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rossfi

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About rossfi

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    Copper Member

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  • Gender
    Male
  • Location
    Sydney Area, Australia
  • Interests
    Aeroplanes/Flying, Electronics, Computing, Bushcraft, Technology etc etc etc
  1. Hi Dave, I have to say - Mate !!! - That is a work of Art !! You're really moving forward now! I'm sending that last photo down to my mechanic mate in Melbourne . . . I'm sure he'll be just as impressed . . .
  2. Hi Homefire, Yes you're right about that - the number and variety of systems out there has gone crazy indeed - makes it very hard to pick the 'winners' . . For my part I still like the Arduino platform it's just so intuitive and quick to test ideas on or knock out a quick solution. Thing is that when the job gets complex you still have to knuckle down and do the hard yards - in detail . . sigh (I want to build an electronic ignition control - but even a basic one is fairly complex coding). Good thing is that there are plenty of others leading the way developing & sharing code that can be leveraged & as I mentioned there is a bit of crossover between Arduino & Micromite which could create potential opportunities. You're lucky to know a Serb programmer mate - those guys are generally Superb at coding! One of my mates gave me a 'broken' Rasberry board a while back - turned out it just needed the Operating System to be reloaded. Worked fine after that so I gave it back to him. I did find that the video was a bit slowww however . . . No surprise really, hard to fit a video accelerator and extra memory on such a tiny board. After some thought I realised it wouldn't do well on aircraft electronics though (EFIS, Engine Management/Ignition) as the versions of Linux used are not (as far as I know) Real-Time-Operating-Systems (RTOS). Have fun with all the links - it is a fascinating subject . . Now if I could just find a CHEAP high-brightness Colour display . . . . .
  3. Hi Dave, Sorry to hear you've been unwell but good to hear that you seem to be on the mend - and you've got summer coming! 1st up thanks for the answer on the motor - the weight part makes sense and my mechanic mate who I mentioned earlier had a quick look on the internet and picked up on it real fast then explained it to me - He seems to have taken an interest and says he wants to build one - the engine that is - just cause he likes the 'sound' of it - (he has no interest in flying and thinks I'm ). At any rate I may have a helper if I decide to move forward on this. 2nd - No probs on the spotting - glad to help. The diagonal bracing thing is interesting. I noticed that Leonard has used triangles extensively which seems to be standard practice but I've also noticed he hasn't used it on the wing struts going back down to the fuselage (as in the Kitfox, Carbon cub etc) - it could be a 'distribution of forces' thing - more thought/research required. Thanks for the 'hint' on the Oz builders and the Eaglers Nest - I did have both on my 'look into' list but your prompt got me looking and I must say Grant's machine is Very nice indeed. I've also found out as a result that the Legal Eagles are an 'approved design' here which cuts down on the paperwork some - if you build exactly per the spec - but of course my reason for wanting to build it is that it's such a good basic platform and I can see so many opportunities to test ideas (meaning design changes so more paperwork . . sigh ). Speaking of design changes I've noticed to that you've made the tail feathers out of wood - which is another change you've made that I like and seems 'right' - is that aesthetics? a weight thing? does W&B become an issue? For my part I was thinking of flipping the back end of the fuselage 180_degrees so that the flat part of the triangle is at the top giving me a bit of a flat surface to work with at the back to mount the tail-feathers and hopefully removing the need for wire bracing?
  4. Hmmm not sure why that pic came up twice?
  5. LOL - Not too fussed about the "Aesthetics and Machismo" to start with but not real keen on the bumpy ride idea either. As it happens I just had the same conversation with a mate in Melbourne who tells me it would be cheap enough (??) to get a new crank made up from scratch. Advantage is that if I want to restore to 4 cyl (by way of a power upgrade) I can by replacing original crank and opposite head assembly. VW engines are available here but not as much as in your neck of the woods, so tend to be expensive. OK Homefire - I'm not sure of how much you already know so I hope the following info doesn't come out sounding like a 'lecture from on high' - if it does please excuse me in advance, I'm doing/writing lots of assignments, presentations and lesson plans atm . . . I noticed that at the moment you are using the Mega 2650 as the 'brains' for the basic EFIS/EMS functions and I wondered if it will have sufficient capability for what you want to do? Or at least for for the additions you are likely to want make over time. While the 2650 has lots of IO and is 'cheap as', there has been a lot of development since that board came out and there are a lot of alternatives (likely with cheap Chinese clones) that may have more available processing power to handle the workloads (hate those 1201 errors ). As you'd know the Arduino platform (& the IDE) was originally designed around the 8 bit AVR processor platforms (including Uno & Mega2650). Since then the IDE has now been expanded considerably (& sometimes copied outright) to include a much wider range of processor/platforms, many of them 32 bit with gobs of memory & I/O as well as massive speed increases. One example of these is the 32 bit PIC processor made by Microchip, a US company with a very long pedigree (and which has just bought out AVR). An example of two boards made by Digilent https://store.digilentinc.com/processors/processor-boards/ is shown below (both based on the PIC32). I have the bigger of the two which as you can see is very similar to the full-size Mega (with even more I/O) and which is why I really sat up and paid attention when you posted the mini EFIS info. Sadly I've not seen a clone of it similar to the 'Mini-Mega'. There are other boards and of course there is the Arduino Due itself, but it is a bit of a moving target and its hard to know which will last the distance (see the Maple project https://www.leaflabs.com/maple - have just found out they are now 'discontinued' but heaps of Chinese clones out there based on the same STM32 chip, now likely to be orphaned). The "Teensy" boards https://www.pjrc.com/teensy/ can also be programmed by the Arduino IDE and they have been around for a long time with pjrc contributing to the Arduino knowledge base. The beauty of the new Arduino IDE is that you should now be able to change the underlying platform with relative ease, though there will always be glitches and some work to fix it There is also another platform altogether called the 'Micromite' http://geoffg.net/micromite.html which started some years ago as a series of publications in a local electronics magazine by a guy call Geoff Graham (from West Oz) which is also based on the PIC 32 platform but which uses a clone of GW Basic for programming (it also allows inline 'C' programming). There has been steady development over a number of years much of it previewed on a forum called "The Back Shed" https://www.thebackshed.com/forum/forum_topics.asp?FID=16. One of the people who has made some significant contributions is a guy called Peter Mather from the UK who seems to be a genius at 'C' programming and PCB design (I think he is planning on building a plane too). Peter wrote some inline C code for an EFIS on the Micromite and you can see the working device here https://www.youtube.com/watch?v=SQ_h7oSppGk. Brightness is still an issue but with OLEDs around the corner . . . . so one to watch . . . (some of the latest conversations are around PIC chips with clocks running in the 200MHz range). There is a mob over your way that sells a couple of Peters PCB designs that have built in LCD controller interfaces as well as Arduino hardware footprints for very reasonable prices http://www.circuitgizmos.com/Micromite-Devices-c14171441. I bought a couple to 'play' with but sadly am just too busy atm There is a fair amount of crossover between these two platforms now and it's relatively easy to change the boot code on a Microchip PIC32 for either platform. I don't know if any of the above will help you and Dave but it should keep you browsing for a while and may yet help at some point in the future or give you some ideas. At any rate I hope you find some food for thought . . . Well this has been a nice diversion But it's back to the grindstone for mee . . sigh
  6. Hi Dave, Been going through this blog since I found it and thought I'd ask a question if you don't mind (& given your mechanical skills) - and the question is this; Why does everyone cut the VW engine to make a boxer twin? i.e. Why not just remove the cylinder heads from one side, block up the holes, re-balance & fire it up as an inline twin? . . Something to do with the angle of the dangle on the crankshaft? Also I noticed you've widened the top of the air-frame where the wings attach (which looks Much betterer :-) but haven't added any diagonal bracing to the rectangle/squares formed in the mod. I know there are a few designs that don't but have also noticed a lot of designs that Do - And given that your wings attach there, there may be some twisting forces (yaw) from potential wind gusts to account for??? It may seem odd that I can't get my head around the first question yet can still make the second observation but the firing order in my head is a bit orf from months of study on other topics. BTW I'm not a mechanical engineer, just an old phart with a lifelong interest in aircraft - I'm more of an electronics/IT/computing bod . . . Would love to build one of these if I can set aside the time & money but am rather less sure of my building skills & Oz is chock full of regulations compared to the US. At any rate thanks for posting this series - I've learned a lot from reading through it and I wish you all the best with getting it done . . . Oh and P.S. - I may have some ideas for Homefire around the Arduino stuff if he is interested?? Kind Regds Ross Sydney/Oz
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