1/2A Speed .010 to .15 Size - RC Groups
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Jun 17, 2016, 05:30 AM
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Amp Abuser's Avatar
Cool

1/2A Speed .010 to .15 Size


Upon a good suggestion we have a thread for 1/2A speed .010 to .15
and .20, .26 and .30 size 4 stroke engines set up for speed!


FAST~~
- Pattern ships
- Pylon racers
- Dedicated Straight Away Max Speed
- Hot Liners
- Sport Speed
- CL Speed

If it's fast please share. Dig out your favorites from the past and post away your experiences, old and new pics and video video video!

Will post my latest effort the DART .09 to start it off.
Work in progress here is where I am at thus far..10.9oz ready
to cut out the ailerons and cover it up with some bright colors.
Should be around 11.6oz RTF.

Last edited by Amp Abuser; Aug 06, 2016 at 11:50 AM.
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Jun 17, 2016, 05:46 AM
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Lil Speedy II - .049

Lil Speedy - TD .049 / 118 MPH Best Pass (4 min 54 sec)


Published on May 7, 2016

TD .049 /SPI / Throttle Sleeve Ports Allow SPI function / Prop 4.1 x 4.1N / 30% Nitro
Static 24,790 rpm / 7.4oz thrust / .127hp / 94.74w / 96.2 mph / 6.19oz RTF
Unloaded 30,492 best on Vid 1 / 118.4 mph per prop calc.
Doppler reading has it at 117mph per pass at 1:47mins into the vid.
Hard tank no pressure tap.


Lil Speedy TD .020 / 3.5 x 3.5 Prop 105 MPH (9 min 58 sec)


Published on Apr 23, 2016

Lil Speedy TD .020 / 3.5x3.5 Prop / 35% Nitro / 20% oil / 84F / 6 to 10 mph winds
Best static 24,644 rpm / 82 mph / Best pass 30,742 rpm /102 mph per prop calc.
Per Doppler Reading E-flite 3.5x3.5 best pass 105.12 mph


Lil Speedy II / TD .010 / Test Flight 3x2E Green Drone Prop (11 min 57 sec)


Published on Feb 15, 2016

Lil Speedy TD .010 / Test Flight 3x2E Green Drone Prop
Best pass cross wind 32,792 rpm / 62 mph / per prop calc.
Solid pull better loops and faster turns great prop with a throttle.
Down wind passes:
33,941rpm / 64 mph - per 2in pitch / and calc slip.


First Maiden Flight with stock black prop:

Lil Speedy II / Cox TD .010 / Stock Prop / 35,186 rpm / 42mph / 35% Nitro (6 min 23 sec)


Published on Feb 13, 2016

Lil Speedy II / Cox TD .010 / 3ch with throttle sleeve
Stock 3x1.25 Black Prop / best pass 35,186 rpm / 42mph / 35% Nitro
Average pass 33k / note after launching into the wind
In the hand just before launch 27,212 rpm.
most of this flying is cross wind to avoid the gusty conditions
Last edited by Amp Abuser; Feb 20, 2017 at 12:08 AM.
Jun 17, 2016, 05:51 AM
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Lil Speedy .020

TD .020 3ch Lil Speedy - Flying On a Rare Cox 4x2.5 Prop (4 min 29 sec)
Last edited by Amp Abuser; Jun 17, 2016 at 06:01 AM.
Jun 17, 2016, 05:59 AM
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Skorch I - .061

Norvel .061 Tuned Pipe
1/2A Skorch 1st Test Flight AME Norvel on a Profi Tuned Pipe (4 min 49 sec)


Stock TD .049

3rd Flight - 1/2A Skorch TD .049 RC (9 min 58 sec)



Modified TD .049

Flight Cox Killer Bee Piston Cylinder / Tee Dee Frame RC Carb (11 min 31 sec)
Last edited by Amp Abuser; Jun 17, 2016 at 06:10 AM.
Jun 17, 2016, 06:18 AM
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NANO I - TD .010

4 pitched prop
NANO - TD .010 / 130.4 MPH - Best Pass Per Doppler (4 min 50 sec)


3 pitched prop
NANO TD .010 / 2.7 x 3N Speed Prop / 115.74 mph best pass (4 min 34 sec)


Nano I has been upgraded to a TD .020

I will have some vids of this after winter. All up weight less fuel 3.38oz
the lowest weight TD .020 2ch plane I know of. I expect speeds beyond
imagination with the right prop. My guess 3.3 x 4.5N / 155+ down wind dives.
Last edited by Amp Abuser; Feb 20, 2017 at 04:27 AM.
Jun 17, 2016, 09:47 AM
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OK, here are some of mine. It is amazing how long they last when you don't fly them. There is a delta pylon one with a .25, but the fastest guys used .15s. The ,21 profile proto is for a .21, but I have a Rossi .15 in right now, and the TD delta was a gift as it did not have enough up to stay in the air with monoline at the time. Maybe 1980? I will get some other pics that were just at theNats, not mine.
Last edited by aspeed; Jun 17, 2016 at 10:03 AM.
Jun 17, 2016, 10:09 AM
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Couple more, I have a few other .29 size pics from the Nats, but they don't count I guess. The cute ones are Perky Speed. .15 size with a 1950s design. They can go over 100 mph, but the average speed is the way to win.
Jun 17, 2016, 10:38 AM
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Nice eye candy Alan!

Yessa for two strokes the madness must be curbed at .15's. The small 4cyl engines floating around put out similar power of a good 15
and can be shared in the thread to represent. I have owned the OS .20 4cyl it can swing a 7x6 fairly fast. They need good amount of
pitch to get any speed out of them. Today I own the 26 Surpass and Saito 30. 7x7 / perhaps 8x8 for speed.
Jun 19, 2016, 04:27 AM
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DART -TD .09

11.67oz covered less 3 nylon horns and two short pieces of piano wire
for the ailerons. Custom cut 5x6N prop good for 130mph +
Will go with neon pink for the DART logo and # 9 race number
Full sheet shrink film holds the ailerons and elevator in place, very hard
to see the ailerons lol..the underside thus far is solid neon pink, neon
blue fuselage. 4x2.75x31.5' / 106.31 Sq. In. wing.




Performance enhancements:

- High speed performance crank
- Valentine Turbo Plug Head / OS Turbo Plug
- Kustom Kraftsmans 128 tpi NV
- KK big bore venturi
- Throttle sleeve - cut for SPI
- SPI Cylinder - dual bypass ports (not the RC version)
- Valentine .049 bullet spinner tapped 6-32 thread
- KK .09 back plate with fine hole pressure tap.
- Aluminum carb body
- Phenolic thrust washer (for elect. starts)
Last edited by Amp Abuser; Jun 22, 2016 at 04:34 AM.
Jun 22, 2016, 12:27 AM
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holy crap I have a new favorite thread
Jun 22, 2016, 09:27 AM
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I found a few more pics in my files that kind of fit in with your rules. The Sig Scamp is not super fast but was used for club pylon racing when it was popular. The Wild Thing is kind of fast, and the low wing .049 plane I have no idea what it even is but it looks fast.
Jun 23, 2016, 06:03 AM
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Nice planes Alan, I do like the blue and orange one for sure they move and groove with some speed. Thank you for sharing!!





Done ready to maiden flight the DART- TD .09 this weekend with a MA 5.5 x 4.5

Throttle sleeve opened 1/2 way to help suppress some noise:

More testing 18.9k / 5.5x4.5 / needle is not there but its results..
.2hp / 149.2w / 81mph / 15.3oz thrust engine is loud loud loud
Test had to happen fast with no needle tweaking just got it
whaling along then shut it down. Stock prop was causing some
vibrations going to need to balance it before moving forward.

The pressure started overwhelming things as the throttle went
down the pressure did not .. so no pressure for RC its full bore
or nada with that back plate. Removing. A full fuel tank brought
the plane weight to 13.59oz. So tank holds 1.69oz of fuel.


2nd try no pressure half open throttle sleeve
Cut MA 5x6N / 17.6k / 101 mph / 9.3oz thrust speed prop
was already balanced ran smooth. Idle was good
will test fly next. CG is good with a full tank the
oil spray is acceptable although twice as much
as a .049.

Stock APC 5.25x6.25E / 18k / 107mph / 11.4oz thrust / 149w
Should do 22k down wind 130 mph


Completed weight ready for fuel 11.9oz.

A light weight version could be done without the ply fuselage but I wanted mine to last.
I think its possible to hit 10.5 oz. RTF with all balsa build up.
Last edited by Amp Abuser; Jul 03, 2016 at 12:07 AM.
Jul 03, 2016, 12:06 AM
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DART -TD .09 / APC 5.25x6.25E / 143 mph best pass (3 min 26 sec)


Published on Jul 2, 2016

Best pass level 143mph / per prop calc
Temp 96F (16,975 rpm at launch) 30% nitro

Wavescope: 232.07 kmh / 144.2mph / going down wind gave it an edge.
The reading was taken at 1.52mins into the vid.

Out of all the TD .09 speed plane vids online there is nothing even gets close to it thanks to modern gear / props and 106sq. in wing.
Last edited by Amp Abuser; Jul 06, 2016 at 11:15 AM.


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