Re: R/C TD.010 plane

FIXR7 Fri Apr 06, 2012 9:38 pm

The factory must have done it because I bought it new.
Guess I just proved the factory did fit SPI sets to throttled engines?

dankar04 Fri Apr 06, 2012 9:57 pm

Nice neat little package.

FIXR7 Fri Apr 06, 2012 10:29 pm

Thanks dankar.

proctor Thu Apr 12, 2012 5:41 pm

I have a couple of questions on the throttle.
Your one looks like aluminium, while all the cox ones are steel, would
imagine steel would be best to avoid differential expansion problems and easier
to lap for fit.
Would you turn the inside diameter a few thou oversize for example
to allow the two halves, held together with circlip to be lapped to
match cylinder diameter.
Expect the throttle ring could be turned and finished inside and out, and
ports cut and trial fit of circlip before separating into two halves.
Sure would be good to have a drawing and a little procedure before
starting such a project.
John

FIXR7 Thu Apr 12, 2012 7:32 pm

Hi John,

It's stainless actually.
I described the basic construction in my first post but we didn't draw anything unfortunately which, has more to do with my machinist friend Tony who can do this stuff in his sleep.
I suppose I could measure and draw something now though.
We didn't lap the inside diameter to the cylinder, the I.D was bored to the correct size and hit with some emery cloth to deburr. We lapped the mating edges to each other to ensure the gap between was as tight as possible knowing that we only have a circlip holding it together and the inherrent vibration present.

I hope to give it a go soon anyway. I'm going to fit smaller radio gear to the model first because the stuff that's in there is pretty old(and relatively big and heavy) plus I'll use a LiPo RX battery to cut weight and increase capacity over the 110mah nicad pack I have in there now.

Pete.

**RknRusty** Thu Apr 12, 2012 8:37 pm

FIXR7 wrote:The factory must have done it because I bought it new.
Guess I just proved the factory did fit SPI sets to throttled engines?

Unless it came from the Estes era, they slapped any old parts on engines and sold them, and yours is apparently a Black Widow #1 cylinder. If it came from Cox that way, I have no explanation. But I'd rather have a #1 on my Medallion anyway. It has more power.

FIXR7 Thu Apr 12, 2012 9:22 pm

The medallion is an early 70's one.

**RknRusty** Thu Apr 12, 2012 10:11 pm

FIXR7 wrote:The medallion is an early 70's one.

Oh well, in that case, I stand corrected.

FIXR7 Fri Apr 13, 2012 3:51 am

Hey Rusty,
I'll check out my TD .09 and the .010 when i get a chance too.
When was the Estes Era? Mid 90's?
All of my engines were produced before then.
Maybe some more members can chime is with known NIB engines and their configuration?

Pete.

**RknRusty** Fri Apr 13, 2012 10:55 am

Some of the Cox history experts can answer about the Estes dates. Maybe someone knows how a Black Widow cylinder ended up on a Medallion. Or maybe I don't know what I'm talking about. I thought I did or I wouldn't be posting.

nitroairplane Fri Apr 13, 2012 6:36 pm

FIXR7 wrote:Hey Rusty,
I'll check out my TD .09 and the .010 when i get a chance too.
When was the Estes Era? Mid 90's?
All of my engines were produced before then.
Maybe some more members can chime is with known NIB engines and their configuration?

Pete.

Yup I believe Estes took over in 1996, hence only pre '96 Killer Bees and Black widows have any real value.

**RknRusty** Fri Apr 13, 2012 7:47 pm

nitroairplane wrote:Yup I believe Estes took over in 1996, hence only pre '96 Killer Bees and Black widows have any real value.

Nitro, what do you think of the #1 SPI cylinder and muffler on his early '70s .049 Medallion that he bought NIB?

nitroairplane Fri Apr 13, 2012 8:07 pm

RknRusty wrote:
nitroairplane wrote:Yup I believe Estes took over in 1996, hence only pre '96 Killer Bees and Black widows have any real value.
Nitro, what do you think of the #1 SPI cylinder and muffler on his early '70s .049 Medallion that he bought NIB?

Anomaly?
Are you sure you did not change it at any point?
It is odd to have SPI and and muffler from the factory although I am sure that all pee wees had about 0.015" SPI and they made mufflers for those.

FIXR7 Fri Apr 13, 2012 10:33 pm

It's got a throttle but no muffler.....and my memory ain't that bad.

nitroairplane Sat Apr 14, 2012 12:08 am

FIXR7 wrote:It's got a throttle but no muffler.....and my memory ain't that bad.

Oh ok, a throttle ring.
I did not know they made throttle rings to fit those because I thought they were milled an lapped to fit together.
Can we get a pic without the throttle ring?
Thanks
Indra

**RknRusty** Sat Apr 14, 2012 12:18 am

Oops, muffler/throttle ring, I was mixed up. Seems a similar problem though. Maybe not as severe since the throttle ring doesn't have a collection chamber.

nitroairplane Sat Apr 14, 2012 12:38 am

RknRusty wrote:Oops, muffler/throttle ring, I was mixed up. Seems a similar problem though. Maybe not as severe since the throttle ring doesn't have a collection chamber.

Well I mean with SPI the idle would be lower but potential less solid.

**Cribbs74** Sat Apr 14, 2012 8:26 am

RknRusty wrote:Oops, muffler/throttle ring, I was mixed up. Seems a similar problem though. Maybe not as severe since the throttle ring doesn't have a collection chamber.

I haven't noticed any difference in RPM with the rings on my TD's

Ok, enough ear tach. I guess it's time for me to buy one.

FIXR7 Sat Apr 14, 2012 8:15 pm

Here it is apart...

R/C TD.010 plane - Page 2 DSC05261

This is the 1...

R/C TD.010 plane - Page 2 DSC05259

Here's the TD 09 without it's muffler...

R/C TD.010 plane - Page 2 DSC05264

No SPI on this one..

R/C TD.010 plane - Page 2 DSC05263

nitroairplane Sat Apr 14, 2012 11:37 pm

FIXR7 wrote:Here it is apart...

This is the 1...

Here's the TD 09 without it's muffler...

No SPI on this one..

odd that is not where the 1 usually goes.

FIXR7 Sun Apr 15, 2012 5:57 am

The 1 is also in that place on the black widow too.

FIXR7 Tue Apr 24, 2012 8:10 pm

The R/C .020 just lobbed and has SPI too.

1/2A Nut Wed Apr 22, 2015 2:37 am

A while back I decided to remove the flange section on the cylinder to slip over a hand made throttle sleeve on one of my TD .010's 3rd Gen Sleeve Test, note I had the tach set for 3 blade so will have to divide by 3 and times by 2. Most of this was in the 4-6k range. Third gen as it takes just the right amount of filed in slits to restrict the exhaust well at idle.

1st flight 2nd and 3rd Cox TD .010 Lil Speedy
1st / 2nd and 3rd flights of a new design for the TD .010 used the same prop for each flight 3 x 2 prop(cut down 4x2). 3rd flight I do a Doppler pass for speed check 24,170 rpm 46 mph . 5.3oz 3ch plane with throttle sleeve. The test flight has me flying it rather high but do some low passes here there - you will need to set viewing at 480P full screen to see this lil 21in span plane zip about. It was windy so didn't get to play with low throttle.

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