Erfolg Posted December 10, 2013 Share Posted December 10, 2013 I am still pushing on with my build, slow as i expected. I personally find this is the slowest part of the build process. Not boring, but slow, particularly as so much can depend on getting the detail right. At the moment I have just finished the hinging process. This is a bit that I find can so easily go wrong, and have observed many models with less than good control set up, which hinging is an integral part. People such as Ken and many other long term modellers, have their own favourites which are so second nature, that good out comes are standard. However many new modellers, find the process a challenge. So this is the one I use for small models. I find that on small models that top hinging is the best. I have used the Cellotape, sometimes specific products are used within the Brand, such as Crystal tape. In my case I still top hinge, but use an old CL idea, called "Cloths Horse" or "Z" hinges. This was done with oil lamp wicks, stuck on with balsa cement. I use a more modern product, "Double Sided Tape". The result is a slop free, accurately positioned moving surface. To stop the tape sticking to those things which I do not want, I use Talcum powder. I hope this does not come across as teaching your grandmother how to suck eggs. It is purely intended for beginners, as yet another method, in addition to the other methods. I am now off to instal the tailplane servo, prior to the all important links to the servos. Quote Link to comment Share on other sites More sharing options...
John RGW Posted December 10, 2013 Share Posted December 10, 2013 Quote Link to comment Share on other sites More sharing options...
John RGW Posted December 10, 2013 Share Posted December 10, 2013 Getting there gradually !. Quote Link to comment Share on other sites More sharing options...
John RGW Posted December 10, 2013 Share Posted December 10, 2013 Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted December 10, 2013 Share Posted December 10, 2013 Some fantastic looking Pushy Cats here, I like your paint job Erfolg. I've grabbed a few minutes this evening and stuck a few bits together. I like to laminate 1/64" ply onto fuselage sides, it adds very little weight and makes the fus very resilient, so I've done it here. Also I've shortened the nose and reduced fuselage length behind the wing to bring the motor forward. As well as providing the different appearance I'm aiming for, this should more than offset any slight weight increase. Quote Link to comment Share on other sites More sharing options...
Erfolg Posted December 10, 2013 Share Posted December 10, 2013 Colin, we are of the same opinion with respect to the use of ply. I used 1/32" ply, I considered 1/16", on the basis that the glue is probably as heavy as the ply. I cut the back end back to the bulkhead for the motor mounting, on the basis that it would save weight, ease motor installation and aid cooling. I convinced myself, the aesthetics of the motor being on display was good as a bonus. In my case the nose is per drawing, it seems I need the length as the Lipo is in the nose area. Although I have not done another balance check recently. I will be doing this again when all the linkages are complete and I switch out the 50 amp ESC for a 40. I do approve of the ball peined hammer with a shaft of straight grained ash or hickory. Yeh! that is what real engineers use. Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted December 10, 2013 Share Posted December 10, 2013 We frequently think on similar lines Erfolg, perhaps it reflects how long we've been fiddling with model aeroplanes of one sort or another! I thought seriously about leaving the motor out in the open, I agree that it would look rather good. In the end I decided to enclose it and will add some provision for air in and out, but it's a marginal decision. I asked a question early on about where batteries were finishing up and decided that my nose would still be long enough (fingers crossed)! However, moving the motor forward should help in this respect. I'm glad you approve of my hammer, I've had it so long I can't remember where it came from. It's probably a hand-me-down, along with some of my other useful stuff. Sadly, I will never qualify as a real engineer, but in my peculiar fashion, I continue to persevere!! Quote Link to comment Share on other sites More sharing options...
Victor Saliba Posted December 11, 2013 Share Posted December 11, 2013 I opened a new photo album of the Pushy Cat building process since it was a school project for my son. It was finished to flying order but never did as it came so nice. Have a look at my album. Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted December 11, 2013 Share Posted December 11, 2013 I've just looked at your album Victor, thank you. Nice job. Are you saying that you haven't flown it yet? Edited By Colin Leighfield on 11/12/2013 20:00:35 Quote Link to comment Share on other sites More sharing options...
Flingit Posted December 12, 2013 Share Posted December 12, 2013 I have flown a Pushy Cat for a few years now and can confirm they are tremendous fun. My advice would be keep it light rather than adding bigger motors and batteries. This will help keep the speed up in the turns. The underarm lob launch technique works very well and doesn't need a massive throw. However a word of warning, I received a very nasty cut on my litle finger due to being a bit casual and letting my arm trail after letting go of the model, rather than a continuous follow through so that fingers are well clear! Ouch!! Quote Link to comment Share on other sites More sharing options...
simon burch Posted December 12, 2013 Share Posted December 12, 2013 "This will help keep the speed up in the turns" I'm going for straight line speed !!! Cheers, Simon Quote Link to comment Share on other sites More sharing options...
Victor Saliba Posted December 12, 2013 Share Posted December 12, 2013 Dear Colin, thanks for your compliments. Since we fly from a concrete runway, unless having an undercarriage, no it is not going to fly. I flew one last Sunday with an undercarriage and it flew so nice that I might put a small undercarriage on mine and fly it one day.Thanks for watching my pictures. Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted December 12, 2013 Share Posted December 12, 2013 Victor, my pleasure. An undercarriage sounds like a great idea and if you go back through this thread you will see one. Not difficult to do and you will be able to fly off your hard runway. Quote Link to comment Share on other sites More sharing options...
Victor Saliba Posted December 12, 2013 Share Posted December 12, 2013 Thanks Colin, I will have a look. Quote Link to comment Share on other sites More sharing options...
simon burch Posted December 14, 2013 Share Posted December 14, 2013 A little bit more progress, but it's come to an abrupt halt. Had an idea for the motor, but messing around with the watt meter today, it's just not going to work. Looked at some other motors but I don't think they will fit inside the original fuselage. I've ordered a motor and will wait till it arrives as I may have to cut the rear end off and let it hang out in the wind. Only glued the wing on so far so not the end of the world. Cheers, Simon Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted December 15, 2013 Share Posted December 15, 2013 This one is fairly quick to do, so I'm fitting it into odd minutes here and there? Here it is looking a bit rough at this stage, but it gives some idea of the non (fundamental) aerodynamic changes, which make it look a bit different. I've got a sort of De-Havilland "Super Venom" theme in mind! The nose is shorter by 86mm (3.25" and the tail end of the nacelle is 41mm (1.625" less, bringing the motor forward. Overall it's 130mm (4.875" less. There's space in the nose for the Lipo to go right forward and with the forward shift of the motor, I don't expect any cg problems. I might do a bit of juggling with the detail of the boom and fin shapes, but they're only doodles on a very sound design which I don't want to spoil. I have beefed it up though, but the reduction in length should mean that overall the weight isn't significantly altered. Time is tight right now with household responsibilities while my better half recovers from her recent surgery and I need to finish off the Seafang project, but I also needed to make a stsrt on this, so I have. Edited By Colin Leighfield on 15/12/2013 09:27:11 Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted December 15, 2013 Share Posted December 15, 2013 Just wanted to make sure that the pictures came out ok. On the "Super Venom' theme, De-Havilland did actually plan such a thing for the Navy, the DH116, but like most things in those days, it went nowhere. However, it abandoned the twin booms for a conventional back end! The Pushy Cat is my opportunity for a fanciful idea of what a Super Venom might have been if stretched a bit, a little more wing sweep and perhaps a DH Gyron engine for a bit more thrust than the Ghost provided. I hope fellow PC builders don't mind my messing about with it a bit! Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted December 15, 2013 Share Posted December 15, 2013 Just to add to my irrelevant rambling (and before Erfolg notices)! I should have said Gyron Junior in the previous post! A 30,000 lb. thrust Gyron would have definitely been over the top, (bigger than the plane), but the Gyron Junior with 7,000/8,000 lb. would have been bang on for this imagined full size Pushy Cat. Quote Link to comment Share on other sites More sharing options...
Dave Miller Posted December 16, 2013 Share Posted December 16, 2013 I’m considering making a Pushy Cat and have been rooting around in the spare servo box and found a couple of Hitec HS-55 servos which are rated at 1.3Kg-cm. So I’m seeking advice as to their suitability, I ask because they are tiny 8 gram units so I’m wondering if the will be powerful enough. Any thoughts people? Quote Link to comment Share on other sites More sharing options...
Erfolg Posted December 16, 2013 Share Posted December 16, 2013 I am pretty sure that they will be powerful enough. I am using 9g servos rated at 1.2 kg. I do not know other peoples opinions, my own is that the very small servos weak point tends to be the resilience of the gear train. I have a number of Ripmax 100 servos, also very small, where I have not used other than in the smallest models, because of these fears, which may be prejudice. New 9g servos are typically just a couple of pounds. In the recent past, job lot offers would have yo 5 or 10 for £10, from some suppliers. But as some will say, there are 9g and 9g servos. The prime difference seems to be the quality of the materials in the gear train. You must have a go Dave, particularly that the official Christmas start date is upon us. I cannot testify to the flying qualities, I can say it is a well designed, economic on material build, with lots of opportunities to personalise the model. Just look at Colins Vampire. I considered a Fw Flitter, all achievable with little effort. Quote Link to comment Share on other sites More sharing options...
ken anderson. Posted December 16, 2013 Share Posted December 16, 2013 hello dave-I have a HS-55 in my latest PC....more than enough to suffice the model...... ken Anderson ne..1 .......PC dept... Quote Link to comment Share on other sites More sharing options...
Dave Miller Posted December 16, 2013 Share Posted December 16, 2013 Thank you Erfolg and Ken. HS-55's it is then; they are a pretty blue colour so that's a plus. I have started cutting wood. Quote Link to comment Share on other sites More sharing options...
ken anderson. Posted December 16, 2013 Share Posted December 16, 2013 here it is doing what it was designed to do.... ken Anderson ...ne...1 design dept..... Edited By ken anderson. on 16/12/2013 17:00:22 Quote Link to comment Share on other sites More sharing options...
Colin Leighfield Posted December 16, 2013 Share Posted December 16, 2013 I'm definitely going downhill fast. I've been struggling to understand why Ken had squeezed in a second servo and what on earth it was connected to, when it finally sunk in that it was a reflection. Ah well! I'd better go and drink my cocoa. Quote Link to comment Share on other sites More sharing options...
ken anderson. Posted December 16, 2013 Share Posted December 16, 2013 ................ Colin forget the cocoa...and have a firewater....... ken Anderson ne...1 ....... medicinal dept. Quote Link to comment Share on other sites More sharing options...
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