Here is a list of all the postings Geoff S has made in our forums. Click on a thread name to jump to the thread.
|Thread: America's Cup|
Just watched this latest race and it looks like Ben Ainslie's team are well on course to be the challengers for the Ameica's Cup itself against Team NZ. It was a great race with lots of lead changes which is quite rare in AC match racing in the past.
I thought the last leg was espeicially interesting, particularly the port/starboard incidence and the subsequent rejected protest by Luna Rossa. In fact I think Ineos could have counter protested because Luna Rossa bore away when she should have held her course (unlike windward/leeward incidents where, after the start, the leeward boat is permitted to sail has high as she likes and even make contact). They must have lost out by losing speed by bearing away as they ended up 33 seconds down on the line.
I knew someone wh'd had an outing in a 12 metre America's Cup Yacht. He said the difference in apparent wind between down and upwind was remarkable but that's probably not the case with these foilers. Thy're close hauled everywhere because they go so fast the apparent wind is always way forward - almost like an ice yacht. They're fantastic.
Will the next AC be held on the original course round the Isle of Wight? Probably not, but it may well be held somewhere off the s coast of England
|Thread: Is the hobby dying/dead|
The main problem with that, is, that in the UK, there are very few model shops and they're getting fewer. When I took up the hobby after retirement there were numerous shops within a bike ride away now there are none.
I learned with a buddy box both with the trainer I built (though that was mostly grab the transmitter ) or with an instructor's trainer who charged a modest fee. That had the advatage that I got a bike ride going to the airfield because I didn't need to take anything with me. Both models were 4 channel and I don't see any advantage to flying rudder/elevator/throttle models either - 4 channel models of the right type seem quite stable enough.
I find it difficult to believe there's a magic fromula that would have speeded up my learning when the main difficulty is orientation - particularly with the model coming towards you. I still find it amazing that I never even think about it niow - and I'm not nor ever will be a hot-shot model pilot but I can and do test fly my own models.
|Thread: Aliexpress VAT charges|
Whilst the bigger suppliers like Amazon etc will find it worth registering for UK VAT smaller ones will find it too onerous. So a lot of the specialist model shops/suppliers in the EU will opt out of selling to the UK and concentrate on their bigger market within Europe. Certainly for those that do continue to supply UK buyers the recipients will have handling charges on top of VAT/duty which is likely to increase the price significantly.
It does look a very pretty model and beautifully built.
I noted Matty's comments re the rudder hinge's being sloped back. I know little about aerodynamic design so I may be right off the beam here but I had a similar experience with the first 1 metre model racing yacht I had. It was a very nicely built own design I acquired s/h from the builder. I had an awful lot of trouble with direction control down wind in heavy weather and that had a sloping rudder hinge, too. It made the rudder very heavy because of the forces behind the hinge. I redesigned it with a vertical pivot about 1/3 of the way back from the rudder l/e and it was very much better.
I'm probably wrong but it struck a memory chord.
|Thread: America's Cup|
Indeed . I noticed the iPads everyone seemed to be using on board, presumably for weather and other data. I feel the electronics diminishes the sport just as radio diminishes big cycle races.
We usually sailed on inland reservoirs but the nationals every year were held off shore because of the numbers (fleets of 80 to 100+) racibg. I used to study the tidal atlasses in an attempt to decide which side of the beat to go for - not that it did me much good. We were definitely middle of the fleet racers but enjoyed it greatly, though terrified at times. We tacked on the shifts but I'm sure that when my wife got tired on one tack she'd ease the jib sheet a bit so I though we'd been headed and tack
Not sure I'd enjoy the beat/run courses they sail now. The triangular courses were fun with a couple of fast reached with a gube at one mark but I suppose the run is more tactical and certainly trickier in a slower dinghy where a more direct course is faster. It's certainly hairier in a Laser.
Well it's considered a posh person's sport, I guess. They obviously have never seen our first sailing club on a green reservoir in Sutton-in-Ashfield that was so polluted you kept your mouth firmly shut in the event of a capsize and buying new sails considered tantamount to cheating We provided some entertainment to the hospital across the road though.
I think if we'd capsized because I hadn;'t uncleated the main sheet properly it would be down to poor boat handling either by maintenance or on the water. Not freeing off a backstay is an error one way or another. They are fantastic boats though. I've crewed a 54' ferro-cement ketch 2 handed with 40kts of wind across the deck but we were making about 6 kts to windward not 30.
I've just spent a few happy hours watching this weekend's races and ejoyed Ben Ainslie and his crew's successes as well as American Magic's poor boat handling that turned probable victory into a capsize (fortunately without injury to the crew).
But the most annoying thing was seeing crowds enjoying the spectacle close together and not a mask in sight. Jealous? You bet!
The rules have changed a lot since the early days of the competition when yachts were required to be crewed by nationals of the challenging club (ie British in those days). Now the New York yacht Club have hired a Kiwi to steer their yacht. Moreover the boat and all equipment was supposed to originate in the home country but I noticed Britannia was using North Sails, which I'm almost sure are US manufactured. Also the challenger was required to sail to the venue (ie across the Atlantic) which was something of a disadvantage but that changed a while back fortunately.
Thanks for reminding me about this. As it gets zero reporting in the media I'd totally forgotten about it. Makes a pleasant change from reports about the pandemic and lockdown.
Edited By Geoff S on 17/01/2021 20:35:59
|Thread: NEW POLL - has the covid pandemic deterred you from attending shows and events in 2021?|
Certainly the economic damage is great but it's world-wide so it doen't put any country at a huge disadvantage compared to the rest. I'm not sure if that helps but it must be better than a huge hit just to one.
The worst is the way it's affected those who were already struggling and can't afford to self-isolate - a choice between staying Covid free and eating isn't one I''d like to make. Others, billionaires in particular, have seen their wealth massively increase. Because we haven't been anywhere for months we're better off than we wuld have been so our problems are mental rather than financial - fortunately my wife of 53 years and I still get on pretty well
|Thread: America's Cup|
I certainly am. My major sport for years was dinghy racing and the history of the America's Cup has always interested me. Though I much prefer fleet racing to match racing. The latter is a very rare branch sport only used for the Cup but is probably all the general public knows aboit sailing.
I wasn't very enamoured of the catamaran era but these monoll foils are something else. I should think we rarely exceeded 10kts on a good spinaker planing reach with our Scorpion but it felt like flying, what it must be like sailing the current yachts I can't imagine. I have a picture of the J class Endeavour and one of the 12metres Sovereign racing l'Esprit d'Equip 2 to windward on my workshop wall. Much prefer the 12 metre era but things move on.
After all sailing is actually horizontal flying using fabric aerofoils Peter Scott, the naturalist, was a competitive glider pilot and invented the trapeze for dinghy sailing in International 14s.
Edited By Geoff S on 17/01/2021 11:29:44
|Thread: I could be the only one|
I miss flying a lot. I've also lost some of the enthusiasm for building (I've been idling for a couple of weeks) mainly because without being able to fly what I've built makes it seem a bit pointless. I think it may not be just the flying I miss but the social contact at the fileld - it's the only place I meet or speak any club members so I'm fairly solitary. I also seem to be losing concentration in that reading a full length book is a chore and I've been an avid reader since I was 7 or 8 - over 70 years.
As to remaining a member of organisations I generally keep them up. I'm still a member of the YHA despite not having sayed at a hostel fro years (we used to spend every Christmas at a Lakeland hostel - mostly Patterdale). I'm still in the the CTC (now CyclingUK) despite riding a lot less than formerly but we've let our Tandem Club membership lapse which is a big thing because I was on the committee for years and edited the magazine. We were regular attenders (and organisers) at numerous international rallies.
Things change, we get old, pandemics limit our lives. It was ever thus, though we don't realise it until we happen to look back and see how creeping changes have suddenly resulted in big changes.
I also love the sun (not so keen on the Sun ) but preferbaly spring/summer sun because in the winter it gets in my eyes and I can't see.
|Thread: NEW POLL - has the covid pandemic deterred you from attending shows and events in 2021?|
I'm just sitting tight and hoping for a return to some (limited?) return to normality in late spring and summer but that's all it is - hope. I'd like to go to a few shows and especially an RCME fly-in at Buckminster, which I enjoyed greatly in 2019.
Mask wearing in in eastern countries like Japan and Korea was common before the pandemic but it was because of air pollution rather than viral transmission. If we're asked to wear them at times in public to prevent another pandemic then I'll comply. I'm sure better, more comfortable masks will be marketed and make it less uncomfortable.
|Thread: My HERMES|
I think it depends on your local employees. My experience with Royal Mail is very positive but that may be because our postman is so helpful. Not had any bad experiences with other carriers and we often take in packages for our neighbours when asked.
I avoid buying through Amazon wherever possible but that's for other reasons than delivery. It could be argued that Amazon is a much bigger monopoly the Royal Mail.
|Thread: Repair advice please|
Certainly replace the clevis because they're totally unrepairable. IMO they're useless even when new and I would never use one on a 'proper' model and I understand the carbon Cub is quite an expensive ARTF. Assumimg the push rod has a 2mm thread then replace it (and all the other clevises with stainless steel ones. They're widely available. In fact I bought 10 from Modelfixings last week.
|Thread: Watts/lb misleading?|
Hah hah. Those 'r' s seem to slide in unnoticed. But I am quite pleased about it and it was great being the youngest in the room for a change (Avice was 80 last Oct and I was 81 earlier this week) and we walked 3 miles each way in the sleet/snow so I'll crow about that, too. At least it was warmed up a bit from -70 deg C which was just as well considering how horrible today's weather was.
The new set up for your Junior 60 is the sort of thing I'd do, too, though I've never really had a vintage style model. I'm sure it'll work as well as you expect.
|Thread: Where do you get your Lead from ?|
The plumber across the road, although I think most of mine came from repairs to our roof he did. I need quite a lot for the dummy/cheat keel on my 45" waterline Thames sailing barge if I ever fit out the completed hull. I've used about 1.5 kg in the cowl of my Sopwith Pup but I've still got a lot left.
'Real' barges are flat bottomed so they can take ground in the upper reaches of the east coast rivers for loading and unloading and use lee boards to stop them sliding down to leewards when sailing but models have to have a keel with a lot of weight to get the displacement right.
Car wheel balance weights aren't lead these days. I think they're steel. I usually ask for a few whenever I either buy new tyres or have puncture repaired.
|Thread: Watts/lb misleading?|
Not sure if your description of your Flair SE5a as 'lovely' was intended or if it was a typo for 'lively' but my similarly powered SE5a's performance would fit both. Though mine is quite a bit heavier at almost 7lbs in both glow and electric versions.
Unfortunately I haven't been able to fly it since the conversion but it's turning a 12x6 prop at around 8500 rpm, about the same as the OS52 did. It's also on 4S but didn't need any of the lead ot needed in its glow form, mostly because the battery (4S 4AH) is right at the very front over the motor. IIRC the power is also about 700 watts which is the magic 100 watts/lb and probably far more than is needed. I'm looking forward to its test flight whenever. I had my Corvid (Pfizer) vaccination today, so here's hoping
As several have already said- it's just a guide. Moreover the 100 watts/lb rule of thumb was used when electric drive trains were rather less efficient with cheap brushed can motors being the most commonly used. My Ballerina, for example, flies as well as I need on about 80 watts/lb.
I've converted a few models designed originally for glow to electric power and the electric drive trains tend to be lighter. Unfortunately, the model as a whole has to be the same or a similar weight to when it was glow powered because it still has to balance in the same place. The only way to reduce the weight and take advantage of the lower weight of the motor/battery combination is to lighten the tail or lengthen the nose (difficult in a scale model).
I like to have the potential for greater power by choosing heavier motors and higher current escs but prop for more modest power. The flexibilty of electric drive trains is both an advantage and a problem because it confuses until properly understood. But isn't understanding part of the attraction?
|Thread: DH71 by Chris Golds|
Thanks, Bob. It is a bit of a puzzle but I like puzzles and it'll no doubt become clearer when I actually start. I just like studying drawings of a model I intend to build. At least the print quality is excellent.
I wonder if Chris Golds is still available? He's a very talented guy - Hunter pilot, artist and aero-modeller. I once wrote a joky letter to him about a humourous article he wrote and got a beautifully hand written reply.
That's what I was thinking, Bob. The elevator and rudder servos are near the tail, too, so I could lighten the back by moving them forward and use my normal 3mm carbon push rods which are quite light. I canalso install more watt.hours of energy for longer flight times and (hopefully) save weight at the same time. It's amazing how electric flight options have improved since even this was designed.
This is what's puzzling me on the wing construction:
The Xs in circles indicate where so-called building jacks go. I'm assuming I need to make those to support the spars at an appropriate height. The trailing edge near the root is raised 1/2" and near the tip (just before it starts to curve) is 1/4". As the mainspar is 0" and the LE jacks are both 1/4", doesn't that indicate wash-in?
There is non-scale dihedral (the full-size's wing is flat). The dihedral braces I've measured at 4 deg/side. There is, however that piece of 1/4" ply labelled as Building Jack which is at an angle of 2 deg along one long side and square everywhere else. One end is labelled 'Forward' so I guess it goes across the chord - perhaps that's something to do with dihedral and perhaps I need 2 of them (one at each end when I join the wing halves.
I've built a lot of wings but this is a new technique to me. Perhaps once I get the parts cut out and do a dry assemble it'll be obvious how it all goes together.
These are the wing building instructions printed on the drawing:
Having been reminded about the DG71 by the recent build of the JB Aviation kit by Robert Parker I decided to see about building one myself and I ordered the drawings for Chris Golds version from Sarik. It arrived this morning. I regret delaying too long to buy an unstarted JB Aviation kit at a swap meet. When I went back it had sold.
It comes in 2 huge sheets on very stout paper and, in addition, is a printout of the original article which appeared in Q&EFI in December 2006. So lots of information and there's more , including instructons, on the drawings themselves.
It's 5th scale but still only 54" ws so it's a small model of a small full size. It's also electric - another plus for me. Chris used an Axi 2820-14. I'm using one in my Peter Miller Li'l Cub so I'll have an idea of its performance though I'll probably substiute a different motor - I have an unused Turnigy G46 which might serve. The energy is provided by a 10s 3AH NiCad pack which is roughly the equivalent of a 3S 3AH LiPo but a lot heavier. I may go for 4S 4AH LiPo.
There are some odd aspects of the design I've not yet sorted out but no doubt will become clear. This is now next but one on the bench after the Rans 9 Chaos. I'm looking forward to it. I have avery soft spot both for the era and DH aircraft in particular. The design calls for mostly soft balsa throughout which may well be a stumbling block as I don't think my stock is sufficient.
In 2006 the drawing was priced at £20 + £3 postage. This was £23 plus £3.50 postage, so really not too bad.
More in a few weeks
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