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TeeDeeVooDoo- my current project

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Re: TeeDeeVooDoo- my current project

Post  balogh on Thu Feb 08, 2018 2:51 am

Thanks Brad. I also tached the HQ5030 prop in the setup shown below and found the TD049 R/C spinning it at 21.5k i.e. a massive 3k more than the COX black 5x4...I know the pitch is less but I did not expect such a development. Maybe apart from the 1inch less pitch the thinner airfoil and less prop weight both helped this static speed rise?

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Re: TeeDeeVooDoo- my current project

Post  balogh on Thu Feb 08, 2018 3:13 am

Great vid Brad ...just asking, do you strengthen the lead edge of the Nano III wing with a layer of CA glue or anything just in case you hit a strong weed when landing?

You mentioned I should think of the engine thrust a bit. Do you have any offsetting angle on the engine shaft relative to the CL of the Nano III fuse?

I did not set anything hoping the genuine design of the VooDoo will have incorporated whatever was needed. Plus, the silicone exhaust extender with its face area and weight both is expected to drag the plane a bit to the right no matter if there is no thrust offsetting angle...what do you think?
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Re: TeeDeeVooDoo- my current project

Post  MauricioB on Thu Feb 08, 2018 9:20 am

balogh wrote:


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

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Re: TeeDeeVooDoo- my current project

Post  1/2A Nut on Thu Feb 08, 2018 9:39 am

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.

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Re: TeeDeeVooDoo- my current project

Post  balogh on Thu Feb 08, 2018 11:13 am

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?
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Re: TeeDeeVooDoo- my current project

Post  1/2A Nut on Thu Feb 08, 2018 1:03 pm

4.5x4 when it comes to Cox props.
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Re: TeeDeeVooDoo- my current project

Post  balogh on Thu Feb 08, 2018 1:06 pm

Thanks Brad I will tach the 4.5x4
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Re: TeeDeeVooDoo- my current project

Post  balogh on Sun Feb 11, 2018 11:19 am

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...
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Re: TeeDeeVooDoo- my current project

Post  1/2A Nut on Sun Feb 11, 2018 7:55 pm

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!!!!! Beer Cheers Clapping

Small Cox Logo RC Plane Small Cox Logo
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Re: TeeDeeVooDoo- my current project

Post  balogh on Tue Feb 13, 2018 7:18 am

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...
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Re: TeeDeeVooDoo- my current project

Post  getback on Tue Feb 13, 2018 7:43 am

Yes congratulations on the maiden good to hear it fly's well / the cold weather dont take long to get it in gear when its time to go > RC Plane
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Re: TeeDeeVooDoo- my current project

Post  balogh on Tue Feb 13, 2018 7:46 am

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 ... lol!)
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Re: TeeDeeVooDoo- my current project

Post  rsv1cox on Tue Feb 13, 2018 9:25 am

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
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Re: TeeDeeVooDoo- my current project

Post  balogh on Tue Feb 13, 2018 10:05 am

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?
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Re: TeeDeeVooDoo- my current project

Post  1/2A Nut on Tue Feb 13, 2018 10:15 am

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.

Airplane

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Re: TeeDeeVooDoo- my current project

Post  rsv1cox on Tue Feb 13, 2018 12:27 pm

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
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Re: TeeDeeVooDoo- my current project

Post  balogh on Tue Feb 13, 2018 12:31 pm

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. Smile
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Re: TeeDeeVooDoo- my current project

Post  rsv1cox on Tue Feb 13, 2018 3:22 pm

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. Smile

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
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