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Geoff_H

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Everything posted by Geoff_H

  1. Geoff_H
    Ian, how do I start a blog of my aircraft build? Is that ok with you?
  2. Geoff_H
    I am a habitual user of this site. Can I get notified on my android of new posts? I would like to see blogs of what people are doing! Be it Recreational aircraft, GA Aircraft, regular public transport, model in fact anything that is above ground and uses air to support it, even hovercraft. All can be recreation of some sort. I would also love to see pics of cars being restored, maybe not aircraft but still of interest. I have not blogged my aircraft, I will, but I get all sorts of agro from she who must be obeyed.
  3. Geoff_H
    I left Facebook after criticism from my left wing family of my right wing views. Total intolerance and criticism. Why be criticized. I look to this site to exchange information about mother nature and our battle with her to fly. I need to build cowlings, the thread was just what I wanted. But I am not good with writing, a little Asperger's, I got lost in the words. I am guessing many of the people interested in this website maybe similar to me. I would like to see pictures of some of the ideas and methods. Open discussion on all aspects of aircraft big and tiny. Of all types of ways of doing things. An open forum to exchange ideas freely and without fear of being criticized for anything. I think that the ability to ask a How do I question would attract persons like myself. There seems to be a lot of us if the what else do you do thread is any indication. When I do a google search on an aircraft technical issue I find it surprising how many times I get refered to this site of some years ago.
  4. Geoff_H
    Many years ago I read a report from a retiring six crash investigator. He said: 95% of accidents involving death the pilot was doing something illegal at the time of the accident 1% was bad pilot training 1% was bad maintenance 1% was pilot medical episode 1% was something I can not remember, old age memory. 1% was bloody bad luck So I used this as my philosophy, fly legal, it is legal for a reason. Seen me safe for 40 years of flying. Still have a class2 med. Reaction time is still in the .3 seconds. If this goes I will retire from flying.
  5. Geoff_H
    I will be ok in the test ? Turn on lane assistant and let the car steer itself. Just have to tap the steering wheel every few seconds. It can be scary, cars follow the centre during turns, drivers tend to go towards the inner side of the corner. First few times you think the car is not steering correctly.
  6. Geoff_H
    I am old. Waiting for my medical episode while driving. Bought a car that automatically applied brakes for pedestrians, walls etc, other cars inline of sight and if my face becomes unresponsive. I figure that I may not create a serious "problem" and be able to continue driving. With a licence continue flying...... maybe not.
  7. Geoff_H
    Now retired my time is split between Gym ( 3 days per week), grandchildren, and engineering. Retired 6 years ago now designing and building small aircraft with extensive use of 3d printing. Redesigned 3d printer to use carbon infused Nylon.
  8. Geoff_H
    I meant the main passenger door. But the same seal was used. Passenger door could not be locked once inside so it came open with cheap seal.
  9. Geoff_H
    Yes. Those baggage doors are actually quite heavy. I bet it came open for 2 reasons. One door not locked in flight. Two, he was using a generic door seal rather than the $$$ Mooney one. Don't know why but my main door kept coming open with a generic seal. Bought the Mooney one, no more problems.
  10. Geoff_H
    Mooney aircraft really rattle on rough ground if the rubber springs in the suspension are tired. Suspension hits metal stops.
  11. Geoff_H
    Sure Nev, just thought that it was interesting the way Mooney did trim. I was warned that a baggage door coming off had killed a pilot some years ago. Door damaged the control ability of the aircraft, don't know how.
  12. Geoff_H
    The Mooney does not have an altitude trim on the tail. Vertical trim is achieved by tilting the tail come tilts about a pivot just behind the baggage compartment.
  13. Geoff_H
    On an RFID the speed indication changes colour with speed according to what you should be doing you don't even have to read the number just look for the colour. I love EFIS
  14. Geoff_H
    During the last 50 years of my career I programmed control systems and display systems. Most displays used digital systems for the process variables. I became very used to reading numbers rather than reading analogue systems. So my cars display digital number. I installed a digital EFIS system, I love it and read it very easily, everything in one place so no need to scan like we used to do. A mate of mine absolutely hates the number system. I guess it depends upon what you get used to.
  15. Geoff_H
    A joke told the meat by an American: What do you call a person who owns an English car with a Lucas electrical system? A pedestrian.
  16. Geoff_H
    One feature that the Mooney has is the ability for the engine to be tipped forward to work on the rear of the engine. Nice feature.
  17. Geoff_H
    I was lucky enough to see the Spitfire that col pay was rebuilding whilst it was hundreds of pieces of all different shapes and sizes on the ground. 250k rivets. Every rivet needed to be drilled out to an oversize and re riveted. In wartime the design life of the aircraft was 200hours. Rivet holes were oversized for the rivet. This allowed the ladies making the Spitfires, the unsung heroes, put an aircraft together quicker.
  18. Geoff_H
    Yes don't go near those damed fangled flying machines, the good old horse for me ?
  19. Geoff_H
    Toyota Patent Suggests a High-Compression Diesel Truck Engine May Be in the Works Toyota look like they are developing a high efficiency engine. Toyota Supra already use a dual cycle BMW engine. 40% efficiency announced in the article is huge. Best Otto cycle engine efficiency available is around 30%. Increasing the range of an aircraft or better still free some aircraft weight up for other purposes.
  20. Geoff_H
    Turbo, I have heard about sparkles engine technology. I thought at one stage my vehicle may have had one. However I found spark systems. Are they for starting, what can you tell about sparkless engines. Attached images is my engine with the cover removed
  21. Geoff_H
    I have been researching dual cycle engine after I noticed that mine has a relatively low inlet manifold pressure at full power. I believe that the manifold pressure for 260hp/lire@3000rpm may only need to be about 2bar. Consider the first part of the cycle, Otto cycle with a charge of full air some fuel ignited by the spark plug. Pressure extremely quickly rises. Normally in the Otto cycle this pressure would decay as the piston moves down. But now convert to diesel and inject fuel in a constant pressure diesel cycle. In reality it does drop but not as much as an Otto. The pressure vs volume graph shows this rise then not decaying as much. I have not read that this is the case, but seems plausible.
  22. Geoff_H
    The Hurricane had more kills than the Spitfire. Sure it attacked slow moving bombers, the Spitfire fought fighters in general. Buy the Hurricane had one huge advantage over the Spitfire, it's availability was significantly better. A bullet through the wing of the Hurricane was a simple airfield patch, the Spitfire was so complex that offer the smallest damage needed to be repaired at the factory with complex equipment. I believe that both aircraft deserve the same amount of adoration.
  23. Geoff_H
    I would expect the manifold pressure would be somewhere in the 2.5to 3bar, Mercedes did not publish a lot of data on their current technology limited engine. The efficiency is higher than a diesel of the same compression ratio, so this would reduce temperatures somewhat. Specifically designed pistons and crankshaft would be needed. I do think that your comment about gyroscopic effects could be a very real project killer, in a car not significant, in an aircraft very significant. The dual cycle starts every cycle as an Otto cycle, then becomes a diesel cycle on gasoline. Given that given the same compression ratio an Otto cycle engine is more efficient than a diesel the dual engine uses the constant volume of the Otto to increase the pressure in the cylinder then starts injecting very high pressure gasoline in a diesel cycle constant pressure. Best of both cycles. Many manufacturers are now using it. Some are saying that they may drop diesel engines from their range as these engines offer better efficiency.
  24. Geoff_H
    I read from a Mercedes engine that would normally run st 6500RPM. 215HP from 1 litre. Any combination of speeds are possible. Not a lot of extra HP from 6500RPM so why use a gearbox? Extra weight for little gain. However from the little interest shown here for a dual cycle engine with a massive HP per litre and 30% promote fuel efficiency over an Otto cycle I thought that people on this site had little interest in such an engine. I certainly drive two cars, both with the dual cycle engines and am amazed at hp and fuel efficiency. I think that a reduction in size of an aircraft engine from 5litre to one litre would reduce the weight so much that the weight of liquid cooling and dual electrical would be great. More range from increased efficiency.
  25. Geoff_H
    The Porsche engine failed because it too heavy compared to its competitors Lycoming and continental. I believe that one of the modern engines that use a dual cycle engine would be so much lighter. Run 1 litre at 3000rpm without gearbox, dual electrical and liquid cooled can put out 160hp. Efficiency of 40% is easily achieved! As good as any diesel cycle! Mercedes, BMW and Audi make dual cycle engines.
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