Tee Dee Performance Crank

Total engine run time from start up to empty tank was 6.03 mins on 1 oz 25% nitro.


With my google chrome this page starts it at 360 dpi and allows a reset up 720 / 60 fps HD

You may have to use the link to watch full screen 1080 / 60 fps HD
https://www.youtube.com/watch?v=j0Q0nFOCJtw

Stock TD .049 with Cox RC carb without the muffler 

APC 4.75 x 4
In the hand prior to launch 19,380 rpm / 73.48 mph theoretical
In the air the engine ran steady I was getting 21.4 to 23.3k depending on wind direction
In the air 81.06 to 88.3 mph theoretical

Congrats 1/2A Nut a great vid a a brute flight....way faster than mine in the pic I showed above your post..I will rebuild mine to have a narrower fuse/less drag...I may opt for 2 carbon tubes of 6mm diameter to attach the tail to the body instead of the curled plywood body.

Thank you!

I was surprised your fuselage cracked mine has hit the ground at full throttle a few times and many other tumbles, no firewall or fuselage damage not even a cracked glue joint it has proved to be very tough. I buy ply from Sig and Midwest. I used the same ply for the Lil Speedy as well with no problems. Where did yours crack?

Mine broke right behind the rear former (behind the wind) in a nose-dive landing. I have never had any issues with the firewall or any other locations.

The truth is I could not get 0,8mm thick plywood right away when I got obsessed with the idea of building it so I glued two shets of 0,4mm together and this was not equivalent with the 0,8mm.

Hi 1/2A  Nut,

This time the fuse cracked just in front of the tail section so I thought I will chop it off and rebuild the tail section. But I figure it may be too short at the end and compromise the contrallability of the plane even if I reset the center of gravity.


Maybe a bit larger stab and fin will balance the shorter tail as regards the controllability? My gut feeling it is not too far from something that still may fly..


What do you think, is it worth a try or I should rather go to a sports store and buy myself a baseball bat - to smash this fuse with it then -  to shape my next fuse on it instead of the snooker pole?

I moved the horizontal stab into posistion, note the arrows is the wing as far forward as possible?
This looks possible

Thanks for this, I will give it a try...(you have ruined the pattern of my carpet under the plane while relocating the horizontal stab...:-) )

Nice video.thanks for posting it.what size tank did you have to get that long of a flight?

I used a 1oz plastic tank = )

[quote

In the hand prior to launch 19,380 rpm / 73.48 mph theoretical
In the air the engine ran steady I was getting 21.4 to 23.3k depending on wind direction
In the air 81.06 to 88.3 mph theoretical[/quote]

I gather this must be a non-SPI TD fit for a muffler application as the ground rpm is less than 20k?

1/2A Nut wrote:I used a 1oz plastic tank = )

Thanks 1/2A Nut I would love to move the wing forward but the wing saddle cutout on the fuselage does not allow it.

[quote="1/2A Nut"]I moved the horizontal stab into posistion, note the arrows is the wing as far forward  as possible?
This looks possible


quote]

Had some time tonite to patch the tail parts together...looks kinda skortchy- stocky-sturdy.. I threw it testing in the bedroom and seems to fly well balanced...the full size mirror also survived.



Weather permitting I will re-maiden it tomorrow.

Too bad you cant move the wing forward a bit as it is more stumpy now = )

You could start on a better fuselage while flying this version then swap the wing and gear over to the new
fuselage when ready. The tail moment is still longer than a flying wing.

I took the Stumpy version and modified

Thanks my next one will follow the contour you drew. I have already problems to jam the battery and the 50ccm balloon tank plus the electronics inside the fuse so tapering the nose will not make life easier.

Yes depending on what size gear you have there may be restrictions.

For the 5ch Skorch:
I was able to place 3 servos, RX, switch, the bottom 1/3rd of the flap and aileron servos and battery behind the landing gear former. Basicly from the leading edge of the wing to 1/4in behind the trailing edge of the wing all gear was placed for the 5ch set up. This leaves only the 1oz fuel tank in front of the landing gear forming to the firewall.

The same layout for the 3ch Lil Speedy all gear was placed in the wing saddle area other than the 1/2 oz fuel tank.




The tank was pushed forward to make room for the RX.

Here is TD .15 plane I will be building for the spring weather flying this one is made to blast through windy days.
I will use a exhaust throttle sleeve  

I call it Slim V -  the rendering is full size if you have a PC to HDMI to a 32 or 42in LCD or LED tv to view.

Great, sleek contour, I like it. It wont be simple - at least it would not be for me - to move the pushrods to the aft to reach the control horns?

Do you have a blueprint to build the plane on, or you just follow your routine and gut-feelings?

BTW my shortened Skortch still flies nicely, but I have servo problems re--occuring. Vibrations may be a reason, I already glued rubber bands onto the wing saddle to stop them.

Just a rendering which is enough to do a box style fuselage and balsa blank wing with a spruce spar at the CG. Very simple build with ply sheet stock as the plane is very narrow for a TD 15 and needs the strength.

Good to hear yours is flying again!

I wonder if my landing gear help cancel vibrations? Although the APC props are very good and never cause vibrations. I have mounted a APC 4.5 x 4 to try next the 4.75 x 4 has been working very well just looking to amp up the rpm.


Full size and hand reference:

Last weekend I took the TD high performance crank and tested in a engine I call the Killer TD
I bought a 1995 Killer Bee engine from ebay mint never ran I took the lightweight piston and cylinder off the engine and put it on a TD frame with the high performance crank, aluminum carb body, cox RC carb, phenolic thrust washer, Doug Galbreath glow plug adapter head with a Nelson plug to finish off the Killer TD. I didn't bench test it rather I mounted in the Skorch and took it to the flying field. I ran one rich run and then a second run a bit rich but not as near as the first run this is the results and video for those who like cox engines and for those that use them in RC planes like myself.

On the ground in the hand with the 4.5 x 4 it snarled its way up to 22,044 rpm.
Best pass today 24.1K for a theoretical 91.3 mph.

The modified Killer TD shows promise, perhaps 1 more rich flight to baby in a good break in and it should be ready to lean out to its best potential. I may add crankcase pressure the SPI function is thirsty with the lower weight piston. I think it will do 25k ish with the 4.5 x 4

The video was done with a new 16 MP / 60 fps (frames per second) camera.
If you have a good graphics card you can set to play in full screen 1080P HD for best viewing.

Hey 1/2A Nut this was a great flight. I loved the sound of the Killer TD much more than the jetliner in the background.

I tached the engine with my smartphone and measured around 18k. Was this because of the rich NV setting?

At the end of the flight I thought it was lean when the engine run even slower but I agree it must have been a loose head...I also often experience loose heads after a 8-10 minutes flight on my TD051.

Unfortunately the Skorch I build with your help tends to generate some vibration mid-air and this keeps killing my servos. I have already glued rubber bands on the wing saddle but id did not help.

I need to look into it again or build a new fuselage. Until then I fly my Toucan.

Depending (when) you tach check the engine as it was running richer as the engine broke in
Right before luanch in the hand 19,056 first pass 21,300 rpm

During the 2nd break in run
22,048 rpm on first start up took a few starts prior to launch

Best pass 24.1K with the engine thus far on two recorded break in flights.

Here is the first break in run:




In the above vid seconds before luanch 21.4K rpm - and best 23.7k

Great!!! BTW I also calculated the theoretical speed, simply multiplying the rpm with the blade pitch, and obtained your value. But I guess this would only give meaningful result if air were not compressible, ...

Try this RC Pro calculator I like using it:


http://www.rcpro.org/rccalc/PitchSpeed.aspx