jeff2wings

Well a real milestone for me today, maiden flight of my o/d Sorceress 1 and o/d designed/made engine, had too swap out the carb a couple of times before I was happy too fly it,once airborne only required a couple of clicks of down trim ! Best of all was super smooth and tracked well in basic loops and rolling manoeuvres, absolutely chuffed 🙂

Still plodding along whenever I can, not too much of a problem with the weather as it is😒 made the prop driver ,took two attempts in order to get the look/fit that I wanted and did a bit more to the second set of castings

As soon as I looked at the picture I recognised the engine and plane, had a stalker 40se in a Brodack cardinal ,unfortunately I only have a CG spinner in 21/4"

Last major component now finished, now need to finish the induction side ,make prop driver and a pair of piston rings, oh and several hours hand finishing the castings so they don't look like I made them with a blunt chisel.

The 1.8 is a good size, it would be easy to do on the Drummond or the Holly Buddy 2.5 ......... ....that I started a couple of weeks ago

In a word,no,quite frankly your best bet is to go and download a set of drawings from outerzone.com for one of a number of engine designs that are made from barstock and then try and make friends with someone that has a tig welder that can repair the Atom cases in the meantime.

It would be interesting to see if there was any increase in performance over petrol/ignition vs methanol/ignition vs straight glow,l will using a altered head shape for increased compression ratio along with a ringed aluminium piston as used in the Mk2 Atom Minor

Having got out of jail with the exhaust duct time to finish the cylinder and make the head and intake rotor shaping the combustion chamber snug fit !

Got too spend a few hours on this over the last couple of days Hi

So it's the main crankcase that needs repair then?

That's a shame hillclimber,you were doing well there with limited equipment and experience, maybe post some pictures to see if the problem can be resolved. Keith, these castings have been available since the late 40's and haven't improved with age,it's about time Hemmingway made some new patterns as these are not fit for purpose, you only have to compare their Sparey casting with the ones I purchased recently too see that 🤨

Oliver Battleaxe 2cc 1946 v/rare

So with those out the way time to revisit and finish off these two, first one will be done as a full glow version Started in 2022😏

Well that was interesting if a little unexpected, finally stopped raining long enough to test run these engines back to back and get some rpm readings, the dc wildcat on a14x6 MAS and D2000 made 4,150,the first Sparey on the same made..............4,750 ! This was after some fettling that consisted of making a new cp,conrod, resized piston by 'cherry bombing and grinding a much finer taper on the needle valve, the other Sparey made only 4,200 rpm although the fits are a bit tighter so may need a bit more running in,so l think I will call these finished and a success and handedly enough, these arrived the other day....

Looks like a Majesco 2.2 from 1946

So got her fired up this morning with 6 flips of the MK 13x6 prop D2000 fuel with a bit extra either, actually much better than the other one that needs the electric starter too start probably due to leaking past the cp so will have to address that and hopefully get it running like this one. now I need to decide on what model build for it ??

Just waiting for the new set of castings to arrive for the next two

Yes,I know, I have followed a number of your builds such as the boll-aero glow &diesel engines and the Jones 10cc (that I have a set of castings) along with Ramons's And Jason's builds that are both inspiring and intimidating at the same time! I suppose I should really take this over to ME but as a life long aeromodeller I naturally posted here,this is a relatively new side of the hobby for me that started out just fixing up/restoring old engines and escalated from there LOL ! Anyway the castings for the Sparey and Atoms were a job lot from eBay, part of an estate sale that I got for a very good price, but as you have noted they leave a bit to be desired both in dimensions and with porosity within the castings, the new castings I have arriving will be a lot better .

Thanks, it's always a thrill with the first sustained run from an engine you have made,lessons learnt on this build will hopefully make the next three a little less problematic 😀!

Hope your set of castings are better than the ones I have.Be sure too read and take note the MEN build article on the Atom Minor.

Run four tanks through the the engine this morning after changing the prop to a14x6 MAS and the fuel for some D2000 (had been using D1000) the 14" proving more suitable than the 16' wood that I used for one run.

Ron's notes actually state the backfire was due to excess fuel from the course taper on the needle valve which gave a 1/2 turn from fuel shut off to running and shortening of the cp due not being able too back off sufficiently for slow running, both issues having been dealt with when I first built this engine.

I brought them from Hodakov Tolik who is in Odesa Ukraine you can find him on Facebook $40+postage. So I gave the engine a thorough clean in the u-son strapped a 16x6 wood on it and had a go at getting it to run, got a few short burst from the prime but it kicked back a few times and loosened the prop, so on the fourth time gave it a bit extra on the spanner, and the end of the crank snapped off!! Point of failure being where the centre drill hole finished. 'Oh bother ' I said (para phrasing here) so stripped it down again ,cut a bit more thread,took 20 thou off the shoulder to reduce end float and made a new prop driver in keeping with the original. I think the next time I will use a MA or APC probably 14 or 15" .

Thanks, well l'm getting the hang of it now, so................😁