Here is a list of all the postings Frank Skilbeck has made in our forums. Click on a thread name to jump to the thread.
|Thread: Found somewhere to fly!|
And most of all, enjoy the time with your two kids, they'll be grown up in no time.
|Thread: Multiplex Vario/Altimeter vs UniSens-E|
Yep, used both, and the SM Modelbau GPS logger, aerobtec Altis GPS unit, and home made Arduino vario,
The MPX and Unisens are both very easy to use (on M-Link), the MPX vario comes configured for M Link operation so is just plug and play but is easily changed on the MPX launcher program (using the MPX USB adapter). The Unisens you would have to hook up a PC, either with their com cable or a MPX USB adapter, to set to M-Link and adjust the settings, very easy to do, but the software is all in German so you'll need to download the English manual and work your way through it.
I use the Unisens E in my electric gliders so I not only have vario but can monitor the flight battery too and the MPX vario in pure gliders. My mate has a Cockpit Sx 9 and uses some of my homemade arduino varios in his gliders.
|Thread: Futaba 9CAP.|
Probably a faulty tx pot on that stick (aileron?), I know the guys in our club who used to have old 9 CAPs changed out the pots periodically.
|Thread: Can you charge a LiPo through its balance lead?|
I have an e-flite charger that charges 3s and 4s batteries through the balance lead at upto 3 amps. (it's the one that came with the original Habu EDF I think).
|Thread: Latest Lemon DSMP/X 7 check Plus Stabiliser|
I assume when you say ballooning you mean that the model raises it's nose.
If you have a mix on the elevator and you are in heading hold/self leveling mode the gyro will see that as an instruction to rotate the plane around that axis and move the control accordingly, so best not to have a Tx mix active in those gyro modes.
|Thread: Finding Models|
Maize field this time, drone pilot crashed, we spent a couple of hours looking with no joy, we went as far to tell the farmer there was a drone in the field with a lipo attached (he wasn't concerned), then a week later a fixed wing deadsticked into the same field, walking to get that he stumbled across the drone.
Also what we've had to do when modellers go to find a model is get them to take a flag on a stick, and we can then communicate via mobile where they are and direct them to the model.
|Thread: Electric Cars.|
Shame really, if you commuted 140 miles per day for 200 days per annum thats 28000 miles, approx 2500 litres of diesel (51 mpg) at £1.30 is £3250, an electric car doing 4 miles per kwh would be 700 kwh per annum at the average UK peak rate of 14.37p/kwh is £1005 pa and off peak of 8.7p £610 pa. Not taking into account the reduced servicing costs. Plus if you charged at home you wouldn't be visiting a garage every 4 days or so.
But a better option would be to work nearer home................................
|Thread: Old Fuel|
They are full unused/unopened containers stored in a shed/garage, I'll give them a go and report back.
I have been given a couple of gallons of Southern Modelcraft 0% nitro synthetic fuel which is approx 10 years old, while it is in unopened sealed containers it appears slightly darker than the fuel I bought last year. Is it worth giving it a try?
|Thread: Electric Cars.|
Yes, but a bigger impact is the reduced performance of the batteries at cold temperatures which is an even bigger impact on range. Some manufacturers have battery heating systems to combat this but this too uses power.
On the flip side a lot of electric cars allow you to preheat therm, so you could do this while they are still hooked up to the charger, so you wouldn't need to start the engine and then walk round scraping the windows and the car would be nice and toasty when you get into it.
Agreed, using gas for heating is quite efficient, but using gas or liquid fossil fuel to provide mechanical energy isn't and thats what I was referring too.
As regards power generation a combine cycle gas turbine which uses the exhaust gas to produce steam to drive a steam turbine give an overall thermal efficiency of over 60%.
Trevors maths were not 10:1 but 5:1, but one of the advantages of electric cars is that they recover kenetic energy when they slow down and don't use fuel when they are stopped in traffic, plus an IC engine is only at it's best efficiency when it's running at a specific point, so real world efficiency is much less.
I'm not trying to be selective I understand the limitations of electric cars and drive a diesel myself, but have to admit that in terms of overall pollution per mile driven then an electric car produces less pollution. Note the average CO2 emissions per kwh in 2018 were 270 g/kwh ( last 24 hrs 212 g/kwh), a Nissan Leaf will do 200-240 miles, say 320 km on 60kwh, so that equates to 51g/km. Not great and the UK has one of the lowest power generation CO2 emissions of all developed countries (down from over 500g/kwh a few years ago), mainly due to the switch from coal to combined cycle gas.
Edited By Frank Skilbeck on 28/07/2019 17:09:29
Ereflog, boiling a kettle is a poor analogy as the thermal efficiency of this is typically 80% plus, now when you convert that energy to mechanical efficiency then that is not very efficient because you can't recover most of the energy, which is just expelled as heat.
Also combined cycle gas power generation is a gas turbime running at circa 30% efficinency and using the exhaust gas to generate steam to run steam turbines, to being up the overall efficiency. This is now most of the fossil fuel power generation in the UK.
Yes, but I didn't take account of the losses in the supply of petrol/diesel either.
An interesting concept is EORI which the a measure of the energy ratio to extract fuels, which is going down as oil extraction is become more difficult as the easy to access reserves have been exploited, renewables are becoming competitive on this basis, **LINK**
Edited By Frank Skilbeck on 27/07/2019 22:54:52
Yep a 60 litres of diesel has around 640 kwh or energy compared to the 60 kwh battery in a new Nissan Leaf+ that is only good for upto 240 miles.
|Thread: Building in washout...|
It's easier to put the twist in along the complete wing, it also means that the airflow over the wing stalls from the center outwards.
Note the purpose of washout isn't to delay the stall, but to encourage the airflow breakaway in the center first so the wing tips keep flying. That way the plane will either drop it's nose or mush along nose high losing height, but it will avoid suddenly dropping a wing. Note the wing will stall when the angle of attack is too high, I once had a plane that had a vicious stall coming out of the bottom of a loop if you pulled too hard on the elevator, but was reasonably easy to land.
|Thread: Electric Cars.|
Can you back that up, the best fossil fueled power plants, gas fired combined cycle plants, have a thermal efficiency of over 60%, and an electric car is over 85% efficient, so that's an overall efficiency of 50% or so. And the engine thermal efficiency you quote is an engine running at optimum conditions, say cruising at 55 mph maybe, plus that doesn't include the losses in extraction, transportation, refining and then distribution of liquid hydrocarbon fuels.
|Thread: Building in washout...|
No No, the tips should have a little less incidence than the wing root, that way the wing stalls in the center first, "stalling" the dreaded wing drop.
You don't need much 1 to 2 degrees is fine. Normally when you are building a wing you'd fit the leading edge sheeting with the wing supported by wing rib jibs which are set to give the correct washout. But if you don't then just calculate the amount the trailing edge at the tip has to be raised and and pack it up a bit when building. If it is built already you can build the twist in when covering, but just make sure both wings are the same.
The other thing that is worth doing is making sure that you have some aileron differential, typically start with the up aileron movement being 2x the down.
|Thread: Phase 6 or middle phase electric conversion|
Having built a Phase 6 many years ago, fitting an electric motor wouldn't be easy as the nose section is quite thin.
If I was doing it then I'd build two fuselages, one as per design for slope soaring and 2nd modified to be wider to take a decent sized electric motor and chosen battery.
|Thread: Differential thrust mix.|
Very useful on twin engined water planes though.
One other option would be to add a V tail mixer and feed that from throttle and a spare channel, you could then mix rudder into the spare channel so you can set the differential throttle mix (you don't want a lot of differential throttle).
Used to be quite common before telemetry, look up Picolario. There's one for sale on scalesoaring.co.uk at the moment.
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