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Hadn't run this little guy in a while, somewhere lost the original venturi and tried using a cobbled up affair from a Cox engine. That didn't work. So couple days ago set about making a new one in brass, 2 mm throat, 2 mm screw as the needle. Made a holder and whittled the needle down to almost...

Hi Rodrigo, Have been playing with this after a year of it sitting on the shelf. It is a sweet little runner and I think well within the bounds of a second or third build for anyone interested. Did you ever get around to finishing the plans we worked on a while back ? Kind regards .. Ed

Hi Sheraz, if you look at the front housing it is 28 mm wide and 30 mm high - so the centre is 15 mm from the bottom (or top) ... cheers .. Ed

I have started a register of Holly Buddy's that have been built - if you have made one could you please add it there. Can be found at https://www.homemodelenginemachinist.com/threads/holly-buddy-build-register.35234/#post-397063 Would love to see Chris do the same for the Boll-Aero Ed

5. Holly Buddy Mk 3 ... Wanting to make it look a little prettier - uses screw threads to attach nose, backplate cylinder and muff. Screws at the rear also hold it from turning. Looks totally different but it is the same inetrnals - just different clothes !

4. Holly Buddy Opposed Twin. This one is 2 Holly Buddy's opposite each other. It cheats a bit and uses the cheeks of the intermediary bearing as much as it uses the bearing itself. Figured no worse than running an engine as a pusher where the prop driver runs against the crankcase in a plain...

3. An inline twin version, basically 2 Holly Buddy's joined together - the crankshaft feeds the 2 crankcase cavities though inlet ports in the crankshaft 180 degrees apart.

2. The Mk2 version. Made using a pattern and then a casting which I had hoped to be able to supply at reasonable cost, but it turned out to be rather more expensive than I had hoped.

1. The prototype. The first one built.

I know there have been quite a few Holly Buddy's made and thought it would be great to have a register of them and those engines based around it. As it was HMEM where I first wrote up the build of the prototype, would be good to have a listing of completed builds here. Maybe a few photos and a...

Started the new HB (Mk3) yesterday - fired and ran a few seconds in my hand ... today drilled the mounting holes and put in the test rig and ran very nicely, easy to start - in fact it started 4 times on case fumes after the 3rd 1 minute run. Haven't leaned it out yet or wound the compression to...

Here is my next edition of the HB - using screw thread everywhere to hold it together and to allow for the muff to be a nice fit on the top of the cylinder. Piston, rod, prop driver and washer to go. Been a long project - started about 10 weeks ago - things keep getting in the way. Plan is to...

Stunning, stunning work, Patrick. Love the sound they make when both cylinders on song. A bit more temperamental than say a Taplin Twin as - as you say - it is really 2 engines liked together with a common shaft. Would love to see the plans on Outerzone one day.

I have been building and designing model engines now for quite some years and have been modelling for over 65 years. I have designed from scratch about 11 model diesel engines and built them and they all run - and have had a couple put on CAD by kind fellow enthusiasts. I would like to have a...

I might as well start the built from Outerzone plans input. These are the engines I have made from them .... 1. First was the BollAero18 my first build. 2. Owen Mate 3. Mills 1.3 4 a twin ballrace 2.5 version of the Owen Mate using a cast crankcase 6 ML Midge 7. Vee twin based on ML Midge 8. Vee...

Steve at OUTERZONE has now created a category and loaded an initial batch of 36 plans. If you have any that aren’t on the site or have some that are your own that you have made an engine from, then Steve would be happy to load them. They need not be on CAD, so long as they are legible and...

OUTERZONE have, since 2011, been the go-to place for model aircraft plans. As of Thursday, they will also be hosting plans for model engine building with the initial 2 plans going on. Over the next few weeks many more will be loaded which will be around 40, so after this initial batch is on -...

Some more photos and the link didn't go on for some reason ... here it is Note the run was only with what filled the small diameter fuel tube - pretty frugal !

Just a quick report on a new motor just finished. I have called it the Mini Buddy as a follow on from the Holly Buddy and Holly Buddy inline twin. The design had to incorporate these design features Easy to build Enough power to fly a free flight model around 24 to 30 inches Long lasting Easy...

Just a quick report on a new motor just finished. I have called it the Mini Buddy as a follow on from the Holly Buddy and Holly Buddy inline twin. Great that Patrick Strobel is doing the CAD plans for this one - thanks Patrick.. The design had to incorporate these design features Easy to...