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Just did some sketches of the Mate - it is too short in the conrod to allow a 60 degree twin ... the cylinders clash by 6mm and also the pistons would too. So cast around at a few more designs and one engine I built is a Mills 1.3 which is a really nice running motor - so looked at seeing if it...

It seems a couple of years have gone by and no one has come up with a Vee Twin 2 stroke design. I have been playing around with some drawings and yes I see that a 90 degree Vee Twin has only half the crankcase pumping as a same capacity single - however a 60 degree Vee Twin has 75% the pumping...

Well I did make the longer conrod and it changed the character of the engine completely. Docile as a kitten starts easily sometimes first flick, and a bit more power. Put it in the Cardinal which weighs 12.5 oz and it climbs about 70 feet a minute. Had 5 flights now and it is a suburb little...

Firstly thanks Mechanicboy for your input ... The Midge is a sideport, so unlike a front or rear rotary valve engine any overlap of inlet and exhaust allows the exhaust to force some of the incoming charge to be pushed back against the incoming fuel/air mixture. This exercise shows that this is...

Have posted something under "Another ML Midge" in the work in progress forum about a possible design anomaly. However the questions I ask are a bit lost there so have started this thread in the hope that those answers might be considered. The quote below from there is self - explanatory ...

Well the Midge was finished some time ago and has now had about 2 hours running. I must say I was a little disappointed with it, as although the fits are very good, it is a trifle cantankerous not wanting to start easily on anything smaller than 8 x 4 props and it is down a full 1000 revs on a...

I would be interested in other's opinions of whether to machine the conrod crankpin on or use a pressed in one. My preference is actually for a pressed in one. As I see it these are the fore and against reasons. The fore's for a pressed in one .. to start. (or against machined on) 1. Pressed...

Venturi done, backplate done, muff done, cylinder done and lapped, crankcase done except needs boring for 6x10x3mm ball bearing and nose bronze bush. Almost there really - I wish ... Seems pretty small compared to the BollAero 18 - the first engine made, the Midge is No.6 Inside the...

Spent about 7 hours so far on a ML Midge build - crankcase essentially done except for adding a 6x3x12mm ball bearing in front of the crank-throw and a bronze bush in the nose. Haven't made an engine for some months - built a Tomboy in that time and flying it with 2 channel radio and a DC...

Hi Graeme welcome from Sylvania Waters - southern suburbs of Sydney. Ed

Have made a few engines now both with machined on big-ends and pressed in ones. Have found in service both to be satisfactory and of course the pressed in variety is a lot easier to make. I know the machined on ones should be more sturdy - but - I wonder if that is necessarily the case. Would...

The plans are available to members of the Model Engine News website. If you look at this page you will see the list of plans available. (you may have to cut and paste) file:///C:/Documents%20and%20Settings/user/Desktop/Model%20stuff/MEN%20DVD%20stuff/men/index.html MEN is run by Ron Chernich...

Here are a few photos of the pattern now ready to give to Camcast. I took it there today and they advised that the cost of 2 castings using fine sand and then heat treating will be $50 each. Have now finished them and sprayed them with silver matt paint to see how they look - and this is the...

After building 5 diesels now, including one from a casting, have decided to take up the challenge of building a smaller one. I know the fits etc are much more critical and that is what will make it that bit harder.. Amongst the MEN plans is the ED Baby, but I don't think the raw casting is...

Thanks Gus, not sure how to do a U-tube thing guess I'll have to learn, I do have a great 13Mb short video of it though. Finally happy with the engine now. To solve the lack of power problem identified as too low a transfer period, I created a pocket alongside the transfer port similar to a...

Guys, Thanks for the replies .... The grade of Ti is labelled Ti Gr2 0 Bar and another spec written on it which might be the supplier's stock number HT=T91226. I looked up Grade 2 on various sites and it is one of the "softer" grades with little alloying of other metals, nevertheless it...

As per post below - made a conrod for a 1.5cc model engine and this is how it ended up - with only ever a few pops and maybe a few multiple rotations - but - no running. Total time in service would be equivalent to around a half minute. As you can see it has galled badly in the extreme, even...

The little sideport engine burst into life yesterday about 2.00pm A lot of lessons learned on the way and I will list them here for any other budding enthusiasts who might be thinking of designing an engine from scratch, but before I go there just a brief mention about the conrod. I decided I...

After much research about machining titanium, I thought the only way to find out about machining this metal was to try it myself. I bought some 9.5 and 12.7 mm rod from a WA supplier with the idea that I would use it to make the conrods for the small diesels I am interested in. I was very...

Some progress with the engine, and a bit of a redesign. Have descibed it all in a .pdf here, meantime a photo of the engine as it stands at present. Ed