Frank Skilbeck
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Posts posted by Frank Skilbeck
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10 hours ago, Jim Hearnden 1 said:
So morale is & I now this is remember the JR is negative centre pole the opposite of every other user of these jacks.
And Spektrum, bit surprised your charger didn't alarm reversed polarity.
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As Philip notes, but an IC engines efficiency varies with load and rpm, at high load at peak torque it produces the most power per unit of fuel, away from that it uses more fuel per unit of power, so although if it takes 4x the power to go 2x as fast it won't take 4x as much fuel as the engine is more efficient at higher loads, you might even be able to find the brake specific fuel consumption for your engine, but this fuel map is one of the reasons more and more gears have been added to autos to keep the engine running as close to this sweet spot as possible.
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Almost a canard eh 😉
But I had similar with a Fokker D8, changing from a 4s to a 3s battery, same prop, made the model more pleasant to fly.
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45 minutes ago, Martin Harris - Moderator said:
One factor I've never seen discussed is that of the effect of converting natural energy into heat. For example, we're converting moving air masses (we call it wind) into electrical energy which might have an effect on weather patterns (maybe a bit of a "butterfly effect"), photo energy being trapped and converted to electricity rather than reflecting into space, tidal flow being modified and I expect many more examples. The majority of this "clean" energy ends up being converted to heat - and I suspect will contribute to global warming.
This (and any) planet has a finite life so we're only delaying the inevitable but I fear that war and famine will perform a partial reset unless we can halt (and reverse) the imbalances from unsustainable population pressure. I suspect that whether we're powering our cars with (direct) fossil fuels or electricity will be the least of our concerns...
Actually the Earth radiates heat, without greenhouse gases we would be at a toasty -16 degC, as most of the heat from the Sun is radiated back into space, but this infra red radiation excites some molecules, namely H20, methane and CO2, which in turn heat the surrounding air.
And just about all carbon based fuels end up being turned into heat, a typical IC engine turns over 70% of the stored energy in the fuel into heat, well it actually turns 100% of it to heat but then turns less than 30% into motion.
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35 minutes ago, Erfolg said:
As for concrete usage, yep, it seems that the oil industry has used some, although it would or will be interesting to know a comparative world wide snap shot of how much goes into all the platforms and anchors, compared to wind turbines (a few hundred are being built off-sure here on the Fylde). Although comparing energy delivered to some unit of concrete is required.
The giant deepwater concrete platforms are a bit of a North Sea speciality, mainly due to the deep water fjords in Norway where they could be built and connected.to the topsides. The did manage to.sink one in the fjord when.the ballasting system failed, it registered around 6 on the richter scale when.it hit the.bottom if I recall. But onshore facilities usually have fairly substansial concrete foundations too and as noted every well world.wide will have its various strings of casing cemented in place. A cost per unit energy produced would be interesting as well as total CO2 released per unit of energy produced too, including the construction, extraction, conversion and delivery to the end user. There's an interesting article studying the increasing amount of energy required to produce oil, https://jpt.spe.org/plummeting-energy-return-on-investment-of-oil-and-the-impact-on-global-energy-landscape ,
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The main problem with something like the P68 is that it won't be very resiliant to the "occassional" heavy arrival that may occur when you're first learning to land. The only twin I've ever used as a trainer is the venerable Multiplex Twin Star and they are pretty good in that roll.
but I'd recommend you pop along to your local club before you purchase anything, they may even have a club trainer you can have a go on.
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24 minutes ago, John Rickett 102 said:
63,000 cubic meters used in Heidrun, Frank. Much of it poured using wheel barrows!
Not by you 😉That's a floater too, the fixed gravity based ones were typically 200,000 tons of concrete, I think they had more than one wheelbarrow!
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On 10/02/2024 at 14:25, Erfolg said:
There have been other reports in the press that are not encouraging with respect to EVs, one being that specific tyres for EVs (is it all) have shallower tread, also wear out faster, due to the combination of heavier vehicles, high initial acceleration, combined with the shallow depth of tread.
One of the issues that probably many have no awareness off is that the underground transmission cables, are often oil or gassed cooled, these cables are armoured (wire) and designed to withstand the forces generated from transmission, they invariably will have significant magnetic fields (as do the overhead cables). There is or was often a lead sheave to help with the mechanical performance. Sub sea cables are similar. As is usual, heat generation is an energy loss.
I shudder at the energy and Co2 released from Cement product. The bases of wind turbines need a
You do realise that every gas/oil well is cemented in place, it was a faulty cement job that was the instigator of the Gulf of Mexico Deep Water Horizon "spill".
I wonder how much concrete is in one of these
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Years ago when my son was learning to fly, he would get a bit despondent when his landing attempt damaged the IC trainer we had curtailing flying for the day. Bought a Wildthing and went off the local slope, once he realised it was very difficult to damage he gained confidence really quickly. I've still got the Wildthing some 20 years later, and let relative newbies fly it.
The great thing about slope soaring is that it does teach you that elevator controls speed.
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Last of the winter punch
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Here's my trolley, you can even tow your model with it.
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27 minutes ago, Rich Griff said:
I take it you guys carry everything from the back of your car to the pits area ?
Sometimes the pits area are some distance from the car, or even home...
Think old oap shopping trolley with half gallon fuel resevoir, hand pump, 12v 12 ah motorcycle battery ( the same one as the bikes ) to power electric starter, power panel to regulate 12v down to glow clip, clothes peg type, room for all of this topped off by box for tools and tx. .
One hand free for model, the other used to pull trolley along. Trolley fits in the back of the car.
Or
Get a slave/assistant to carry all the stuff.
I used a foldable festival trolley I got from Aldi, had it for 3 years, been brilliant. (My flight box is around 45 years old!)
4s Life powered starter
Hand pump
Standard glow stick
Make sure you include a fuel filter in the pump discharge to filter the fuel as you fill the plane.
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Remember there's two types of RC heli's, those that have crashed and those that haven't crashed yet😗
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Just resurrecting an old plan built Stearman for an old Laser 150, I'll test fly it and if any good might look at adding a dummy radial.
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6 minutes ago, Arthur Harris said:
Which reinforces my view that paper magazines posted to members are a waste of money- and some of it is mine. Almost everyone has a smart phone these days, or at least access to the internet through a different device. Most organisations switched to paperless years ago, to save money and save paper.
You've obviously not been reading the thread on smart phones 😉
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16 minutes ago, steve too said:
I do flick through the BMFA News before binning it. The adverts are the best bits.
Probably similar to a lot, I do read it, but then again I'm usually the one explaining what our CAA restrictions/exemptions are so need to keep upto speed. I often say it was explained in the BMFA news, but then am advised that they never bothered to read it.
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15 hours ago, toto said:
I renewed my BMFA and LMA ....... what's the script with the CAA ?
How often is that renewed ..... annually ?
Toto
Yes, but it runs from the date of issue, whereas BMFA and LMA are calendar year, so if you got your operator ID in April it only needs renewing in April and you get a notification from the CAA a couple of weeks before. If you got your operator ID via the BMFA/LMA you can check the CAA expiry on your membership online details.
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Not sure if the skill in restoring Teddy Bears is transferable to washing machines.
I've done the element in our cooker a couple of times and done the hinges on the oven and fridge. My speciality though is bringing old RC models back into service 😁
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I've used a few different brands, most have been fine, I like the ZTW Beatles ESCs, work well and have been very reliable and reasonable cost. Several UK based suppliers too, eg Robotbirds, RC World.
But I also have a couple of Overlander ESCs and they've been fine too.
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Neat, where did you get the Li-ion batteries from please.
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Robin, thanks for that. Only one venturi insert (fitted) with the one I have.
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11 minutes ago, Jake Bullit said:
Why do you need to pull the oven out. Our grill and main elements can both be done in situ.
Yep, did the element in our fan oven just before Xmas, found a youtube video and just followed that.
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Few more pics, looking through the exhaust port the piston definitely has a wedge shaped deflector, also the glow plug is offset too. It's definitely a 3, it's cast in.
Powering the Rx
in Beginners
Posted
Note all modern receivers are fine on 4/5 cell nimhs or 2s lipo/life batteries, but unless the servos are HV you can't use a 2s lipo to power the servos without an BEC to drop the voltage. Some older servos, e.g JR 517s are only suitable for 4 cell nimhs.
I typically use 4/5 cell nimhs or 2s life batteries in my IC models. Note we used to go flying all day on a 4 channel sports model with a 600 mah 4 cell NiCd.