David Davis
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Posts posted by David Davis
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1 hour ago, toto said:
The force .46's will have their day ..... 😄
I'm glad to hear it but then I'm an engine man and appreciate the challenge of setting up a well-tuned engine.
I understand why novices prefer electric motors because they are eminently reliable, smooth, quiet and clean.
For those of us who don't mind getting outr hands dirty, i/c engines are our preferred power source if only because on a pretty standard tank you can fly for twenty minutes if yiou want to, ideal for training beginners. That said, beginners get tired quickly having to concentrate for long periods. Us Greybeards had to get to grips with i/c engines in the old days because electric propulsion was in its infancy. I/c engines are not difficult to master. On a two stroke glow, there are only two needles to adjust. I look forward to hearing of your experience of learning to use i/c engines, meanwhile, keep up with learning to fly on electric models.
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Toto, the Boomerang kit comes complete with all of the parts for mounting either an electric motor or a proper engine. Don't you have a 46 two-stroke somewhere? It could be a challenge for you once you have learned to fly.
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I now have an OS 46AX in the club's Boomerang. I picked the engine up for a song at a car boot sale, minus the silencer but I found one amongst my souvenirs. I didn't want to risk my beloved Enya 50 in the clumsy hands of incompetent beginners.
I recovered my Boomerang's fuselage and tailplane last year as it was starting to look very scruffy.
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I recall that at 12 or 13 years of age I had built a Veron Cardinal, free flight in those days, a servo was about a month's wages! It was the third model I had built, the other two, a Keil Kraft Ajax and a Keil Kraft glider were not successful but I was hoping for more success with this model. I had decided to cover the wings in yellow tissue and being one of the awkward squad I just had to paint the fuselage purple. Trouble was there was no purple dope in those days so I mixed red dope with blue dope and it came out brown! So I took my brown and yellow Cardinal to show my Uncle Geoff. He had taught me how to build but he was in the last stages of cancer at the time. A few days later my father, his brother and I went to an abandoned airfield. There was no wind and the trusty Mills 75 started up straight away. I filled that little thimble of a tank and the model climbed until it was a tiny dot in the sky before the fuel ran out and the Cardinal glided downwards in circles to land just a few yards from us.We had several flights like this
I can still see the sun shining through the yellow tissue. If it hadn't been a success I would not be typing this now.
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2 hours ago, Fly Boy 3 said:
In suitable weather I fly my Super scorpion with the much maligned MDS engine which over the years has proved faultless. Built in 1973 I call my “best “ flier lol.
Purely from observing the tribulations of others, I have to say that the majority of people who bought MDS 18s or 38s were quite satisfied with them. As for the rest of the range, they are in my opinion, justly much maligned.
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11 minutes ago, Lipo Man said:
Was flying my foamboard ugly stick hack having a great time yesterday. I was doing so well I tried a rolling circle with some limited success. So I tried again, only lower…
The wing was undamaged, so today I’ve hacked out a sort-of Extra style fuse so I can still fly the wing. Waste not, want not!
What did you use for the yellow covering?
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I went flying last Sunday. I took three models with me, both Barons and the club's Boomerang. I didn't arrive at the flying field until 5pm so things were rather rushed.
I had been having problems with the British Baron; the caburettor barrel on the Magnum 52FS insisted on making a break for freedom so rather than fit a carburetter from the spares box I swapped the engine for an OS 52 Surpass. I found that I could not stop the engine. Closer investigation revealed that the part which secures the bottom of the carburettor manifold had snapped off so the carburettor was flapping about in the wind. Fortunately I have a scrap OS52 at home so I was able to use parts from that engine to repair it. A quick session on the test stand, a swift adjust ment of the slow-running jet and all was well. I just have to fit the engine back into the model.
I had a good flight with the Ukrainian Baron but forgot to switch elevator to full rates on landing so the landing was a bit hot. No damage though.
As for the club's trainer, a Seagull Boomerang, last year I bought an OS 46FX at a car boot sale minus the silencer. I had previously been using my beloved Enya 50 in the model but the thought of ham fisted beginners wrecking my Enya while learning to fly led me to fit the OS. I have a box full of two-stroke exhausts so I fitted one. The OS flew it more than adequately.
Although I'm not really an ARTF man I have recently bought a Kyosho Calmato Alpha, new in box. I intend to put the Enya in that. I have a Q Silencer on the Enya and to my ears it sounds fabulous...for a two-stroke that is!
Copious amounts of rain are forecast here right up to Sunday so I'll plenty of time for assembling the ARTF and building some other projects.
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7 minutes ago, Geoff S said:
No, Erewash Valley born and bred. DH Lawrence was born in a house about 200 metres away from ours. 'Nesh' is a common expression in the Derbyshire/Nottinghamshire region.
We live and learn.
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9 hours ago, Geoff S said:
Interesting - I thought at first glance there was just one servo! I'll soon have 4 unflown models mostly because of the persistent rubbish weather. From being a hardy type I've grown nesh in my old age.
Sorry no good with computers!
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Are you a Shropshire Lad Geoff S?
I've always thought that the term "nesh" was unheard of outside of Salop!
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Thank you for that suggestion Tim, I'll try it out.
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True Line Custom Executive or Senior Executive?
Cambria Instructor?
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The name didn't begin with a V did it?
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I turned the model the right way up and got this result. Neither the rudder nor elevator servo has been installed yet neither has the rx battery but putting the pilot into the cockpit, even in the most advanced position, causes the model to tip over.
Some cosmetic work to do too.
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6 minutes ago, GrumpyGnome said:
Carbon rod/tube makes a nice light, stiff, strong pushrod....
I've got some in stock. I'll use one.
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38 minutes ago, cymaz said:
Balsa dowl would be easier to fit but unless supported in a couple of places will rattle like a spoon in a bucket. Even worse for a snake. Are you able to open up the bottom of the fuselage to do the necessary works ?
Of course. I built the model I can chop it up again! Besides, having removed the two servos from the rear fuselage I now have two holes which will give me access to the rear fuselage.
Having removed the two servos and the rx battery, the c of g was much better, in fact I'd be quite prepared to fly the model with the c of g in this position. I thought of having one servo under the wing and the other at the rear but as soon as I put one of the servos back into place we went back to a rearward c of g.
So I will mount all three servos side by side then use the rx battery to fine-tune the balance point.
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Good Morning Gentlemen!
Having borrowed the club's c of g apparatus and set the pivots to 4 inches (10 cms) from the leading edge as recommended in the instructions, I put the model in place and as we suspected it was very tail heavy even with the rx battery taped much further forward than one could realistically fit it. I am in the habit of keeping various bits and pieces of my latest build in a tin which once contained Twining's tea. The weight of this tin and it's contents amount to nearly 12 ozs (340 grammes.) With the tin placed on the nose it brings the c of g to an acceptable position.
The most obvious next step is to move the two servos from the rear fuselage and to reposition them next to the throttle servo. I will use a closed loop system on the rudder but I'm not sure how to actuate the elevator. I'm considering either snakes or a balsa dowel. Whichever I chose, I'll have to send off for them.
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Paragraph 7 in the "Wings" instructions. Part 39.
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The fillet is part of the kit Ron. Have a look at Cloud Models version which inspired the scheme I chose, or Galaxy Models own picture..
Yes I noticed the servo lead. The receiver is not installed.
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After weeks on very little activity I have made considerable progress in the building of the Mystic over the last few days mainly by laying off the vino! The white undercarriage from Carbon Copy turned up and it's a lovely piece of kit however, it looks too small for the model. This is my fault for not reading the dimensions properly. A rather heavy undercarriage from my WOT 4 XL, which went up in flames in the Great St Valentine's Day LiPo Explosion was fitted and I the rear wheel assembly was taken from my ARTF Acrowot which I landed in a tree, depth perception not being my strong suit! I'm not sure it's heavy enough for the job. All of the control surfaces are now hinged and the servos have been installed. I am trying out Savox metal geared servos on the control surfaces for the first time. They seem to be well made. I still need to make a hatch for the underside between the firewall and the main former.
However, last night, with the engine and all servos in place and the rx battery temporarily taped into postion, I decided to check the centre of gravity. I was expecting the model to be nose heavy because the Laser 155 is so much heavier than a 61 two stroke for which the Mystic was designed. However, I found the opposite to be true, it's tail heavy. None of the horns or pushrods have been fitted but they will only exacerbate the situation. I suppose I could add lead to the nose and remove it after flight testing. Alternatively I could move the rudder and elevator servos from the rear fuselage and install them in a more conventional position above the wing alongside the throttle servo. I will borrow the club's cg contraption to ascertain the precise position of the balance point because I've only been able to use my finger tips so far.
At the moment the undercarriage is bolted into place with nylon bolts. Would steel bolts be a better option? My landings are not too bad these days but my first landing with this model will be its maiden landing and if I cannot manage to land it on our 8 metre-wide tarmac runway, there's a fair chance of my catching a wheel in a mole hole in the grass strip alongside.
As ever, the views of the cognoscenti are keenly sought.
PS. The cockpit is only resting in position in the picture below, it's not glued in place. I was expecting the model to be nose heavy so bought a pilot. He is quite big and heavy but I suppose I'll have to leave him out now that the model has turned out to be tail heavy.
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I got the dimensions from an advert on a French model shop's website.
https://www.flashrc.com/en/radio-controls/48657-radiomaster-tx16s-mkii-max-red-16ch-2-4ghz.html
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I've been thinking of buying a Radio Master TX 16S for some time but the price of central heating oil has prevented me from actually buying one! Several have mentioned that the 16S is very large, 287 mm x 129 mm x 184 mm according to the specs. That's 11.3" x 5" x 7.2" for those more used to Imperial measurements. I assumed that 129mm (5")was the depth of the box then it occurred to me that it must include the length of the sticks as well! My Spektrum DX9 measures 180 x 102 x 170 including the length of the sticks (7" x 4" x 6.7"). The Radio Master also weighs 150 grammes or 5ozs heavier.
Is the Radio Master Pocket transmitter compatible with Spektrum receivers?
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Perhaps polyester over doculam would save on dope.
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I would have thought that a heavy model would be more stable because it would be less likely to be blown about in turbulent air than a lighter one.
Apparently my Barons are heavier than they should be. I'm hoping for a bit of a breeze in la Coupe Des barons in June! 😏
Of course a heavy model with a cg too far to the rear would be a handful!
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Seagull Boomerang Trainer Experiences.
in Beginners
Posted
I have no objection to people powering their Boomerangs with electric motors. I just prefer glow engines myself, especially four-strokes but I'm not going to fit one of my beloved four-strokes into the club's trainer for some ham fisted beginner to wreck if I don't take back control quickly enough! 😉
PS. The last two Boomerangs which I assembled had all the parts to fit either an i/c engine or an electric motor.