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I've been around RC a long time, but never owned a radial myself until I built the O5. At some point I'd like to make a collector ring for my O5 & future engines. And reading the posts here, familiar with trials & tribulations of stainless exhaust systems: annealing, filler, maybe bit more...

Stumbled on this YouTube channel. A Malcolm Stride 15cc, a self designed V6, nice clocks & more. https://www.youtube.com/@KevinWoodsWorkshop

Not 007 Roger Moore from James Bond, someone even cooler, Haha. Check out his YouTube channel. Micro coil on plug (therefore micro coil winding). Electronic fuel injectors. Still work in progress but amazing achievements. https://www.youtube.com/@rooj65

I started Googling what the resistor was all about on typical RCEXL type CDI ignitions & it looks to be quite a controversial rabbit hole. Some say to prevent arcing issues if you cant rely on the ground return path through the crankcase assembly. Others say its for RF issues related to RC...

I was having a discussion with a buddy about choices of bar stock aluminum for making (ringed) model engine pistons. Somewhere in my travels I assembled some notes of what others were using & why, but they seemed to have vaporized. His point was that you cant simply use alloy strength parameters...

Slowly inching towards test day of my (50cc) 5-cyl radial. I'm not expecting a miracle like pop-pop after a few flicks of the propeller. Rather, likely many flicks required & I don't have the best shoulder. I have RC experience & still have a Sullivan electric starter with the typical silicone...

I'm considering getting a carb manifold adapter printed by a friend who has a 3D printer because the shape is kind of funky to machine. Its mostly to evaluate the carb itself so not really intending long term use. If it works out I'll machine a permanent one from bar stock. What kind of material...

Just stumbled on this YouTube site. Some very nice engine & RC work. https://www.youtube.com/channel/UCoe6nJyZTQfHECEG-6kT3Cg

I'm thinking of making a simplified tubing spring clamp. The dimensions will vary slightly but just as a guess, say 0.300" OD x 0.030 WT x 0.100 axial length. The application is to squeeze silicone tubing couplers against aluminum tubes. So I want to open them up slightly to slide into position...

I need to permanently attach these two 2 idler gears together. I had in my mind to drill a hole centered on the joint line & axially insert a key-like dowel pin (matching drill bit shank cutoff) parallel to the shaft. The axle hole is 5mm ID. The intersecting hub is 7.5mm OD x 4.5mm long. I'm...

A friend of mine acquired this chuck & he is looking for information. Does anyone have any web links / catalog type specs or even useful comments? Unfortunately I did not take a picture of the back side, but its direct threaded (to Myford ML7 spindle as per the stamping). I Googled a bit on...

Was just clicking some of my website favorites recently & saw this unwelcome news. Sad. he was obviously a very talented builder with many skills. It is with sadness that we must announce that Gunnar Sørensen has passed away on January 22, 2021...

For any of you RC engine enthusiasts, I found this website which has a nice selection of past engine reviews. You know, back when 'review' actually meant disassembly, measurements, run testing, useful commentary, performance numbers... as opposed to the more modern pain of watching someone open...

Intro I’ve been working on this radial engine on & off for <ahem> more than a few years now. You may have seen some of my prior questions or random posts scattered elsewhere on the forum. Progress has been pretty slow with the usual factors - time constraints, distractions & learn-as-you go...

I'm making up the induction tubes for my radial. The trumpet flaring profile is coming out reasonably consistent. They need a bit of dressing but in the end have ~ 0.030" flat on the end to match the internal port counterbore face. The nut seems to engage OK. Initially after trying different...

I bought some plans from Modelltechnik, maybe the next project, not sure yet. https://www.cad-modelltechnik-jung.de/construction-plans-model-engines.html He uses a built-up crankshaft method with Hirth couplings to join mid span crankshaft journal segments, which are then concentrically...

Just stumbled onto this YouTube series. Some interesting details on the mags as the title says.

Has anyone seen a supplier of ball ended rubberized abrasives? Kind of like what these diamond abrasive profiles are, but made from rubber-like abrasive like the green ones? I can somewhat form a ball by sacrificing a cylindrical profile using a dressing stick, but not very well. I tried...

I thought it might be beneficial to share information & experiences on this subject because it seems to come up often. The typical reason behind grinding in general is to achieve a high degree of accuracy as well as surface finish. Personally, I am interested in what you have achieved with...

I'm just about to make the pistons for my 5-cylinder radial. The plans call for a cylindrical profile, the bottom skirt portion is shelled out and a further deeper milled slot for the link rod. I noticed the Edwards radial is much the same. But I've noticed almost every RC 4-stroke engine I've...