Android "RPM Gauge"

The pipe has made 51k rpm at that length with a Picco P0 .05 - for this test the needle valve is not set for peak yet with a pipe, Tested the exhaust restriction valve to lower rpm. Was a function check proof of concept - want to be able to throttle it down some as needed.

A fuel tank needs a open vent line as fuel is pulled into the engine the vent line allows air to draw into the tank until the fuel is depleted. My tanks only have 2 lines clunk and vent. I fill up the tank through the clunk line and the vent expels the air as the fuel fills up the tank. Most a vid when you can I have subscribed to your channel. Look forward to seeing the project. You have your vids set for kids no one can comment. =)

@@AmpAbuser ok, makes sense as it runs fine on a 3 line tank. I guess I’ll refuel via the line that goes to the Venturi and leave the refuelling line open as a vent. I’ll post a video when it’s finished, it’s like a combat wing converted to 049 power. Also building a pylon racer similar to your lil speedy, sheet balsa wing with an airfoil sanded in. Thanks! Oh, and how did you construct your tank? I used a small plastic bottle, cut to size with a 3D printed cap for the two pipes. I then coated the cap with epoxy to make watertight and secured, unfortunately the fuel seems to degrade the epoxy so I need to find an alternative.

@@AmpAbuser those are just a couple old videos, forgot they were there haha.

The car engines produce their power at higher rpms, speed props and tuned pipes make for a great combo. .12 size engines have been popular with outrigger hydro boats. I have projects with .05 and .07 car engines that fly very well with their planes. Example here- kzbin.info/www/bejne/Z3WVpJZje9mggas

@@AmpAbuser thanks, I’ve been looking at an uctkam 1.5cc which I know is also used as a car engine. I also saw your post about carbon fibre tuned pipes for cox engines, have you made one yet?

@@sams0748 That 1.5cc engine has been ran in boats and planes bit older tech and heavy but is a .09 with a pipe! I have obtained some carbon sock in two dia. to try DIY tuned pipes at some point need a lathe to shape the wax plugs to melt out after the epoxy is cured enough.

@@AmpAbuser how would you connect it to the engine?

@@sams0748 Engine header pipe to silicon tube to tuned pipe.

If you look close top left side of the engine mount there is a small brass tube, it is the vent for the fuel tank, the other side has the same size tube that feeds the engine carb. So during fuel draw running the vent sucks in air to help move the fuel. Uses a 15cc nylon bottle tank.

Here a exhaust header was added with a pressure tap: kzbin.info/www/bejne/Y2rUo2yOjtaJbMU

@@AmpAbuser Thank you!

Thank you, can remove the fuel tank and put a plastic horse shoe style backplate - ExModels or Cox International sells them new can add a 1 oz fuel tank and throttle sleeve.

Thank you Chris, stats are listed in the vid post here -130mph best pass: kzbin.info/www/bejne/aZqXo2WhebR1orM

Thank you, same header with a 4x4.5 prop made 28.1k rpm here: kzbin.info/www/bejne/gX20iWtndpp8o6c

Thank you, it's a scratch built design of mine you can find info and drawings here of the design: www.rcgroups.com/forums/showthread.php?2684743-Speed-Planes-010-to-15-Size-Engines

Some were pull cord start, some internal spring wound to start. Later the simple external spring.

Trick is to create a solid visual profile from afar using black as the primary color - which does not hide nor blend within the colors of the sky.

Fuel tube found here: coxengines.ca/fuel-tanks-lines/cox--049-1-2a-silicone-fuel-line-3.html

@@AmpAbuser thank you for teaching me! Helpful!

What plug brand / heat type did you use? I am using a OS Gold No. 80 plug. My fuel used has 20% all castor keeping the engine at a thermal state that allows higher rpm and improved compression.

@@AmpAbuser OS 8 which I think has the same functional heat range as the OS 80. Sig 25% nitro with 20% 50-50 castor synthetic oil used - maybe this is the culprit? Though I am curious why slightly different oil costs almost 4k rpm...

@@tedbacks6365 Fuel tank level, age of the fuel, warped prop, gold plate plug improves continuity and bling lol. I am around 580ft sea level and ran it in a climate controlled room 71F. Note once you sag the small motor it needs to simply be ran rich for a bit to reduce total frame heat to a lower level, from there you can reset the NV for top rpm. If your engine was used could have been ran with too much prop / heat / lower oil package / or simply just a dud / check head shim count and leak free tank and lines. Can not recall if the muffler had a baffle. My engine was bought used on ebay. I have 3 of these engines 2 came new in the box complete with everything sold with the engine. Here is a test with one of the new in the box versions: kzbin.info/www/bejne/hmKTiaaGq9Cfm68

Yes I do and can recommend props based on particular engine / plane combo. To learn more check out my vids: www.youtube.com/@AmpAbuser/videos

Yes, thank you Chuck - discovered during this flight: kzbin.info/www/bejne/pZqvgpmrhpmsbJY

Good eye, Flywheel No. 4C OS .46 VX-M / Part # 71804020

Yes it is, you can go here and post pics for folks to review and chat about it: www.rcgroups.com/1-2a-planes-182/

.8cc Profi tuned pipe try a google search =) been about 5yrs. ago since I bought one off a site in California.

Thank you David, it's a 1oz converted nylon bottle with rubber stopper from test tubes. Way less weight than a stock Sullivan tank. www.rcgroups.com/forums/showpost.php?p=38478526&postcount=183

Thank you Laurenz, looking forward to many more vids, plenty of benched engines to fly.

Hi Sam all the info and more on building NANO style .010 thru .09 cox engines per this link: www.rcgroups.com/forums/showthread.php?2684743-Speed-Planes-010-to-15-Size-Engines

Thank you Alfredo, its a Profi .8cc Tuned Pipe out of the Ukraine they are heavy into CL combat and high performance FF. Pipe also works with the SH .07 size engine.

@@AmpAbuser where can I buy one

@@2259alfie try a google search been about 3yrs since I bought one.

It's more than just the pipe if you want your engine to do this....