
Martin McIntosh
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Everything posted by Martin McIntosh
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No they were not, but saved doing expensive damage to the motors which were tuned to perform way over the revs which the manufacturers intended.
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On my last flight at the 1977 F3A W/C the motor went very quiet just after take off. On inspection the plug element was completely missing. The OPS rear bearing picked that time for its cage to start to break up. Well worth the effort to strip down your motor and consider fitting new bearings, even if they look fine. I used to replace the bearings on HP/Webra/OPS every six weeks of intensive practice. (Four flights a day, four days a week)
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Well, almost all of my stuff is JR DSM2, 3x DSX9 plus a 9X2 other than a Taranis set which I do not get on with and a TGY 6i and 10i which I no longer use. Quite a lot of RD921 Rxs plus Spekky AR 7000, 9000 and very many Orange 9 ch plus some 6 ch ones. The Orange ones are still available from HK and are DMS2 and DSMX compatible. The BMFA for sale site lists many JR/Spektrum Rxs with satellites at very reasonable prices. Nothing much to wear out on a DSX9.
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Clear canopy wanted for the 64" version (original size).
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Struggling to get this connector needed for motor
Martin McIntosh replied to shepeiro's topic in Motor Discussion
Shepeiro, PM me if you would like a roll of proper 60/40 solder for future use. -
Struggling to get this connector needed for motor
Martin McIntosh replied to shepeiro's topic in Motor Discussion
Looks like a Parkzone one which I was recently after. Blew up the Rx when trying to codge it. -
If you have electric retracts then these should shut down if overloaded, otherwise use a separate pack.
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At one time I would have used a 4.8V NiMh pack but a 6V one gives insurance against a cell dying ( they go s/c when they die). I would avoid Lipos because you really should put them to storage level after every session; not practical for an i/c model. My `go to` now is 2s Life. Even a 700 mA/hr pack with your stated set up will last for many flights. 1100 or 1800 better still. Most servos these days are quite happy on 6.6V. Unfortunately HK have not had many of these in stock for a long time. When they did the prices were a small fraction of the cost of other types (£2.50 for a 700 for instance). They maintain their charge at full seemingly forever when not in use.
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Nothing beats pins for holding stuff down properly.
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You need something that you can easily push pins into using a blunted pair of wire cutters. When I built my new workshop in 2001 I obtained two benches 6`x3` to which I glued 3 or 4 mm lite ply. Should have used 6mm. The benches are metal framed and nice and flat. I would avoid magnets depending on what you intend to build since a wing for instance often needs to be left overnight while the glue sets. Never looked back on this set up.
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Wanted. Innards from a crashed Parzone model, motor Rx etc.
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Finding a Controller PCB for these Retract Units
Martin McIntosh replied to Futura57's topic in Gadgets and Electronics
Plugs could be micro molex. If so then you would need to source sockets and pre crimped wires; not worth the bother. Exactly what is the length and width of your boards please? I may have some to fit but if you wish you could send me the stuff you have for me to look at. I have, in the past, replaced broken limit switches and am (was?) fairly good at repairing/modifying servos etc. Very similar to what I did at work everyday. -
Finding a Controller PCB for these Retract Units
Martin McIntosh replied to Futura57's topic in Gadgets and Electronics
You don`t need relays or anything else, that`s what the amps I sent you are for. Just remove the limit switches from the amps and wire in yours. Forget trying to use a servo amp because retract ones are simple on/off switches, not proportional. -
Dead easy. Solder three pieces of brass tube to a small piece of copper clad PCB. Block off the centre one with a blob of solder to park the fuel line on when not in use. Connect one to the tank and the other to the carb and mount this under the model. Simply fill and drain through the clunk connection via a U tube between the two. I use this arrangement whenever possible.
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So called " Driving aids" on new cars , help or hinderence ?
Martin McIntosh replied to Engine Doctor's topic in Chit-chat
Had to get rid of my beloved Audi A6 3.0 TDi Quattro three months or so ago because at 18 years old it developed a warning light which would have been far too expensive to sort out. Had three Volvos in the past, 164 3l straight 6 auto, 2.3 245 Estate and a 2.1l 240 auto saloon. All pretty simple and reliable but the 2.1 would not get better than 20mpg. The V90 estate was the car with the longest load length that I could find and got hold of a very nice example which even has a Tempra spare wheel! With all the so called mod cons and driver aids it is very complex to get my head round the touch screen which is not advisable to play with whilst driving. I found that I could disable the stop/start (for one of the three driving modes) quite easily but it only lasts for one engine start. Operating the Satnav whilst driving is a definite no no and even changing the heater settings on the move is dodgy. Why do they have to make things so difficult now? Volvo should take lessons from Audi regarding driver controls. -
Not familiar with Saitos, but are the carbs twin needle or air bleed? If the latter, then closing the throttle will not impede the fuel flow so unless you use a clamp on the line or arrange it with a U tube which can be parked on a blanked off tube it will probably syphon.
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As has been said above, modern surface mount electronics are to thank for the reliability we have enjoyed for a long tome now. No big electrolytics to vibrate off. I cannot remember when the JR DSX9 came out but I saw one in use at the field, had a quick look and shot off to the local-ish shop to buy one. Still using the original Rx plus very many more; JR, Spektrum and Orange, the only failure being an AR7000 which was stored in a mate`s heated shed an totally died.
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Finding a Controller PCB for these Retract Units
Martin McIntosh replied to Futura57's topic in Gadgets and Electronics
Never locked, blue tooth on and paired to PC, nothing happens. -
Supermarine Spiteful and Seafang
Martin McIntosh replied to Colin Leighfield's topic in Own Design Project Blogs
Old thread still going! I built the one from RCMW years ago, the fus., built as shown was like a brick and that is how the model flew. Kitted it at Old Warden when it went into a spin of death. -
Finding a Controller PCB for these Retract Units
Martin McIntosh replied to Futura57's topic in Gadgets and Electronics
The general construction and servo amp with limit switches looks very similar to HK ones, MCR series. The last couple of sets I bought would not operate on Orange Rxs, probably due to a component change (they need a 5V pulse but the Orange o/p is only 3V). I ordered some spare amps but they were the same. I still have these which measure 27x10 mm. The medium sized plastic retracts use similar, 35x8.5 mm. PM me if you want them. Win 10 and 11 refuse to speak to my camera or phone so I cannot post pics. -
Your most unliked engine , petrol, glowor diesel.
Martin McIntosh replied to Engine Doctor's topic in IC Engines
MDS again. In 1992 I changed career, moved house and gave away most of what I had. I worked in Texas for over a year and on a visit home I heard models flying in a local field. Started collecting stuff. The model press was full of praise for MDS motors so I got a 48, computer gear, a kit etc. The throttle kept jamming fully open because the carb slot had been machined to a letter P shape! Motor ran well but throttling was an issue. I discovered that 10% nitro and a cooler plug fixed everything and clubmates were amazed at the slow idle and fast pickup. I eventually almost gave away the airframe and motor to someone who was struggling but he could not start it. -
Your most unliked engine , petrol, glowor diesel.
Martin McIntosh replied to Engine Doctor's topic in IC Engines
No pangs at all. It was an early Elfin and a bit battered but at least it started OK. I later obtained one of a later mk and it was the most benign diesel I ever owned. -
Your most unliked engine , petrol, glowor diesel.
Martin McIntosh replied to Engine Doctor's topic in IC Engines
Flicking through the replies I see the Bantam cropping up. Got one for Christmas when I was aged 11, along with a c/l Spitfire. Never could get it to start. My mate faired better with a Mills 0.75 powered KK Champ so we taught ourselves to fly using that. I later cobbled together a Cardinal and an experienced modeller saw me struggling to start it and got the thing going. One and only flight saw it end up in a lake where it spent two hours drifting across. Swapped the thing for an Elfin 2.49. Good riddance! -
Correct glass & resin to use please?
Martin McIntosh replied to mightypeesh's topic in All Things Model Flying
The West system is by far the best for laminating or finishing but gets a bit expensive initially if you include the pumps.