, but it is up to you.

bottom of the page is an image file. Redraw it or poke it around in some image manipulating software or word processor (yes, kludgy)
http://www.aeromaniacs.com/Tips.html

There are other shapes that are even easier to form too. A number of my links are broken today Sad
Phil
avatar
pkrankow
Diamond Member
Diamond Member

Posts : 2914
Join date : 2012-10-02
Location : Ohio

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  getback on Sat Jun 13, 2015 8:53 am

Nice engine Roger , I have tried the bladder but not enough to get it down pat. as to install and fly there are some threads here in the search box that will bee of a lot of help Small Cox Logo here's a couple https://www.coxengineforum.com/search?search_keywords=bladders
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: lookie what the mailman brought me!

Post  Sig Skyray on Sat Jun 13, 2015 9:20 am

Nice Roger.
I just got my first Tee Dee too, an .049, last weekend.  Couldn't wait to crank it up, and man does that thing scream.  As Rusty put it, "I wanted to dive under my bench for cover".  I learned not to stand in the plane of the prop rotation !  My first test run the Tee Dee clocked 18,200 RPM!  Geez! That was with a 6x3 TD Cox prop.

I didn't see it mentioned in this thread yet... Rusty made a how to video on simple bladders and a follow up video of how to start and tune the engine.  A surgical tube bladder is surprisingly simple to install and as he said, once you try it you'll never go back to a tanked engine.

The videos are posted in a sticky in the Models and Modeling section.

Since I'm just getting back into the hobby myself, I'm parking the Tee Dee for awhile until I get my sea legs with my Baby Bees and new-used Golden Bee.  I just scored a couple Medallion .09's but they have not arrived yet and those are for some time down the road too.  Looking forward to runni9ng them on the stand though.

Greg
avatar
Sig Skyray
Gold Member
Gold Member

Posts : 222
Join date : 2015-04-02
Age : 56
Location : Lake Mary, FL

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  fredvon4 on Sat Jun 13, 2015 10:11 am

Congrats on the first TeeDee .051

Grab a TD piston and cylinder from Bernie in .049 if you want to preserve the very hard to find .051 set

Many Cox addicts, once they learn the TeeDee often find all their reed Coxs gathering dust

I might suggest a trip over to Texas Timers http://www.texastimers.com/

Look for the Tab on the left side for "Needle Valves" and order one or more:
Precision Cox NVA for TD 049/051. (Complete) Price: $15.00 ea.

Then explore his Bladder section for making up pressure tanks.... There are better materiel and fittings but hell you are already there and his stuff does work

For competition many of us use other bladder tubing

Rusty likes one way valve at rear of bladder for easy filling, some folks just tie a knot in the end

keep your eye out for a few other TeeDees the damned things are so addicting

Paul Gibeault has some for sale that are part of his stash of go fast speed racing experimenting
http://flyinglines.org/gibeault.ad.pdf



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: lookie what the mailman brought me!

Post  rogermharris on Sat Jun 13, 2015 1:45 pm

fredvon4 wrote:Congrats on the first TeeDee .051

Grab a TD piston and cylinder from Bernie in .049 if you want to preserve the very hard to find .051 set

Many Cox addicts, once they learn the TeeDee often find all their reed Coxs gathering dust

I might suggest a trip over to Texas Timers  http://www.texastimers.com/

Look for the Tab on the left side for "Needle Valves" and order one or more:
Precision Cox NVA for TD 049/051.  (Complete)               Price: $15.00 ea.

Then explore his Bladder section for making up pressure tanks.... There are better materiel and fittings but hell you are already there and his stuff does work

For competition many of us use other bladder tubing

Rusty likes one way valve at rear of bladder for easy filling, some folks just tie a knot in the end

keep your eye  out for a few other TeeDees the damned things are so addicting

Paul Gibeault has some for sale that are part of his stash of go fast speed racing experimenting
http://flyinglines.org/gibeault.ad.pdf




thanks Fred! good info. sounds like a plan to order up an .049 top end. i will check the other sites out as time permits. i love my reed valve engines! i only ran a couple larger non cox engines as a kid and enjoy 1/2A. i'm looking forward to playing with my first and hopefully not my last tee dee. go to get them at the right price which for me is as close to zero as possible. from what i can see a was lucky to get this one at $30 Laughing Laughing
avatar
rogermharris
Platinum Member
Platinum Member

Posts : 503
Join date : 2015-03-17
Age : 54
Location : Long Branch, New Jersey

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  rogermharris on Sat Jun 13, 2015 1:53 pm

Sig Skyray wrote:Nice Roger.
I just got my first Tee Dee too, an .049, last weekend.  Couldn't wait to crank it up, and man does that thing scream.  As Rusty put it, "I wanted to dive under my bench for cover".  I learned not to stand in the plane of the prop rotation !  My first test run the Tee Dee clocked 18,200 RPM!  Geez! That was with a 6x3 TD Cox prop.

I didn't see it mentioned in this thread yet... Rusty made a how to video on simple bladders and a follow up video of how to start and tune the engine.  A surgical tube bladder is surprisingly simple to install and as he said, once you try it you'll never go back to a tanked engine.

The videos are posted in a sticky in the Models and Modeling section.

Since I'm just getting back into the hobby myself, I'm parking the Tee Dee for awhile until I get my sea legs with my Baby Bees and new-used Golden Bee.  I just scored a couple Medallion .09's but they have not arrived yet and those are for some time down the road too.  Looking forward to runni9ng them on the stand though.

Greg

thanks greg!

i have actually watched Rusty's videos already. well done rusty! don't know what way i will try first once i get something built for the tee dee. this too will most likeky be a fall winter project. i have a my original golden bee and black widow that i bought back in 73-74 to build planes for. i think the golden bee may end up on my stunt trainer and the black widow back on a babee ringmaster with flaps. that is where it lived all those years ago.
avatar
rogermharris
Platinum Member
Platinum Member

Posts : 503
Join date : 2015-03-17
Age : 54
Location : Long Branch, New Jersey

View user profile

Back to top Go down

Re: lookie what the mailman brought me!

Post  Sponsored content


Sponsored content


Back to top Go down

Page 1 of 2 1, 2  Next

View previous topic View next topic Back to top

- Similar topics

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