Jump to content

Moneybox

Members
 View Profile  See their activity

  • Posts

    781

  • Joined

  • Last visited

  • Days Won

    26

 Content Type 

Everything posted by Moneybox

  1. Moneybox
    An interesting scenario, the possibility of running on all four with a broken throttle cable however I think that would be an unlikely failure on a regularly serviced engine. I think you'd need to do a lot of testing before you went to the expense of making casting patterns. I've built plenty but molds but to cast a manifold is expensive. You first have to form the sand core in a mold. Then the core is fitted into the mold and the molten metal fills the cavity in between. Complex and expensive so you need to sell plenty to cover developments costs.
  2. Moneybox
    I don't have me plane here so I can't check but that thread into the manifold looks to be about 3/8"BSP so with the correct elbow threaded in a larger diameter crossover would be a simple conversion with no modification to the manifold.
  3. Moneybox
    Looks like a serious overkill. From 8mm to 1"? If there's an advantage in doing that it might be better value to just retap the existing hole on the manifold and go a little larger. Going from 8mm diameter to 15mm is more than triple the size.
  4. Moneybox
    Does anybody get the feeling we may have veered off from the theme of this thread? Some/many of the comments are getting a little to personal in my opinion. Perhaps it's time to call it quits and agree to disagree,
  5. Moneybox
    Are you saying crossing the plug wires to clear the carby jets is not a good idea? 😁
  6. Moneybox
    So nothing new there. I watched the interview in the previous video and the outcome is that any details that relate to design and chemistry remain a secret. The interesting part is that they are making outlandish claims regarding the battery charge time, lifespan and capacity. There are a lot of skeptics claiming that it must be a super capacitor however a super capacitor cannot meet their claimed capacity of 400 WH/Kg. I like to think their claims are real and we have a new revolutionary designed battery that'll make electrical energy more safe and affordable. The Australian government are meant to be investing heavily into battery manufacture but we're yet to see that come to fruition as well.
  7. Moneybox
    and it's not even April yet...
  8. Moneybox
    No doubt we're polar opposites. I'm a little casual however I operate on prior knowledge. I didn't spend a lifetime in mechanical engineering without picking up a few clues along the way. As I said before heading to Melbourne "If it starts and runs without overheating it'll make it across the Nullarbor". That doesn't mean I don't take care, I just know what I'm doing in most situations. If the vehicle was to hiccup along the way I have what it takes to sort it out so I take on things that some may find risky, for me it's a calculated risk. I'm yet to learn aviation and I'm quite aware that I'm in the high risk category where the casual approach can bring somebody to an untimely end however I've passed the last 72 years without a vehicle accident (non-competition) or serious injury so I think I have a fair chance of getting it sorted.
  9. Moneybox
    Nev I think most would understand that cool air is more dense therefore you can squeeze more into a confined space but we're talking about carburettor icing, something that Rotax seem to have less of a problem with than other engines in similar service. It has nothing to do with the fact that you brought it up even if you did appear a little rude in the manner you did so. What I'm suggesting is that Rotax may be utilising available heat to help prevent carburettor icing. If heat transfer from the airbox is the answer you'd get less heat at higher revs due to the more rapid airflow. Therefore performance at higher engine speed would be less affected. Once you reduce throttle and therefore airflow through the airbox incoming air temperature would rise effectively combatting carburettor icing.
  10. Moneybox
    Nev, it's not new. If you look back a few years at automotive engines running carburettors, later versions used water heated manifolds due to the problem created by evaporation of the fuel causing cooling.
  11. Moneybox
    You can bet these components are made to a predetermined Rotax specification or at least approved by Rotax.
  12. Moneybox
    The photo above is a snip from the Rotax website so it appears to be an original Rotax component.
  13. Moneybox
    I think you're missing the point Nev. Having the air pass through a large aluminium chamber in a hot engine bay will be introducing heated air. If Rotax wanted to prevent this they could have easily reduced the surface area of the box or it could be insulated from the accumulated heat in the top rear of the engine bay. Perhaps they intend to raise the temperature of the incoming air to prevent carburettor icing particularly at lower engine revs where the air spends more time in that chamber.
  14. Moneybox
    Perhaps Rotax did their homework on this one and thus prevented a known problem with carburettor icing by the induction of preheated air. 😉
  15. Moneybox
    I guess we'll just have to wait and see. I'm hoping they have what they claim to have because it'll not only improve safety but should significantly reduce battery cost once there's local manufacture and competition. This thread is about the Knob engine. Is the Donut engine a genuine product or just media hype as well?
  16. Moneybox
    My brother and Sister-in-law own the Cape Palmerston Holiday Village. I guess they'll be getting a good damping down at the moment. The difference between there and here is like chalk and cheese. You'll get a few inches in a good downpour. Here it can bucket down for an hour or so and we might see 10mm in the rain gauge.
  17. Moneybox
    I can't think of a better one. If you are going to draw air through an aluminium box mounted high in the rear of the hot engine bay then you are going to be feeding preheated air into the carburettors. I don't don't have the data to back that up but Skippy has stated previously his engine bay temperatures. The upper rear unventilated area is most likely as hot an area as you can find. Heat transfer is inevitable.
  18. Moneybox
    Perhaps that big aluminium airbox absorbs enough engine bay heat to do the job?
  19. Moneybox
    I can't see a reason for that comment. Of course it's the sceptics' job to knock every new innovation but if they are ready to market a motorcycle powered by a Donut motor and a Donut battery then there could be more to it than media hype. I can understand their need to keep the technology secret as long as possible because anybody and everybody wants a piece of the action if it's as successful as quoted. I would like to see the end to Lithium batteries due to their destructive properties that we're seeing demonstrated every day. It's only a matter of time before a passenger packed airliner crashes to earth after one faulty Lithium battery carried in hand luggage or cargo sets off a chain of events that cannot be controlled. Of course it may have already happened, we don't always get the whole story when a plane comes down.
  20. Moneybox
    A very interesting prototype but perhaps a little late to the market. Time will tell but with innovation like the Donut engine (as posted by Kyle Communications) combined with the Donut solid state battery it seems electric power is likely to soon become efficient enough to be the norm in many vehicles including aircraft.
  21. Moneybox
    In my RAAus training in the Harmony with a Rotax 912 we only ever tested carby heat operation at run-up. Carby heat was never used in flight.
  22. Moneybox
    I've found it better to buy the multi layered heat shrink from someone like MM Electrical, an electrical wholesaler. It seems to have a resin or something in there so it not only shrinks but seals and bonds as well. Not easy to remove but I don't usually want to pull my soldered joins apart. It stays tubular as well unlike some of the cheap stuff that flattens and kinks easily.
  23. Moneybox
    I've lagged my exhaust manifolds and muffler mainly to protect the many hoses. Since I had to rebuild No.2 pipe it has a slight dogleg too so that the filter can be removed. Neither of these is an allowable modification but necessary in my opinion.
  24. Moneybox
    34 years ago we did a trip to Ayres Rock and took the aboriginal tour around the base. The old gin showed us how they extracted the resin from the base of the spinifex grass by placing it into a coolamon and belting it with a stick. The resin mixed with fragments of grass, then she heated the coolamon over an open fire melting the contents into a bitumen like goo. She then demonstrated its use for holding stone spear tips and axe heads in place forming the hot solution with her bare hands. Each of the children received a stick with a ball of resin on the end, like a lolly pop. She (or the translator) said to reuse it just reheat it and that's all they had to do to change a spear tip or axe head. My son still has his memento that he received at 8yrs of age.
  25. Moneybox
    It wouldn't matter if the spinifex was green or dry, I've seen green patches of spinifex sending flames 6m into the air. We often camp in spinifex country and take a lot of care to contain the fire because once ignited there's no stopping it. It would make a very bumpy landing area too.
×
×
  • Create New...