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: 540 kv motor v 580kv motor|
Not that simple, the Kv is the unloaded speed of the motor per volt, under load there will be some "slippage" so if the 540kv motor is more efficient it could turn the same size prop at a higher speed.
Unless you've got performance measurements of both motors on the same prop then it's not possible to tell which motor is better.
Plus the FMS might have a different prop than the Freewing which would compensate for the lower kv.
I wouldn't choose one or the other based on the Motor kV, but rather by the models other features.
I had a Glenns Maule and now have a Seagull MaxiLift both with flaps, for steep approaches I drop the flaps to 80 degrees and can then come in on a very steep approach, both models need down elevator with full flap and I have this mixed in. This works up to around 1/3rd throttle after which it zooms up again.
As BEB says it's all about timing, but it is surprising how steep the Maxilift will come in and flare out very easily, the first couple of times I was having to add power to prevent an undershoot.
|Thread: How do I charge a 2S lipo through the balance lead?|
A lot of the simple chargers that come with the small ARTF planes only charge through the balance lead, you could ask your club members if anybody has got one (I've got a least two)
Something like this
Edited By Frank Skilbeck on 14/08/2018 16:50:02
|Thread: STOL mk2|
Something like a Turnigy SK 3530-1000 kv would draw 39amps, 410 watts, on a 3200 mah 3s with a 12 x 6 prop, just over 2kg static thrust according to drivecalc .
|Thread: 35mhz; 40mhz; or 72mhz best for electric model|
The only time I had any glitching on a 35mhz brushless electric model was on an EDF where the aerial ran alongside the motor, but the Rx on this was for small models and didn't have a full length aerial.
I flew quite a few other brushless models on 35mhz (Multiplex Cockpit Sx and MPX IPD receivers) with no issues at all and they all powered the receiver and servos from the ESC BEC. The only reason i don't use 35mhz on any electric models these days is because I like to use telemetry to monitor the flight pack (still using 35mhz in some IC models).
|Thread: Glue advice please.|
I use Blendherm tape on all my film covered gliders and electric models, but for a foam flying wing I'd go with the UHU method.
I have a flying wing which I am informed is a Raven (I can't remember I bought it that long ago), it's hinged with UHU Por, you run a bead on UHU on the wing and the aileron, let it start to set and then bring the surfaces together.
|Thread: EU. LBT|
As I understand it, it would prevent an LBT tx from transmitting on the bits of the band that were gobbled up, but just interfere with a non-LBT tx when it jumped into the affected area.
I couple of years ago I got into discussions on RC Groups with a flier in Singapore who said that they were having a lot of 2.4 interference issues which they thought were caused by high power wifi system and was looking at different systems which might be more immune. So a free for all might end up with a band that we can't all share. I'm no expert on the EU regs but I also read that the US were looking to bring in LBT, bear in mind that it's a shared band so the regs aren't written specifically for RC use.
|Thread: Spit 72" aileron servos|
Here you go, you can use this to calculate the servo torque, it's surprising how little torque is required.
Years ago we would all fit Futaba 148s or 3003s to this type of model, with slightly less torque than these new modern mini servos.
BTW I have used these metal geared servos in my 1/4 and 1/3rd scale gliders and found them to be fine,
|Thread: EU. LBT|
The transmission regulations apply to everything that transmits and that includes receivers which transmit telemetry data back. The are two means of complying with the standard (which was available for at least two years before it became into force), either transmit at low power for a very short duration or check the channel is free and then transmit at a higher power for longer (LBT). Frsky first tried the non-LBT method but it wasn't a success for everybody, so they later brought in the LBT system.
|Thread: SBUS SERVOS|
Chris yes, but it's not just the power concern, it's a single point failure that leads to a loss of all downstream devices, where if you use a multipin connector the loss of a single wire will only affect that servo. I suppose some of this comes from my involvement in safety assessments of instrumentation systems, where we avoid a single connection isolating critical functions. But again in what we do the risk is pretty small and the convenience outweighs this.
I do share you concerns over the Rx battery via switch to the Rx having had problems (fortunately found on the bench), so now on larger models I use FET switches and either dual feeds to the Rx or heavy duty connections.
|Thread: Operating a servo from a transmitter switch|
I'd start by winding down the servo movement to almost nothing and then connecting the doors with them open halfway, you can then adjust the end point travel with switch in the closed and open positions to get the correct shut and open positions, this way you won't stall the servo if the 100% travel setting is too much.
|Thread: SBUS SERVOS|
No, there isn't a standard serial bus protocol and different manufacturers use different protocols. S-Bus is not compatible with Spektrum.
For Spektrum you'd need to look at one of the manufacturers that covers different protocols, e.g. Powerbox.
While I can see the appeal of an SBus system my worry would be that the loss of a single connection would cause all servos that are fed from that hub, and prefer to use multi-pin connectors.
|Thread: Thinking of changing my car|
Not all main dealers are bad and independents good, we had our Mitsubishi Colt serviced by a local dealer for a few years and it developed an oil leak, so we thought it best to get the main dealer to check it out, we booked it in for a main service and to check the oil leak. They found that the vent that circulates the sump gases back to the inlet had not been cleaned and was blocked, cleaning that and the oil leak went away, no extra charge over the service. The independent had missed this. But did have a Ford dealer not refit a sump plug correctly which fell out on the motorway the next day....................................
|Thread: Laser 180 Petrol|
Very nice, any chance of a photo of the rear of the engine, I'm intrigued to see the pump and carb.
I've a friend who runs his Saitos on it, although I think he mixes his own oil in. You can buy it at most good garden machinery suppliers. It is more expensive but it doesn't smell, so your car doesn't stink after you've been flying.
Sounds good, I've just acquired a 2nd hand Laser 150 to replace a DLA32cc which is too noisy for our site, I'm tempted now to wait for the 180 petrol, , hopefully it won't be too long a wait until the production versions are available.
|Thread: Refinishing classic fibreglass fuselages|
Sorry, not for sale, but this is the resprayed fuselage
|Thread: Telemetry - do you use it? What do you think of it?|
Rich, glad it's sorted. Now all you need is a few thermals to check the vario function.
You mentioned height alarm above, not sure if the 16sz can do it, but I've programmed the telemetry on my MPX Profi to cut the motor if I go above a certain height on one electric glider, e.g. throttle cut come on when height exceeds 120m and off when height drops below 40m, so climb to 120m the motor cuts, search for thermals and if none find motor can restart when glider has descended to below 40m
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