Shaun Walsh

would one laptop be an apple device and the other a windows laptop?

Thanks Beth, much appreciated.

I have just downloaded the latest digital RCM&E and, as sometimes happens, one if the pages failed to load properly, it appears as a page of random colours with a 0 in a black box. Is there any way to get the viewer to delete the edition and re-upload it

Sizes are large and so delivery expensive

https://www.aircraftplywoodandtimber.co.uk/birch-plywood.html How about that?

Posted by Broken Prop on 30/04/2019 17:25:50: They will probably want to know if you are LGBT. Edited By Broken Prop on 30/04/2019 17:26:44 50 years ago LGBT was a fancy sandwich.

If I am right in thinking that the size limits for 2 stroke engines is 0.35 cu in, how about a PAW 35 (5.70 cc) TBR-R/C, British, a bit quirky in being a diesel and a classic design. Or would the power output be too low?

Another couple of thoughts Has the Tx throttle been set to give the full 100% output at WOT? Are the ESC settings correct, particularly the motor timing and calibrated to high/low throttle? I usually set timing to "Auto" but it may be necessary to change it to suite the motor. The motor spec appears to be 42A continuous, 50A burst. If you can connect it to a watt meter and check how much current is drawn you may be able to use a 13x7 or 13x8, you might need to change the ESC to a 50A or 60A , that should give you 580W continuous or 700W burst.

Can someone at the club put a wattmeter on the model so you can see just how many amps the motor is pulling and compare that to the battery spec and the limits of the ESC? You might be able to determine the cause of the poor performance. Also which albatross is it, the Dynam one? Edited By Shaun Walsh on 28/04/2019 12:04:25 Edited By Shaun Walsh on 28/04/2019 12:04:45

Posted by Allan Bennett on 28/04/2019 11:44:03: As per the initial replies to you, with the same voltage and higher mAh capacity than originally recommended you should get the same or slightly more power. Providing that the motor is not trying to draw more current than the battery can supply. For example a 3000 mAH battery rated at 15c might not perform particularly well if the motor is trying to draw more than 45 amps at WOT.

What was the exact spec of the battery you were using, particularly the C rating?

Two things: The BMFA already hold a database of members, therefore either: It could be made available to the CAA at little cost meaning that BMFA membership is de-facto registration. Alternatively anyone who wants to fly a drone has to be a member of the BMFA and the CAA don't have to run the system at all. As to who pays, as this is for the protection of passengers, aircraft operators and airports I am sure a small levy per passenger or plane departure would more than pay for the scheme But lets face it, the sort of person who is happy to fly a drone in restricted airspace probably won't realise that they need to register and if they do realise probably won't bother. It's a bit like drink driving, you can reduce the blood alcohol level at which it is legal to drive but it will have no effect because people who drink and drive will do so no matter what the law says, the only way to solve a problem like this is by rigorous enforcement and prosecution but that is far too difficult and therefore expensive, far easier to have a registration system that only affects the law abiding, a bit like gun licencing, how many armed robbers have a firearms licence? Ok, rant over

Depends on the current draw of the motor and the ampere hour rating of the battery. I fly using 3s lipos. My 2200 lipos are rated at 45c continuous which means that in theory they can supply 99 amps without going above their rating. My 3000 lipos are rated at 15c continuous which means they can supply 45 amps continuous, less than half the figure for the 2200s. In practice there is no performance difference between the two because the motor they power draws a maximum of 25 amps, well within the rating both batteries. So multiply the ampere hour rating of the battery by its c rating, If the figure you get is greater than the current actually drawn by the EDF then all is well and the bigger the margin the less strain on the battery.

If you have a nearby hill you could forget the motor and PSS it

Posted by Steve Balaam on 26/02/2019 18:37:51: Hi Guys Many thanks for your responses, much appreciated. I have discounted the EDF option, it would need a 90mm size unit and I would have to cut some large cheater holes to get sufficient air in. The Turnigy motor looks promising, I have considered putting the motor in the nose which may lead to problems getting the CG correct but may be a solution. My thoughts at the moment are to leave the fixed undercarriage off the plane and bungy launch and belly land the plane, if I can source some pusher folding props of the correct diameter perhaps that may be the way to go. Pusher folding props are like hen's teeth, not only do you have to find blades with pusher orientation (or reverse the motor) but you have to stop the blades crossing when stationary which means that they don't open out when the motor restarts and can cause severe vibration. I've been trying to find a suitable folding pusher for a glider power pod project and will have to make my own or used a fixed pusher. Bungey or catapult launching sounds a sensible alternative to an undercarriage

Posted by Denis Watkins on 26/02/2019 18:11:42: It is a pusher Shaun, which can be difficult to source, and drops some power Your motor suggestion would do it BTW It is not impossible, it is just stacking up problems, and with a delta too. Let's see where Steve gets to. Edited By Denis Watkins on 26/02/2019 18:13:47 Use a tractor prop reverse the motor rotation and use threadlock on the prop nut?

Posted by Denis Watkins on 26/02/2019 17:59:15: Posted by Shaun Walsh on 26/02/2019 16:47:01: I'm no expert but how about something like this? **LINK** Running on a 6s should give you around 13k rpm and 150 watts/Lb if my calcs are correct. Agree that 10" a bit small for a model that large but if it worked with a 60 nitro it might be worth a go. Edited By Shaun Walsh on 26/02/2019 16:52:56 That's my problem Shaun No Way would a .60 glow motor survive a 10" prop, and such a waste Even a .46 with a 10" would get you banned from flying 3 or 4 blade 10" prop?

I'm no expert but how about something like this? **LINK** Running on a 6s should give you around 13k rpm and 150 watts/Lb if my calcs are correct. Agree that 10" a bit small for a model that large but if it worked with a 60 nitro it might be worth a go. Edited By Shaun Walsh on 26/02/2019 16:52:56

As long as the C rating multiplied by the ampere hour capacity of the battery comfortably exceeds the current rating of the ESC/motor then you should be OK For example I use Turnigy Graphene batteries, a 3s 2200 65c gives me 5 minutes flying, a 3s 3000 15c gives me 7 minutes pulling a max of around 25 amps. They both end up approximately the same temperature at the end (barely warm) and are both the same size/weight. However if I was to try to fly something requiring more than 45 amps the 2200 battery would be fine, the 3000 probably not so good. Regarding chargers, don't forget to decide whether you want a mains or low voltage charger run off separate mains power supply or car battery or one that will run off either power supply. I use this **LINK** and it has been very good.

Yes we were made of sterner and oilier stuff and spoke loudly so we could be heard above the noise of a 2 stroke 60 with a venturi exhaust 😳

Not sure if this is OTT optimism or a bad case of fat fingers when setting up the advert. https://www.ebay.co.uk/itm/GRAUPNER-RC-PILOT-GLIDER-RADIO-CONTROLLED-IN-KIT-MOUNTING-ART-4216-RARE-KIT/173758956695?hash=item2874d74497:g:~PYAAOSw8cNUTn65:rk:1f:0 I'll have 2 at that price

I thought that might be the case, never mind. Thanks for the quick reply.

I purchased at pocket money prices an Axion Excell 200 micro helicopter which was great to learn on. I also purchased an Axion Polykarpov for indoor/calm outdoor use again for peanuts. The transmitter for both is an Axion AX-4CT which says it uses FHSS technology. Now the question is are all flavours of FHSS the same? Will the Axion transmitter work with other manufacturers' FHSS receivers? Thanks Edited By Shaun Walsh on 17/01/2019 10:12:33

Best heating option for hobby shed? Large single malt, but don't expect what you build to fly straight!

Does the CDI unit have any form of interference suppression built in, could it be failing after a few minutes use and then reverting to normal operation when the engine is turned off? From experience with car CDI units they put out a lot of voltage and produce a fat spark but can also produce a lot of radio interference.