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spenaroo

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  1. spenaroo
    and this is an example of the different water jackets, here is a ZX14 cylinder and a STX15F which is the PWC version of the engine admittedly the pictures are awful. but you can see the larger porting for the water to run through. my wording wasn't the clearest, I meant thinner walls of the water jackets.
  2. spenaroo
    Yes, coolant has many protective qualities with preventing corrosion and anti-freeze but it also helps with heat, if its not boiling - its not building up pressure for the radiator cap to take effect. distilled water is fine for casual track bikes as they don't sit idle and always have airflow through the radiator to keep the temps under control. you wouldn't want to ride one in traffic though. the proper race bikes will run a non-glycol based coolant, so they get the benefits of the higher boiling point without the drawbacks of slippery messes on the track when it all goes wrong. the endurance riders who do lots of high revs at low speeds will use water-less coolant that doesn't boil to 190*C
  3. spenaroo
    Not saying it cant be done - there are a few one-offs in racecars. but its so much time and effort, and almost done exclusively simply because they wanted to engineer something different. or its a backyarder that had the engine there already.
  4. spenaroo
    okay let me put this another way, Rotax are owned by BRP. BRP also own Evinrude, Johnson and Sea-Doo If it was as simple as modifying the marine engines to an aircraft - wouldn't you think they would have done it so save millions in research. ive seen plenty of motorcycle engines marinised for PWC's. but only the Konig done the other way around. with the exception of a few one-off drag bikes... but they had problems with the cooling system and cooked the motors after a few minutes total run time despite electric pumps and large radiators. the engines are designed for constant flow of cool water, an endless supply from the ocean/lake. they can exchange far more heat through the fluid and run thinner water jackets, as opposed to closed loop systems where the fluid is always at a warm temperature. (which is why we run coolant to increase the boiling point past that of water) closest bet would be a seadoo motor (1600cc, supercharged at 300HP) they run a closed loop system for the engine (using the ride plate submerged in water as a heat exchange) but even they use the surrounding water to cool the inter-cooler and exhaust.
  5. spenaroo
    Cooling will be the bike issue, same problem with adapting an outboard to power a motorcycle. "Outboard motors are cooled by water circulated from the surface they are racing on, which means the coolant temperature is always low and heat can be dissipated quickly. This isn’t the case with liquid cooled land-based engines, which re-circulate the coolant through a radiator. Temperatures are controlled, but the coolant remains relatively (scalding) hot – if the coolant passages and water jackets aren’t designed to deal with this elevated temperature you run into problems... Which is exactly what happened with the König motor. Through trial and error an effective radiator system was developed along with a unique cooling system for the crankcases. Normally liquid cooled engines only need to directly cool the barrels and sometimes the heads. Two-strokes, however, route their fuel charge through the crankcases before being sucked into cylinders. If the crankcases get too hot, the intake charge gets overheated and power suffers. This was a problem with the König, so Kim developed a clever liquid-cooled magnesium sump bolted to the bottom of the engine to keep temperatures in check." https://www.odd-bike.com/2013/04/konig-500-gp-outboard-powered-underdog.html
  6. spenaroo
    oddly enough I want to go in the opposite direction, had a 1999 NB, still my favorite car I've owned and the one I should have never sold. (full exhaust, cold air intake, reinforced fender arms, reinforced chassis rails, reinforced transmission crossover, strut braces, roll bar) I want to get a sprite. because its still an affordable vintage car, and I reckon they just look like fun.
  7. spenaroo
    would you rather fly a spitfire or a cirrus jet? would you rather have an Ferrari 308, or a modern hot hatch? the newer stuff is far more functional and performs better.... but it doesn't have the same emotional appeal
  8. spenaroo
    yeah, I learnt it from a chat with my brother. He wanted to buy a motorcycle, I had a couple spare at the time that I offered him full use of (just pay rego) his response is that while he knew it was reliable and higher performance... it just didn't have the look he wanted when he saw his reflection in the window. And he is completely right, at the end of the day we do this stuff because of how it makes us feel. if we were chasing numbers we'd jump on a commercial flight instead.
  9. spenaroo
    can we all just agree that they win in the all important wank factor. lets face it, at the end of the day being able to look back at the aircraft and have bragging rights important. we are all a little vein. and there is the old adage, if it looks good - it'll perform good
  10. spenaroo
  11. spenaroo
    military aircraft, they aren't worried about passenger comfort was just listening to a podcast on the c17, it can pull 2.5G.
  12. spenaroo
    Yeah been an issue with bikes for years, used to be telling people to drain the tank of Shell and re-fuel with BP. (where/when they filled up last was literally the first question we would ask for rough running or starting issues, and 90% of the time it was Shell fuel) now its use 95 and not 98. Which makes sense when you realize its actually marketed around additives and detergents, not performance or quality. from the BP website "BP has perfected our innovative formulation – based on patented technology – to produce BP Ultimate Unleaded 98, our best ever dirt-busting petrol. In fact, BP Ultimate Unleaded 98 busts dirt in just 2 tanks!" can also see the effects when fuel goes off, it used to leave behind a varnish residue. now it turns into a jelly like substance.
  13. spenaroo
    wasn't even a sandbag. just a piece of tin, worse then I remember it https://www.airshow.com.au/airshow2021/images/gallery/2019/2019-03-03-13.jpg
  14. spenaroo
    As a guy in his 20's I thought it was out of place and poorly done. life in a trench isn't standing next to a single sandbag wall. and there was nothing really on display - just some guys in dress-up from memory there was an unnecessary background soundtrack playing too, of trench noises? the whole group I was with took one look and went elsewhere. including a 90 year old veteran (who was like an excited toddler around the military aircraft, unsuccessfully trying to talk all the personnel into letting him have a sit in the static displays)
  15. spenaroo
    hope the rest of it is lighter too... "In an August 2019 video the prototype was weighed at an empty weight of 3,144 lb (1,426 kg), which is 1,344 lb (610 kg) heavier than originally estimated. At a gross weight of 3,800 lb (1,724 kg) the aircraft's useful load is 656 lb (298 kg). With full fuel of 121 U.S. gallons (460 L; 101 imp gal) the payload is −70 lb (−32 kg)" reminds me of doing a Nav challenge (team of 3, plus the instructor. would jump in another aircraft when it wasn't your leg to fly) in the Jabiru and figuring out the order of pilots based on our weight, with the lightest first to give the maximum fuel load. even then a full fuel load would still allow for a single pilot. was referring more to the engineering side. with everything being calculated and simulated beforehand.
  16. spenaroo
    everything in the universe is balanced... this must be the universes check for Mike Patey
  17. spenaroo
    yeah, imagine it would be easy to play imaginary fighter pilot
  18. spenaroo
    damn, that's cool
  19. spenaroo
    having gone from jabiru's to Vixxens, the manual flap is awesome. just reach up and pull down. no need to have loose straps so I can reach the panel to activate flaps. also an instant fluid movement, no waiting for the action to happen holding your hand on the switch.
  20. spenaroo
    In interviews I thought he said that the battery had been replaced before the flight
  21. spenaroo
    I want to see what his brother Mark is doing on his cub build, Mike was all about power and the ability to do trips at high altitude take-offs. Mark is all about weight and take-off performance for a competition STOL aircraft
  22. spenaroo
    You never pull the head off of them because of the expense. After 300k something fails and it's easier to just drop another motor in. Seen it a few times. Water pump fails - new motor. Timing belt failure - new motor. They just aren't economical to rebuild.
  23. spenaroo
    Yeah but the weight is also increasing along with the complexity. Those 2lt utes aren't simple single turbo, it's all bi turbo now. But they have limitations especially with the emissions crap Needing to DPF burn. They also have shorter engine life's.
  24. spenaroo
    that's the reality unfortunately, engines are getting more efficient but less powerful thanks to emissions, the new generations of bikes have the same power or sometimes less then the previous for the same capacity. and its all down to tighter regulations on emissions. cant burn oil anymore to help with the performance
  25. spenaroo
    here you go https://drive.google.com/file/d/1isMc9mZis7tlcLf1SAgFFqU_skBiLB5C/view?usp=sharing
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