"1/2 A" & "1/8 A" airplanes These are the small ones...more popular now than ever.

TD .020 Sparrow Hawk foamie - video finally

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Old 08-09-2015, 05:52 PM
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MJD
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Default TD .020 Sparrow Hawk foamie - video finally

Dragged my son out with the iPad this evening for a quick flight on the .020. I'll try to edit together a higher res version, so you can see the rolls and whatnot. Goes like stink, I took it way up then pushed it outside to kill the engine.

https://www.youtube.com/watch?v=ibtD...ature=youtu.be
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Old 08-09-2015, 05:56 PM
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Hmm.. not too many years ago I wouldn't have to screen and edit my kid's voice track.
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Old 08-10-2015, 08:34 PM
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Better video.

https://www.youtube.com/watch?v=5_Ei...ature=youtu.be
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Old 08-10-2015, 09:05 PM
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Mike I watched the original yesterday (this new one is better) I will pop over with my Lil Speedy for a race lol

Spotted some numbers 23.8k / 24.3k / 63 mph
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Old 08-11-2015, 05:22 AM
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It runs around 23k on the ground with that prop, makes sense. My eyes tell me it must be doing around 60 - it's the fastest I've ever seen an .020 move. Now I need something cleaner..
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Old 08-11-2015, 06:08 AM
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Yessah a nice lean machine is in order. I caught those numbers early in the flight there maybe some better numbers.
Perhaps a small delta or a lanky thin pylon type something that tracks on rails you can keep close to the camera.
Adding a throttle sleeve and 1 extra servo isn't much extra weight as a option.
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Old 08-11-2015, 01:46 PM
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Another winter project!
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Old 08-11-2015, 07:17 PM
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Here is my lean and mean Lil Speedy TD .020

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Old 08-12-2015, 06:39 AM
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Yep - nice model, like that one. Is it still active? Lost track.

The combat prop worked out real well, I am maybe a bit surprised how well it performs by comparison to the std Cox offerings
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Old 08-12-2015, 06:50 PM
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Yes the Lil Speedy is ready to fly I have not been taking it out as the Skorch quest has been consuming my flying time.
The combat prop you used did great do you have a pic of it? 3.75 x 2.75" FG
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Old 08-12-2015, 08:41 PM
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My computer must be constipated...the video won't play.
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Old 08-13-2015, 07:43 AM
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Imagine a 24k rpm white dot zipping around the screen like a fly while the cameraman cusses because he keeps losing it. Mind you, that describes a lot of 1/2A videos doesn't it?

I heard if you pour a cup of strong salt water over the motherboard it fixes everything right up.
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Old 08-13-2015, 11:57 AM
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"I heard if you pour a cup of strong salt water over the motherboard it fixes everything right up."
Thanks for the tech tip.........!
After replacing 5 or 6 smashed keyboards, I've learned that technique doesn't work.
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Old 08-13-2015, 06:08 PM
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Here is the prop I made from a Driskill 5x2.75 1/2A combat prop. I checked, it is 3.75" diameter. It seems to be a nice load for the TD.. 22.7k static IIRC.

The array of props is:

3x1.25 Cox TD .010
4x2.5 Cox .020 (banana prop, not useable..)
3.75x2.75 .020 special
4.5x2 Cox .020 grey
5x2.75 Driskill KT-something (source for the .020 prop) (test flight prop for Toucan.. on the video "the slow prop")
5.25x2.5 Driskill KT-something (the Profi 1cc combat break in prop - 34k rich first run.. egads)
Eliminator 4.25 x 4.75 trimmed to 4.0 dia
Eliminator 4.25 x 4.50 (sharp eyes might see the de-lam on one blade.. grr, first flight stopped TDC)

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Old 08-13-2015, 06:13 PM
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Those KT props would be perfect on a Pacer/Mach None type model and a higher revving .049-1cc. 2.5" pitch at 30k = plenty fast and gobs of pull. I've used them as test flight props on all the Profi powered models.
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Old 08-13-2015, 06:37 PM
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3.75x2.75 .020 specialiciouses

Can you still source that prop to mod?
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Old 08-14-2015, 05:16 AM
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I really don't know - I bought a few of each some years ago (10+) from Larry Driskill at Kitting it Together. He doesn't list them anymore, but they were I assume from Russian or Ukraine.

I haven't been searching lately because I still have 3-4 left, and they don't break very often when you don't fly 1/2A combat.
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Old 08-14-2015, 05:19 AM
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I celebrated finding the Screaming Toucan cowl by thinning and shaping a new 4x4.5 prop last night. If the prop gets much shorter the cowl will be the low point and prevent a prop strike..
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Old 08-14-2015, 06:06 AM
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4x4.5 will be a winner for sure 33k gets 141 mph!!!
I bought some 4x4.5 carbon props posted on the Skorch thread perhaps they will pan out strength wise.
28.1k will get me 120 will take it!
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Old 08-14-2015, 08:24 AM
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And with unloading maybe better. The unloading factor is pretty clear in the air on these higher pitch props, I have to launch safely on the rich side which can be a bit of a PITA on a pressure bladder, i.e. launch before it loads up.

I looked at some of those quad props - they seem to vary in how much meat there is in the transition from blade to hub - but those look better than some examples I checked out at the LHS. They were like 1/32" blades butt glued to a cylindrical hub.

I hope to get some doppler passes recorded this weekend.

Last edited by MJD; 08-14-2015 at 08:27 AM.
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Old 08-14-2015, 11:20 AM
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Doppler would be a plus but the crowd chants vid vid vid

Yea agreed on the butt gluing hope not!!!
They claim these are strong, zooming in real close looks like the carbon goes to the other blade on these with additional hub material added.
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Old 08-14-2015, 11:31 AM
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I saw the .010 Sparrow Hawk. I see the .020 Sparrow Hawk. More info on the plane itself, please! Looks cool.

Dave
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Old 08-14-2015, 12:35 PM
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Originally Posted by dbacque View Post
I saw the .010 Sparrow Hawk. I see the .020 Sparrow Hawk. More info on the plane itself, please! Looks cool.

Dave
I'm almost positive it is an HK model, but up here it is marketed locally by Great Hobbies as the Sparrow Hawk, both as a $20 FF glider (split the fuse on the glue line to install RC then glue back together..) and an electric kit like the HK $57 package:

https://www.greathobbies.com/product...od_id=TGHFFSHG

Aha, this is it I think..

http://www.hobbyking.com/hobbyking/s...ider_PNF_.html

And you just need these parts if you do all the linkages etc yourself:

http://www.hobbyking.com/hobbyking/s...ider_PNF_.html
http://www.hobbyking.com/hobbyking/s...Main_Wing.html
http://www.hobbyking.com/hobbyking/s..._Elevator.html
http://www.hobbyking.com/hobbyking/s...nt_Canopy.html
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Old 08-14-2015, 12:46 PM
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Same model BTW just swapped engines, takes all of 60 seconds. Lots of power on the .020! If I'm bored in the winter some evening I'll kludge another together with an .049 grafted into the nose, just for the sake of doing it.
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Old 08-14-2015, 05:04 PM
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http://aerohobby.ca/store/index.php?...ort=20a&page=2

http://eliminatorprops.com/store/ind...products_id=51

Possible feedstock.
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