Ian Mat
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Everything posted by Ian Mat
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Rosco, that's a great idea! I didn't think of that... I will try that if I can successfully make the protruding side fit within the skin.
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John, the wood part if the bearer shouldn't be a problem, it's the metal part of the retract I'm more concerned with... I don't think removing the visible metal corner will cause to much of an issue.
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The first two photos are from the good side, as you can see the retract mount rail is flush with the curvature of the rib and will be covered by the skin. However, the other side protrudes by about 3mm: I can't believe I didn't spot it while I was gluing it all together... I think I can probable take the edge off the retract unit and chamfer the mount rail to suit the wing profile. I will be able to make the undercarriage legs the correct length so the model sits parallel to the ground and I'm not sure anyone will notice one leg being 2 - 3 mm longer than the other!
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Martyn, I've had another look this morning and think that I might be able to chamfer the edge of the retract unit slightly. I will take some photos when my phone is charged and post them on here later today.
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I hate it when I make mistakes like that... It's soul destroying, but it looks like you've recovered well... keep going, the build so far looks great.
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Very frustrating day again... Spent a good 3 hours fitting the retract units, so that they were perpendicular to the wing and straight with respect to each other. In my opinion, this is the worst part of the design so far... It's extremely difficult to get the units lined up and very little guidance in the manual. Anyhow, I eventually got to a position I was happy with and epoxied the supports in place, double and triple checking all the way. I left it for a couple of hours to reach the point when I could remove the retract units (just in case there was any epoxy on them) and realised that one of the units was about 3mm higher that the other. Not a big deal, apart from the fact that one of the retract unit forward edges now protrudes slightly from the profile of the wing... I'm now starting to doubt my ability to complete this model
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Made a start on the wing yesterday and I must confess that this has been my least favorite part of the build so far. Extremely fiddly, very frustrating and when I thought I'd managed to assemble a straight central wing skeleton, I discovered that I had glued two of the ribs in the wrong positions... Thank goodness that I'd used aliphatic glue, which hadn't fully set! The main components, all assembled ready to form the central part of the wing. This was the easy bit! After a couple of hours of hair pulling, swearing and very nearly throwing the whole lot in the bin, especially when all the balsa ribs split when I drilled the aileron pushrod holes, I eventually ended up with this... It all seems square and fairly rigid. Next job will be trial installing the retracts and from what I've heard, this part is crucial to the correct operation of the retracts.
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Mr B flies at the same club as I do and he has plenty of experience in rebuilding Saitos, so we will take a look at it sometime next week! I'm hoping it's just duff bearings, because the engine runs beautifully apart from that.
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Djay, I'm building as light as I can. I've read on a few other forums that the Robart retracts I'm using don't like much more than 10lbs total weight, so I'm aiming for less than that. I usually use receiver batteries as forward ballast and put them under the fuel tank, which usually saves having to add too much lead in the nose. I'm also going to cover the aft control surfaces in tissue rather than the heavier solartex option I'd considered.
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Mr. B. Its not end float, it definitely side to side. You can feel it when you grab the prop and rock it. I reckon the guy that sold it may have crashed a model a damaged the bearings. The rest of the engine is fine. I might bring it tomorrow and ask you to work your magic on it. I reckon its definitely worth saving!
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I recently purchased a Saito 100 from Ebay to put in the Top Flite Corsair I'm building. I ran the engine as soon as I received and all was well, huge amounts of compression, tons of power and smooth tick over. I was very pleased, especially for the price I paid, however I did notice that there was a tiny amount of side to side play in the crank shaft when I was turning the prop... should I be concerned?
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Robert, I'm think about attaching the air tank to the wing, I've seen a couple of other people do the same on other builds. It reduced the need for connecting/disconnecting pipework each time the wing is removed and therefore reduced the chance of leaks. The tank hasn't arrived yet so I've decided to park the fuselage for now and start building the wing.
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Slow progress over the last few days, due to work getting in the way! I've added the lower fuselage formers and the pushrod for the rudder and tail wheel, which required soldering and meant that I had to quickly learn a new skill. In fact I brazed the thicker steel and brass connectors and soldered the thinner ones. I'm not sure whether to sheet the rest quite yet, because it will severely restrict access to the interior of the fuselage. I can't see any reason not to leave the final sheeting until I've finished the wing, which I'll start next, unless anyone has any good reason?
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Freewing (Hobbyking) 1600mm B-17
Ian Mat replied to Paul Marsh's topic in Build Blogs and Kit Reviews
How do they fly? I love the foamy war birds but have found that some of them have compromised handling despite looking great.
