COX .020 POWERED SPEEDSTER

1/2A Nut wrote:Awesum sauce CHUCK!!!!!!!!!!!
Plenty of room in that belly with enough firewall for a radial mounted TD .020

I was out of 1/64 and 1/32 ply or I would have used that instead of 1/16" balsa for the fuselage
The sides are cross grain 1/16 balsa, the top and bottom sheeting  is just 1/16 balsa...... so it's possible to sand the corners of the fuselage without needing to add tri stock internally.
There isn't much room to spare between the aileron servo arm and the 200 ma LIFE pack that needed to go directly below.
The elevator servo had to be mounted aft of the wing....so instead of making some sort of a separate hatch I just buried it....
As a licensed Electrician I find it hard to deliberately make an electrical device like a servo not "READILY ACCESSIBLE"...

Next one of these I build...I'm going to do it much more like you did in order to make it come out lighter.
Thanks again for the time you've spent getting me "up to speed" and with the "how to" and "where to go" advice.
Thanks go out to Greg at .....https://kamtechnik.com/ for all of the very fine specialty equipment he sells to support the fuel burning engines in our hobby...!

TD ABUSER wrote:As a licensed Electrician I find it hard to deliberately make an electrical device like a servo not "READILY ACCESSIBLE"...

Haven't heard those words since retiring 12 years ago. Applies also to HVAC and plumbing.

Your mention reminds me, hearing song and dance from various less than honorable building contractors on federal jobs whilst inspecting, reason why specs spell those words out on HVAC filter banks, plumbing valves and yes, electrical boxes.

Found electrical boxes on new work with construction debris, wiring insulation tailings and wire clippings, electric panels with circuits unlabeled, etc. Tells me electrician wasn't proud of his work but in a hurry.

This is why I enjoy bell ringing on my saxophones with the Salvation Army at store fronts during Christmas. Now I am the song and dance man. (I should have made the Army Band my career.)

Most welcome Chuck,

https://www.youtube.com/@AmpAbuser/search?query=Kamtechnik

I tested many of the prototypes to ring them out for the masses.
Was a fun time to think of the solutions and what the offerings should be.
A search on my youtube channel will show cox / norvel /g-mark proto parts tested.

The most difficult part to sus thru was the turbo plug adapter for
the TD .020 / Pee Wee .020 a clear jump in power was required.
Much testing over many various compression levels, combustion
chamber shapes. 1.5 yrs of testing / tweaking as i recall.

Think friction reduction and strength is key for high speed hence the ply.
Narrow as you can go based on the gear you have to reduce the R value.
Foiled flying surfaces to gain more control and allow them to be smaller / lighter.
140+ is possible with a TD .020.  3.7x5N








 

GallopingGhostler wrote:

TD ABUSER wrote:As a licensed Electrician I find it hard to deliberately make an electrical device like a servo not "READILY ACCESSIBLE"...

Haven't heard those words since retiring 12 years ago. Applies also to HVAC and plumbing.

Your mention reminds me, hearing song and dance from various less than honorable building contractors on federal jobs whilst inspecting, reason why specs spell those words out on HVAC filter banks, plumbing valves and yes, electrical boxes.

Found electrical boxes on new work with construction debris, wiring insulation tailings and wire clippings, electric panels with circuits unlabeled, etc. Tells me electrician wasn't proud of his work but in a hurry.

This is why I enjoy bell ringing on my saxophones with the Salvation Army at store fronts during Christmas. Now I am the song and dance man. (I should have made the Army Band my career.)

What I found a lot of while doing work in old buildings was MILLIONS of open junction [splice] boxes.
One of the worst examples was at the Seattle PUBLIC SAFETY Building........
I had to crawl above the ceiling in one of the lobbies of that building to run a conduit.
My flashlight died, but there was a faint light in the distance to guide me to my destination.
I noticed that I was kneeling on a pile of large electrical cables....big enough to be the power feeds to main panels on the upper floors.
That is exactly what they were...100s of pounds of 250 amp cables just laying loosely on top of jagged lathe and plaster framing.

1/2A Nut wrote:Most welcome Chuck,

https://www.youtube.com/@AmpAbuser/search?query=Kamtechnik

I tested many of the prototypes to ring them out for the masses.
Was a fun time to think of the solutions and what the offerings should be.
A search on my youtube channel will show cox / norvel /g-mark proto parts tested.

:

Do you use Park Flyer hardware for the ailerons...?

Nylon listed as micro good with TD .010 AND .020 projects.



https://www.ebay.com/itm/134986543372?_skw=micro+nylon+control+horns&epid=691253053&itmmeta=01JAPJYDSGBWP6KSEZ01ZM0W3D&hash=item1f6dd3310c:g:KRsAAOSwtN1l-yNV&itmprp=enc%3AAQAJAAAA8HoV3kP08IDx%2BKZ9MfhVJKm1WftS9Zgc1o3YPfpN8jIaQWdFq7tnqY9mq0TzMJ2HzDuLK9L0SV8IOZ26%2Bno5l4uxtQKaBThmh9L6HNUyg1AS3n73Vlut6ldTtAbJtZAUYhIdDYpWsGN6G6yReVZ3tXZ9n2l9LyTp4nD8EEvlQr3d2JEanoj5O2RLIwS%2F%2BZBKItqhIN8JbXmkha%2FuKt0QU2YH4LSKYz0ipHMEQ6byON497Qtf1IrCwGGVDuNdst%2FXF%2BE%2BPTJDTz2Ky1Wp2%2Far4FghaVPjqGtmKodro8gXtmUdnlqESUdz8k8iELEtiYbhPw%3D%3D%7Ctkp%3ABk9SR_Lc-dLVZA

1/2A Nut wrote:Nylon listed as micro good with TD .010 AND .020 projects.



https://www.ebay.com/itm/134986543372?_skw=micro+nylon+control+horns&epid=691253053&itmmeta=01JAPJYDSGBWP6KSEZ01ZM0W3D&hash=item1f6dd3310c:g:KRsAAOSwtN1l-yNV&itmprp=enc%3AAQAJAAAA8HoV3kP08IDx%2BKZ9MfhVJKm1WftS9Zgc1o3YPfpN8jIaQWdFq7tnqY9mq0TzMJ2HzDuLK9L0SV8IOZ26%2Bno5l4uxtQKaBThmh9L6HNUyg1AS3n73Vlut6ldTtAbJtZAUYhIdDYpWsGN6G6yReVZ3tXZ9n2l9LyTp4nD8EEvlQr3d2JEanoj5O2RLIwS%2F%2BZBKItqhIN8JbXmkha%2FuKt0QU2YH4LSKYz0ipHMEQ6byON497Qtf1IrCwGGVDuNdst%2FXF%2BE%2BPTJDTz2Ky1Wp2%2Far4FghaVPjqGtmKodro8gXtmUdnlqESUdz8k8iELEtiYbhPw%3D%3D%7Ctkp%3ABk9SR_Lc-dLVZA

Thanks...!

Tough enough for full throttle smacks into hard ground.

1/2A Nut wrote:Tough enough for full throttle smacks into hard ground.

I'll bet...!
I just placed an order with National Balsa for all thickness of aircraft plywood.
There are times where nothing is better for the job.

Today I applied a few coats of butyrate dope to the bare wood to act as a primer / sealer.
Then I mixed up about 40 ccs of automotive grade urethane paint and used a Badger air brush to apply it.
Most of what I mixed up never got used.
What's left to do is put a couple of white stripes on the top of the wing panels. I doubt that I can iron on plastic stripes without melting the paint...so I have some old white Klasskote epoxy primer that ought to work. [?]
The KK primer is probably only 10 or 15 years old so it ought to be OK.

https://www.ebay.com/sch/i.html?_trkparms=folent%3Awisolme%7Cfolenttp%3A1&_trksid=p3542580.m47492.l71970&_ssn=wisolme

FYI Valentine bullet spinners are a nice touch.
Lower mass unloads with balance less friction / heat.


Studs with hex heads allow tight fit so only the spinner backs off.