TeeDeeVooDoo- my current project

balogh wrote:

He looks beautiful friend!
I would not place an escape chamber, I would leave it free and scream !!

Do not recommend that prop it is no good for IC use.

That blade type is not as good nor safe to use.
You can clearly see the other props are made
with more beef connecting to the prop hub.
The type with the speed tips is best.

Yes I have right engine thrust always on all projects. CL planes typically have more offset.  
Combat CL have a great amount of offset they are fast typically with no vertical stab.

As far as engine thrust, test fly the plane as is if you need to add right aileron trim
then consider sanding the back of the engine mount so it sets on the firewall with
some right thrust. You need 3 degrees for RC use.

Prop weight will always slow down the top end rpm I like the carbon blend props
they put out more rpm and strength.

The leading edge has a natural two layers of monokote for protection.

Mauricio,

thank you. I will probably abandon the exhasut muffler and the extension after I have made sure the hot castor and the nitro will really not have any impact on the coating of the plane.

Brad, thank you for the advice.

Here are some alternate props I could see used on the Voodoo..




The black COX props are 4,5x4 and 5x4...
The white is a Grish (USA) 5,5x4
The grey is an APC 6x3

Without modifications which one do you think would be the optimum?

4.5x4 when it comes to Cox props.

Thanks Brad I will tach the 4.5x4

Despite the cold weather here I could not resist any longer to maiden the VooDoo..My concerns were whether the engine mount was missing the  offsetting a few degrees to the right to balance the gyro effect, and, finding the proper prop size.

The plane flew beautifully, meaning it  does not need any engine mount offsetting, it flies as straight as any well balanced plane would do.

Not knowing up-front the engine mount offsetting need, and for general caution, I put the low-pitch HQ5030 prop on the engine for the maiden flight, and noted this prop is just not providing the thrust the VooDoo needs: the engine unloaded in the air at such a high speed I first thought it had lost the prop, while the speed of the plane was just "nothing exceptional"..After I landed I found the prop in good order, but given its thin airfoil I have reasons to believe it "re-pitches" itself when reaching a certain speed..(Just wonder how it then behaves if driven by an electric motor at 30+k rpm???)

By the time of this recognition I was virtually shivering from the cold wind at the field, and decided not to continue the maiden exercise with the next, better prop, but made it for home.

Next time I will use the COX 5x4 and 4,5x 4 props as Brad advised, and also the APC 4,7x 4,25 I recently bought. Real IC engine props not some electric quadcopter trash,  these COX props will hopefully generate the thrust the VooDoo needs.

Will keep CEF posted...

Lol not trash just the wrong drone prop is all, no airfoil on that flat plate type.
I did encouraged you not to use it lol surprised you did. My fastest plane
flies with a quality carbon / blend HQ drone prop at 148 mph with a .05 engine.
Far from trash. HQ carbon blend speed tip 4045 amazing results at 36k rpm.
My second fastest airplane at 144 mph flies with a APC 5.25x6.25E

The larger 33" span plane had no issues flying straight with no prop torque from
that flat airfoil drone prop. The Cox prop will torque it over some but should not
be too bad with a 4.5D more so with the 5D

I am happy to know it has flown congratulations!!!!!

Thanks Brad,

the HQ prop I used for the maiden for caution is just a simple nylon product with no carbon blend or whatsoever stiffening included...I will try this weekend - weather permitting - the 5x4 and 4,5x4 COX props, still hoping the torque from thicker props will not influence the straight flight too much, making the sanding of the engine mount necessary for a 3 degree offsetting. I will also try flying without the COX muffler and see how the ultimate engine power will fly the VooDoo...

Thankis, Eric,

weather forecasts talk about nationwide snowfalls for the rest of the week here (nationwide is an overstatement with the country being less than 200miles wide ... )

Little country, big city. Second largest in Europe I believe.

I have always been fascinated by Budapest, divided in two by the Danube. Buda on one side and Pest on the other. Beautiful city with a colorful history.

Bob

Thanks, Bob..with 2 million inhabitants Budapest the capital is not a small city but is certainly smaller than many in the rest of Europe, like Paris, London, Rome, etc...Have you ever visited here?

The Cox 4.5x4 with no muffler should get the job done the 5x4 will not put out
the rpm, but on a calm day the extra thrust would be good for loops etc. Yes hope
the larger plane is not effected by prop torque that way you can just enjoy speed
flying without needing any right aileron trim.

balogh wrote:Thanks, Bob..with 2 million inhabitants Budapest the capital is not a small city but is certainly smaller than many in the rest of Europe, like Paris, London, Rome, etc...Have you ever visited here?

Bucket list. My son retires this year and I would like to take one of those excursion cruises up the Danube. He has been all over Europe in the past and knows Germany and the rail systems.

Bob

Bob once in or near Budapest you should let me know and I will make sure you and yours will have some good time here...not just obligatory courtesy on my side, please take it seriously.

balogh wrote:Bob once in or near  Budapest you should let me know and I will make sure you and yours will have some good time here...not just obligatory courtesy on my side, please take it seriously.

Thanks for the gracious invitation. I would love to see all the models you have posted about here over the years.

My son loved Munich when he was there during Oktoberfest and skied in the Alps. Your just a short jaunt over from Vienna, another of my dream destinations. If I get there, you will be sure to see me.

Bob

1/2A Nut wrote:The Cox 4.5x4 with no muffler should get the job done the 5x4 will not put out
the rpm, but on a calm day the extra thrust would be good for loops etc. Yes hope
the larger plane is not effected by prop torque that way you can just enjoy speed
flying without needing any right aileron trim.

Spring arrived so quick here- minus 10ish a week ago with snow, and plus 17C today with sunshine - that I could test the final configuration of the TeeDeeVooDoo in the field today:



I added a Galbreath head with Nelson turbo plug and swapped  the COX 050 RC carb with a Tarno just to arrive at more stable rpm in the air..the COX RC gear did not work out well and I lost the idlescrew mid-air...too bad I like genuine COX stuff on my planes but you cannot have always what you want..the exhaust header helps keep the bird a bit less snotty in castor and given its 10mm bore it does not restrict the engine in addition to what the muffler already robs in rpm.


Man  this is a super fast plane at least probably the fastest I have ever flown including the Lil Roughneck that is some 3oz lighter.

We will have a long weekend next week with plenty of sunshine forecast and I just need to figure out why my Sony headcam is on strike before I make some vids.

Good to hear you where able to test fly it again.
Did your carb stop barrel have a spring on the set screw?
One trick I do when there is not enough spring load on anything
I stretch the spring out a bit to add more loading. You can order
another stop screw or tap it for a metric size perhaps 2mm.

What sort of rpm did you get out of that prop?

Yes I also prestress the springs but the thread in the aluminum carb body wears loose by vibration and after that even the prestressed spring does not help. I have a few Cox RC carbs disfunctional for this reason. Maybe a bit larger metric screw self-tapping a new thread in the carb may help.

The 5x4 prop static speed in this setup is 18.6k.

Finally, chilly weather and my Sony headcam both allowed me to shoot a few vids on the TeeDeeVooDoo. Here is a longer one:

Thanks Eric!

Beautiful as that model András goes, congratulations!
I see that it even has a lot of autonomy in planning, I like that plane!
Tell me how you feel it in your fingers, is it fast ?, meets your expectations ?, leaves you wanting to fly it again and again? ...