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Everything posted by Martin Harris - Moderator
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Have you activated a flight mode from a long forgotten experiment?
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That’s very often the case after extended storage. Put a (clean) piece of fuel pipe on the inlet nipple, crack the throttle open so there’s a small hole that would allow a 1/16” drill to pass and blow into the tube. The high speed needle should be around 2 1/2 turns open. You should hear a small hissing - if not, you have a blockage (assuming it’s an air bleed carb) which may require the carb stripping and cleaning. If you have a twin needle version, try opening the low end needle until it hisses. This should allow a start when normal tuning should be performed. It may be that old oil deposits will flush through and the low end needle may need readjusting after a little running. If you can get it running but suspect a blockage affecting reliable running or throttling, get it to high revs and with the throttle wide open (and with great care) block the air intake with a finger. The suction will often pull any soft gungy blockage through.
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Perhaps introduce yourself Kevin? We have some problems with attempts to defraud members via small ads so our members are often wary of trading with new posters.
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Question About Differential Ailerons
Martin Harris - Moderator replied to Nigel Heather's topic in All Things Model Flying
In case anyone is misled by John’s jest, adverse yaw is produced by the increase on drag caused by the “downgoing” aileron modifying the wing section, producing more “lift” and in consequence, induced drag. In the case of inverted flight, that increased lift is acting downwards from the aileron increasing the wing’s angle of attack. -
7.2v batteries
Martin Harris - Moderator replied to nbtsm's topic in Model Engineering and Accessories
I think you’ve almost answered your own question - the capacity appears to have dropped. You might consider how you’re charging - with a peak detect charger or trickle? You might be experiencing false peaking on the former - you could try a higher charge rate to improve detection but it’s more likely that if the NiMHs are a few years old, they are past their best. -
SC 25A Exploded Parts Diagram
Martin Harris - Moderator replied to Dennis Mulhair's topic in IC Engines
My ASP 180FS was a bit ill mannered and rough until I added a second head shim, which transformed it. -
Peter Rake’s A.W. FK3 Xtra Easy parts
Martin Harris - Moderator replied to T2shark's topic in FOR SALE
Welcome to the forum T2 Some photos and an idea of the price you’re looking for might help. Perhaps a few words of introduction as many people are wary of buying from unknown sources… -
Free Plan of the Mini Lec Roo
Martin Harris - Moderator replied to Dave Potter's topic in All Things Model Flying
Welcome to the forum Kevin. I don’t think many of the contributors are regular visitors to the forum any more but others may have built or flown this model? -
It’s a good test though. Does your radio have flight modes? You could set a “flight idle” mode and a “landing” mode with reduced idle. Ideally, with most models you should plan for an engine on approach rather than a glide approach - more scale like, with a slower air speed if flown correctly and less chance of a dead stick.
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Laser engines - the state of play following their closure
Martin Harris - Moderator replied to Ron Gray's topic in IC Engines
I’ve removed a couple of posts to tidy the thread and remove references to PMing Jon. Hopefully Jon will respond on the forum, adding to the pool of knowledge for the benefit of Laser owners so I’d rather leave some of them. -
Laser engines - the state of play following their closure
Martin Harris - Moderator replied to Ron Gray's topic in IC Engines
As a general rule, I don’t think we should be advising people to PM Jon. He’s very good at responding to queries on the forum out of the goodness of his heart but has absolutely no connection with Laser or responsibility for support as he is simply an ex-employee. -
Two servo or Y lead for your ailerons ?
Martin Harris - Moderator replied to Rocker's topic in All Things Model Flying
Legal as far as the CAA are concerned but I don’t fancy your chances with the animal welfare lobby! There’s more drift in this thread than a gerbil under a full sized ‘chute in a hurricane. Perhaps it’s time to get back to Y leads? -
Container Robbed.
Martin Harris - Moderator replied to Brian Cooper's topic in Flying Field Reports and Chat
Synthetic DNA marking such as SelectaDNA or Smartwater may act as a deterrent. Applied correctly it is almost impossible to remove all traces. Your local crime prevention team may be able to offer a good deal on one of these kits. -
Some posts edited due to a statement in a post appearing to advocate potential illegal operation. I’m sure this was not intended as Bonzo’s video quite clearly states that FPV flight without a spotter is illegal. My interpretation of a loss of visual control and use of return to home mentioned in the video was that it was several years ago before article 16 mandatory reporting and while recording video rather than FPV flying. I hope this is correct.
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Two servo or Y lead for your ailerons ?
Martin Harris - Moderator replied to Rocker's topic in All Things Model Flying
Large Model Association and Scottish Aeromodellers Association. -
Two servo or Y lead for your ailerons ?
Martin Harris - Moderator replied to Rocker's topic in All Things Model Flying
BMFA, LMA, SAA and FPV-UK members are all exempt from some of the general requirements, including the dropping of articles, under article 16 of the ANO. There may be other organisations that have applied that I'm unaware of. -
Two servo or Y lead for your ailerons ?
Martin Harris - Moderator replied to Rocker's topic in All Things Model Flying
Thanks Dick - my quote was from the wrong source and yours is more authoritative. -
Two servo or Y lead for your ailerons ?
Martin Harris - Moderator replied to Rocker's topic in All Things Model Flying
Perfectly legal unless causing endangerment: Dropping of articles and animals89. —(1) Articles and animals (whether or not attached to a parachute) must not be dropped, or permitted to drop, from an aircraft in flight so as to endanger persons or property. -
Two servo or Y lead for your ailerons ?
Martin Harris - Moderator replied to Rocker's topic in All Things Model Flying
My philosophy is different - I would always use a separate channel unless I had good reason not to. A couple of weeks ago, I modified a model to use as a toffee bomber and stole an aileron channel for the release servo. The temporary Y lead came out the moment I removed the sweetie container… Complex model - I use a bigger receiver but my transmitter supports up to 24 channels so I think I can understand your logic with only 7 available. -
How Far do Flaps Need to go Down?
Martin Harris - Moderator replied to EvilC57's topic in In The Air
I believe this extract was from the report from my acquaintance’s accident: It certainly illustrates the difficulty climbing a fairly heavily loaded and low powered aircraft against the drag of fully deployed flaps - however, a typical model will be likely to have a much better power to weight ratio. -
More correctly, you can’t buy or keep nitromethane or mixtures containing 30% or more by weight without an Explosives Precursors and Poisons licence. Provided you haven’t been a naughty boy in the past, this is just a matter of filling in a form and sending £39.50 to the relevant department.
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12s batteries? Field charging practicalities
Martin Harris - Moderator replied to Edgeflyer's topic in Batteries and Chargers
My MG5 has a 2.4kW inverter built into it so would give me practically unlimited field charging - although we have a solar charged battery solution at our field using surplus commercial UPS batteries (thanks Chris) which supports a busy club operation. -
Four times? I don’t know where you’re located but I can count on one hand the number of our regular Thursday and Saturday sessions on the North Herts/Beds border when we haven’t flown this year. Sometimes it’s been in spite of the weather but our regular attendees have gained a great deal of competence and confidence, flying models that can put up with a bit of rough and tumble. What has changed is the types of model flown. It is quite noticeable that my more valuable (in terms of sentimental attachment as well as monetary considerations) and larger IC models have been out far less frequently.