David Ovenden
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Posts posted by David Ovenden
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23 hours ago, Paul De Tourtoulon said:
The thread on the main needle is the same as my Novarossi and super Tigre, so if anyone is short of a main saito needle,,,
I ran it up after all was adjusted, on crap 10% fuel and a really dirty old saito plug, no exhaust just the tube piece supplied with the engine, I will sort the silencer out tomorrow with any luck, I got 2.000 rpm on the idle and 9.700 rpm on a Graupner ( old grey one ) 13.5 x 8 hell does this motor 'thump' and vibrate.
I have got a 12x1.0 tap and a die to suit the Saito 100 exhaust thread if you need them Paul. Also an "anti-vibration" engine mount if you want to try it. Think its a Weston-made one.
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Thanks Paul
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Yes exactly, which is why it's surprising the 125 doesn't have a spring when other Saito engines do. And my 125 is exhibiting some lack of precision at tickover revs. It seems likely that a barrel spring would help with this.
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4 hours ago, Paul De Tourtoulon said:
Thanks David, the two up for sale are the newer ones,,,
or maybe there is only one version,,,
I think there has only been one version of the Saito 100 and Saito 125 (which are based around the same later style crankcase.
Older engines were gradually updated to b type crankcase or phased out.
The 45, 50, 56, 72, 65, 80, 91 and 115 all disappeared in Saito's rationalisation plan a few years back now.
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Yes, I have the manual and (although the picture is a bit vague) I couldn't see a spring shown.
Which begs the question, why do the saito 82, 100, 115, 120 etc all have springs but not the 125? Cost cutting? Surely not. I suppose it must work OK without one.
Though mine seems to lack a bit of precision in returning to the same tickl-over rpm, which is why I was investigating the carb. Will give a clean up in the ultrasonic cleaner and retry.
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A question to those of you with a Saito 125. Does it have a spring in the carb to push the throttle barrel out as it opens? Obviously there is diagonal slot in the barrel which (with retaining screw in the body) causes the barrel to move in and out and controls the mid/low mixture. But should it have a spring too. My Saito 115 has a spring. But the 125 instruction manual doesn't seem to show one; and on the Macgregor site the photo of the replacement throttle barrel for the125 doesn't show a spring, whereas the photo for the 115 does.
So does anyone you know if the 125 should have a barrel spring or not?
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Yes, but the Saito 100 has not been updated so there is only one version.There is no a or b model of the Saito 100. Other older models were updated multiple times over the years. The saito 45 for example changed lots of times including crankcase, timing, webbing, carbureter, head design etc. The main difference between a and b models is the camshaft housing, This is well illustarated by the saito 82 . See pics
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38 minutes ago, Paul De Tourtoulon said:
Ok thanks, so no real performance diffences ?, have you any pictures of them so that I can sort out what the two sellers have ?.
I don't believe there are A and B versions of the Saito 100. There is for the 82 model and several others too Mostly it was a change in the cam housing design. But the Saito 100 was recent enough to have had the "new design" housing from the start.
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55 minutes ago, Paul De Tourtoulon said:
Wiring done in a cloud of mosquito's,,,🤒
Nice work Paul. Amazing that you kept the soldering iron steady with all those Mozzies about!
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8 hours ago, Paul De Tourtoulon said:
Not much movement, is any one watching or interested ?.
Watching and interested Paul. Good to see you are fitting decent size wheels and upgrading the retracts. Why do ARTF warbirds always come with tiny non-scale wheels?
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1 hour ago, Paul De Tourtoulon said:
Ok a two stroke was fun back then I had a Yamaha 350 RD, a real smoke machine, two weeks ago our local motorbike track had a only 2 stroke day the only missing bikes were the Kawa 750 and Suzuki 380, what a lot of smoke and noise even for me.
I used to own a Suzuki GT380 triple. Fun but smokey.
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If the ST carb and needle valve were designed and made in Italy I would have thought it would be a metric thread. But that's just conjecture on my part.
From your measurements maybe 2mm x 0.4 pitch??
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5 hours ago, jeff2wings said:
That an excellent looking colour scheme, what paint did you use? I'm still reworking my one but have no more silver solartex
It's a 1950s Dutch navy scheme (one of the option schemes in the Airfix plastic kit). Paint was 3V3 2 part paint (now discontinued) . Paul de Tourtoulon kindly let me have some of his. It sprayed and covered very nicely.
I see you have fully sheeted your wings. Nice!
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11 hours ago, Paul De Tourtoulon said:
Still waiting to see it fly David,,,,,
Too wet and windy for flying today Paul!
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1 hour ago, Jon - Laser Engines said:
Mine is the now discontinued ESM/YT model. 80 inches, 23lbs and a 360v for power. Its a complete animal, just like a sea fury should be 🙂
I dont think there are any ARTF Furys available these days as black horse discontinued theirs.
I picked up an new/old stock Seagull Seafury recently and repainted it to a Dutch scheme. Also fitted electic retracts from HK and bigger wheels. Fitted with Saito 115
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Successful first flights today in 3ch propo mode. Single channel test will follow later. Model was well overpowered with it's
OS15!
The other wing just visible in the photo was my Veron Tomtit. So it was a nostalgic 70s Veron morning!
Photo courtesy of Paul De Tourtoulon
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It's slowly getting there. Need to finish rc installation now.
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2 hours ago, kevin b said:
Phew! I wonder what my Robot newly built from a downloaded plan would be worth then?
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I had one that was incorrectly wired up to the built in charging socket! Had to resolver leads inside the switch to get it working properly. Then only used in small slow model boat
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Nice to see that video. Yes, it's amazing one can have controlled flight with just one push button!
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5 hours ago, Phil Green said:
Many things are a mystery to me KC, but that particular one isnt 😀
Here we have a chap who in the full spirit of "& E" has built his own single-channel equipment, and a perfectly suited model to fly S/C. Well done David!
Well Phil, I only wired up your unit in a box with 2 switches. So I didn't do much "E" work. Still it's been fun. Thanks for making the emulator units available.
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Bit of a 70s colour scheme emerging here I feel?
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Now got the engine and tank sorted.
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2 hours ago, Graham Bowers said:
The wing is flat bottomed from the spar to the TE which makes it easier. Here’s how I’d do it.
The height of the diagonal ribs is equal to the height of the chord-width ribs at the two ends.
Probably another 5 points would do it. So mark up the chord-width rib on the plan into 6 equal parts, which gives the two ends plus 5 intermediate points. Measure the heights of the 2 ends and 5 intermediate points, so 7 heights. Lets call these H1 to H7
On a sheet of paper, draw a line of equal length to a diagonal rib and divide it into 6 as above. Draw lines / place points at a height of H1 to H7 along the length and join up the ends / dots.
Hope this makes sense.
That's what I did
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Just engines Knukle manifold
in IC Engines
Posted
I don't have the Just Engines knuckle, but I have several Saito engines using 90 degree "elbow" manifolds. Some with the standard muffler and some with flex extensions plus muffler. Most are enclosed in cowlings. None of them have overheating problems.
Is your engine really overheating? 4 stroke exhausts always do get pretty hot . Can you try your engine without the knuckle to see if there is actualy a temp difference compared to when it's fitted?