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Post  TD ABUSER on Sat Nov 28, 2020 8:22 pm

This engine was a NIB ebay purchase
with a 4.2 x 4 APC on 25% nitro it runs at 22,700 in the hand
The plane is an attempt to build a low drag model in order to see what a Cox TD can do.
I am using a KK NVA and a latex fuel bladder.
Spektrum park flyer RX
2 cell 300 mah LIFE
2 HS65 servos
120 sq inch wing
11 ozs RTF
At 26,000 in the air I'm guessing the model is doing 95 mph at times.

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Post  Marleysky on Sat Nov 28, 2020 8:41 pm

That looks like fun! Pretty darn quick for a lightweight plane. You’re not afraid of losing signal on that park flyer receiver? Small Cox Logo
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Post  TD ABUSER on Sat Nov 28, 2020 10:02 pm

Marleysky wrote:That looks like fun!  Pretty darn quick for a lightweight plane. You’re not afraid of losing signal on that park flyer receiver?  Small Cox Logo
I keep the model within 300 feet of me, so far so good. I just want to get the model far enough away to record a "Speed Pass"..then turn around and repeat
It's pretty amazing how small and light the RXs are now.
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Post  davidll1984 on Sat Nov 28, 2020 11:24 pm

Y use nanolight reciver spectrum and never lost signal once y use on Difrent model new one use as3x except draw more curent than old one use 7.4 lipo very light direct in Reciver no bec used wit futaba servo s3114 the plane look powerful Thumbs Up and sound to
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Post  1/2A Nut on Sun Nov 29, 2020 2:10 am

Chucks plane best down wind pass by the camera 26,162 rpm / 99.1 mph pitch speed
Will have to use wav. scope to check doppler should be around 92 mph ish given the
clean airframe and down wind assist.


Spektrum AR410 4-Channel "Sport Receiver" SPMAR410

The RX is rated "Full Range" per Spektrum.
I have flow it about 70 yrds. out / has gone 149.7 mph PS / 143 mph doppler pass no glitches ever.

For Fun:
$200 prize for anyone that can hit 155 mph or better level flight doppler pass in front of the camera
posted on Youtube with a RC plane using 1 TD .049 -.051 stock timing showing start up toss and
flight with landing. Build thread / pics. RPM Gauge and Wav. Scope will be use to verify entry.
Reference this post to me and link to vid / build thread - offer good till I get too old to see / hear.

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Post  TD ABUSER on Sun Nov 29, 2020 6:32 pm

1/2A Nut wrote:

Spektrum AR410 4-Channel "Sport Receiver" SPMAR410

The RX is rated "Full Range" per Spektrum.

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That's good to know about the range limit.
The Park Flyer rating must be because the internal circuitry is not heavy enough to handle large servo current draw.
300 feet out is about time for me to turn a 2 foot span plane with a razor thin frontal view "back to base".
I'm flying at a house that was recently abandoned by the guy I bought the rusted out 1977 Datsun 280Z from. He has [had] what looks like 10 acres and there isn't a For Sale sign up yet. I drove by his house every day for 20 years and saw that 280Z parked in his apple orchard every day...and sinking lower into the mud every year.
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Post  1/2A Nut on Sun Nov 29, 2020 7:38 pm


Yes park size projects needing low weight / small size does not have
all the extra bells and whistles for streaming data back to the TX.

Did you finish the Z project, if so post a pic.

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Post  1/2A Nut on Mon Nov 30, 2020 7:10 am

Some data from Chucks flight:

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Post  balogh on Mon Nov 30, 2020 1:05 pm

TD ABUSER wrote:This engine was a NIB ebay purchase
with a 4.2 x 4 APC on 25% nitro it runs at 22,700 in the hand
The plane is an attempt to build a low drag model in order to see what a Cox TD can do.
I am using a KK NVA and a latex fuel bladder.
Spektrum park flyer RX
2 cell 300 mah LIFE
2 HS65 servos
120 sq inch wing
11 ozs RTF
At 26,000 in the air I'm guessing the model is doing 95 mph at times.


Similar to my VooDoo Pilon racer effort:



My TeeDee did not unload in the air so well thanks to an exhaust manifold I added to control goo spread on the fuselage. I had a COX 5x4 black prop and 20% nitro in the fuel.

The VooDoo is an FRP plane that was originally made for electric motors and the vibrations by the TeeDee049 conversion regularly killed the - otherwise shock-absorbed - servos, leading to unplanned landings. I have given up my efforts, it is a 200€ airframe that is just too expensive to experiment and replace every time the servos give up... Doh!
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Post  1/2A Nut on Mon Nov 30, 2020 5:04 pm

I would step up to these high torque Corona servos metal gear / bearings -with real isolation mounts.
These are tough enough to be used with a TD .15
Already tested with my screaming 50k rpm Picco outrigger hydro that bounces on the water quite a bit.


Corona DS-843MG 8.5g Digital High Torque Micro Servo 4.8Kg x 3 Sets

https://www.ebay.com/itm/Corona-DS-843MG-8-5g-Digital-High-Torque-Micro-Servo-4-8Kg-x-3-Sets/222810100406?hash=item33e08452b6:g:qJcAAOSwUg9aaaqS

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Post  balogh on Mon Nov 30, 2020 6:04 pm

Thank you for the advice, Brad, regarding the metal gear servos and vibration absorbing grommets.

In fact the aileron servos if the VooDoo pilon racer, which are the most vulnerable to vibration, are fixed in an uncommon way by gluing them to the down side of the wing inside the fuselage. Normal servo mounts that would connect through the rubber grommets inside the servo ears cannot be placed in lack of space.

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Therefore no matter how resilient the stock mounting ears and grommets of the servo are, it does not really matter. In fact even the glue between the servos and the wing skin often detached mid-air due to the vibration generated by the TeeDee049.

I am not saying there cannot be a lasting solution fashioned for this issue, but I have over-spent my budget by re-ordering this beautiful FRP plane after some unplanned re-kitting landings. Balsa fuselage and wings  seem to absorb engine vibrations much more efficiently than FRP, IMHO.
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Post  MauricioB on Mon Nov 30, 2020 6:56 pm

Andras, I've done this before and it really works.
You may find this type of restraint helpful:
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Post  balogh on Mon Nov 30, 2020 7:03 pm

Thank you Mauricio, great idea that I will check in my next build.

The Voodoo wing is a thin FRP skin with soft material inside. Whether the acrews will anchor the metal retaining brace needs to be checked. But thank you for the tip!
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Post  MauricioB on Mon Nov 30, 2020 7:15 pm

balogh wrote:Thank you Mauricio, great idea that I will check in my next build.

The Voodoo wing is a thin FRP skin with soft material inside. Whether the acrews will anchor the metal retaining brace needs to be checked. But thank you for the tip!

No problem for that, put through bolts, instead of holding a wrench as in the case of this photo, you will hold the servos.
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Post  TD ABUSER on Mon Nov 30, 2020 9:32 pm

balogh wrote:

My TeeDee did not unload in the air so well thanks to an exhaust manifold I added to control goo spread on the fuselage. I had a COX 5x4 black prop and 20% nitro in the fuel.

The VooDoo is an FRP plane that was originally made for electric motors and the vibrations by the TeeDee049 conversion regularly killed the - otherwise shock-absorbed - servos, leading to unplanned landings. I have given up my efforts, it is a 200€ airframe that is just too expensive to experiment and replace every time the servos give up... Doh!

Hello Balogh......HS 65 servos will not fail you. You can mount them in your plane with SHOE GOOP GLUE for some added isolation from vibration.
Your VOODOO is a very fast looking plane...!
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Post  balogh on Mon Nov 30, 2020 9:47 pm

Thank you Chuck. The TeeDeeVooDoo - as I renamed it - is a wonderful top notch quality airframe with excellent maneuverability..too bad the Graupner servos have let me down. Your tip on gluing the servos is also appreciated. Once I venture into this VooDoo experiment again, I will definitely use your and Mauricio's tips.

In terms of speedplanes the Quickie100 powered by stock red postage stamp backplate 190 reedies having Kamtechnik turbo heads are a matching alternative. Less prone to vibration despite the extreme engine speed near 28k, and equally fast.
See my maiden video..
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Post  TD ABUSER on Mon Nov 30, 2020 9:50 pm

1/2A Nut wrote:Some data from Chucks flight: 91 mph

:

Thanks for the Wavy Scope lines..!
I ran the plane with the 4.1 x 4.1 yesterday.
The engine seemed to like it...I would say it was revving higher than the 4.2 x 4
Upon launch the plane veered right, bumped the 20,000 volt power line and bounced back into a normal flight pattern like nothing happened.
The plane seemed slower than with the 4.2 x 4 prop
Towards the end of the flight I lost the plane in the Sun and crashed it. It crashed in a very wet. swampy part of the field. I found the plane buried up to the wing in mud. Very little damage, it's like the cowl absorbed a lot of the energy.
Of course I wanted to see video, but I must have "double tapped" the record button...so no video of this epic flight.
After returning home I decided to tear the engine apart for cleaning. While it was apart I decided to drill out the crankshaft so I made an aluminum holding fixture to mount the crank in the lathe.
The stock opening measures .170" and I chose a .184" drill bit for the new hole size. I used lots of spray lube and fed the drill as gently as I could into the hardened steel crank. Low story short, this process enlarged the O.D. of the crank by .001"..so that idea did not work. I suppose the hole would need to be opened up with an abrasive tool.
So yesterday was not a good one for my TD .049 SPEED PROGRAMME.
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Post  TD ABUSER on Mon Nov 30, 2020 10:07 pm

The Datsun took a couple years, miles of MIG wire and gallons of bondo. Thankfully there were patch panels available...but the quality was not good.TD .051 Powered RC Speedster Datsun11
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Post  aspeed on Mon Nov 30, 2020 11:25 pm

Wild guess, 5 litre Ford? I don't know if the strut mounts were adjustable originally. I bought a 4 post car hoist last year. Not into any street rod projects any more, but am happy I went for it. Wish I had done it decades ago.
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Post  TD ABUSER on Tue Dec 01, 2020 12:47 am

aspeed wrote:Wild guess, 5 litre Ford?  I don't know if the strut mounts were adjustable originally.  I bought a 4 post car hoist last year.  Not into any street rod projects any more, but am happy I went for it.  Wish I had done it decades ago.

I've got 2 engines for it. One is a 302 with 10 : 1 ARF heads and a Lunatic solid lifter cam. It revs easily to 7000.
The other is a 302 with a 347 stroker kit that is mass produced by Blueprint. It revs out at 5500 ..but it produces a nice flat torque curve. The 347 dynos at 415 HP. It has basically the same architecture as the Dodge 340 trans am motor.
I put a Tremec TKO 600 trans and 9 inch rear with 4.10 gears and Eaton locker in it.
The Ford engine is so much lighter than the original Datsun engine that I needed to shorten the strut housings 1 1/4" and find shorter cartridges [Toyota MR2] to put in them. The adjustable camber plates were needed to regain wheel alignment. This was a real head scratcher, but so was reengineering the rear suspension.
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Post  TD ABUSER on Tue Dec 01, 2020 1:24 am

balogh wrote:Thank you Chuck. The TeeDeeVooDoo - as I renamed it - is a wonderful top notch quality airframe with excellent maneuverability..too bad the Graupner servos have let me down. Your tip on gluing the servos is also appreciated. Once I venture into this VooDoo experiment again, I will definitely use your and Mauricio's tips.

In terms of speedplanes the Quickie100 powered by stock red postage stamp backplate 190 reedies having Kamtechnik turbo heads are a matching alternative. Less prone to vibration despite the extreme engine speed near 28k, and equally fast.
See my maiden video..]

That Q100 is a great combination of engine and airframe..!
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Post  1/2A Nut on Tue Dec 01, 2020 4:54 am

Yes the 4.1x4.1 makes bit more thrust too.  RC Plane
The single phase line should be 7.2kv lol glad your little wonder made it home what a flight I'm sure!!!
Bummer on the vid it is always a fine point per flight to have everything in order for a crucial vid moment.


The Z turned out nice Chuck Thumbs Up  good to see it done... mean machine mean machine bet it sounds good too!

Thank you for sharing with us nice treat!

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Post  1/2A Nut on Tue Dec 01, 2020 5:23 am

Balogh,

Another trick is to "glue" the foam sticky back tape to the fuselage and servo mounts or servos directly
for vibration absorption with micro servos and where space is limited. Works very well no servos lost yet!
Note the Power HD has bearing and metal gears for high torque use.

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Post  TD ABUSER on Tue Dec 01, 2020 8:40 pm

I am in need of a TD 049 backplate mount.....Kamtech appears to be out of them.
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Post  1/2A Nut on Tue Dec 01, 2020 8:46 pm

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