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Model Forum / Radio Controlled / Air Models / September 2006One last question on FS engine for Flair Puppeteer please.
Hello again. Sorry to labour this point (and I know this has been asked before), but I would like your final advice before ordering a new engine for my Flair Puppeteer. I have 2 options. The first is an O.S 52 Surpass fourstroke. From what I have read this seems like an adequate engine which will fly the aeroplane around with relative ease. I know someone in this NG recently bought a .52 for his Puppeteer. The second option is an OS FL 70 fourstroke, which I can buy at virtually the same price as the .52 Surpass. There are pros and cons with both choices. The FL 70 will swing a bigger prop than the .52 (and do I like the idea of a 12" or 13" prop with the large cowling of the Pup)... BUT... the FL 70 seems quite a bit larger than the .52 surpass and I wonder if the FL 70 would even fit inside the engine cowling? Also, the FL 70 is longer than the .52 so I wonder if too much of the engine would be sticking forwards out of the cowling. In other words, am I mad thinking of a .70 in a Puppeteer? I don't want to modify the plans if I can help it. I'm making a good job of this build so far, but I am not an experienced builder. Any expertise around you can share with me would me breatly apprecoated. TIA. I cannot decide which way to go. Travec. > Hello again. Sorry to labour this point (and I know this has been > asked before), but I would like your final advice before ordering a [quoted text clipped - 22 lines] > > Travec. My advice: go with the OS 52. It will swing the propeller size you mention without trouble, it's got plenty of poke and it'll fit nicely into the cowl. Steve > Hello again. Sorry to labour this point (and I know this has been > asked before), but I would like your final advice before ordering a > new engine for my Flair Puppeteer. > > I have 2 options. The first is an O.S 52 Surpass fourstroke. The OS52 FS is the classic engine for the Puppeteer, don't waste your money on a 70 you're not building a pattern ship 8-). Greg >The OS52 FS is the classic engine for the Puppeteer, don't waste your money >on a 70 you're not building a pattern ship 8-). Thanks guys.. it's the .52 FS for me then. Travec Phew, thank f##k for that then !! >>The OS52 FS is the classic engine for the Puppeteer, don't waste your >>money [quoted text clipped - 3 lines] > > Travec >Phew, thank f##k for that then !! Haha that's what I said too! Engine now ordered... at last. >Phew, thank f##k for that then !! >aha that's what I said too! Engine now ordered... at last. Now all you have to decide is how to make even this smaller engine fit in the cowl. The plans suggest that you cut the firewall and side away, and fit the engine further back. This has the problem that you are moving into the tank compartment, and the plans also say you will have to add weight to the front, which I never like doing I have extended the fuselage sides on the one am building, by laminating some 1/64 ply bands together. and making some supports on the firewall to provide support. These ware glued to the firewall. The balsa side sheets are not actually fitted to the firewall but are glued to some scrap 1/4 I fitted to the back of the firewall. Its also a good idea to make sure the gap between the engine bearers is done before gluing in place. I did do that bit, but have subsequently found that a further 2 mm have had to be removed form the "height" as the rocker cover was very close to the cowl. You haven't asked about the ailerons yet, but I am guessing you will, I finally got the last one correct, although all the other 3 where correctable, without having to build new wings or ailerons. Paul >Now all you have to decide is how to make even this smaller engine fit in >the cowl. Thanks for that input, Paul. All is noted and I will bear all in mind. I hope to receive my engine in the next week or so and I will check what you say about the length of the forward fuselage. I have heard of a few people adding length to the forward part of the fuselage so that the engine can be fixed to its bearers without sticking out too far in front of the cowl. I presume (am I right here?) that there is no really huge structural strength required in this extension, as all it really has to do is support the cowling? Do you have any photos of what you are building, re the stages you are at, etc? I would value an exchange of ideas with you via email if that mught be possible (2 minds better than one, etc)? Regarding the wing ailerons, what seems to be the problem here? I haven't started on the wings yet (was leaving them till last) but I am keen to know what pitfalls await me. So far I have constructed the fuselage (except engine bearers and possible extension), and the tail assembly is almost complete and ready for covering. Was planning to start on wings next week. Thanks Travec >I presume (am I right here?) that there is no really huge structural >strength required in this extension, as all it really has to do is >support the cowling? As you say, the extension has to be strong enough to support the cowl, and the should provide an area where the covering can adhere to. There is always a fair amount of vibration from the engines and 4 strokes, I believe are a little worse than 2 strokes for vibration. I will take a couple of photoes and send them to you tommorow. >Regarding the wing ailerons, what seems to be the problem here? I >haven't started on the wings yet (was leaving them till last) but I am >keen to know what pitfalls await me. I have covered the wings now so I can not send you any pictures of the ailerons. The trick for me was the placing of the ribs, the trailing edges, the aileron end part 73, and the cap strips. For the wing ribs at each end of the aileron, the cap stips are placed on the edge, rather than the centre of the rib, and the wing end cap strip runs to the trailing edge of the wing and then has the trailing end strips butted up to it. Part 73, the aileron end then has its cap strips about 1.5 mm away from the ribs with the small cap strips again on the ends not on the center. Hope this makes sense. Regards Paul >I will take a couple of photoes and send them to you tommorow. You'll need my real email address, Paul. It is virinospam@talk21.com but remove the 'nospam' part. Thanks Travec |
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