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  1. Old Koreelah

    EarthX Lithium Batteries has new STC's added to their AML list!

    Wonderful to see. That significant reduction in battery weight will affect W&B of some aircraft, especially those with battery mounted far from CoG.
  2. Old Koreelah

    Alternative wheels/brakes

    I fitted cable-operated bicycle discs to my 392kg Jodel. They work well, with very little disk pad wear in over a hundred hours of service.
  3. Old Koreelah

    Fire Extinguisher Systems

    What, no rear view mirror?
  4. Old Koreelah

    Fire Extinguisher Systems

    I installed a fire extinguisher next to my right knee, plumbed to a metal tube exiting above the engine. It’s meant to flood the engine bay and put out the fire. Perhaps a bigger factor is how the pilot reacts to fire. Turning off all fuel sources is a first step (which should including...
  5. Old Koreelah

    Mitsubishi Zero

    To meet the demanding specifications of the IJN (which no other manufacturer thought possible) Mitsubishi made the Zero from a new Sumitomo ally with emphasis on strength and lightness. The tiny few examples that survive, 80+ years later, suffer what one restorer called intercellular corrosion...
  6. Old Koreelah

    Mitsubishi Zero

    A brilliant acheivement that Horikoshi himself might have been proud of! The attention to detail and faithful scale reproduction of almost all aspects of the original is remarkable. I am somewhat qualified to make this observation, having part built a 75% replica which now gathers dust in my...
  7. Old Koreelah

    SONERAI 2, what's your indicated stall speed?

    Very interesting discussion. How accurate is your ASI during the landing phase? One way to reduce errors due to angular airflow is to add an articulated intake to the pitot tube. Forget hi-tech; just add a short length of flexible plastic tube, then plug into it a pitot with its own empenage...
  8. Old Koreelah

    Questions on seat belts/harnesses

    I replaced my tired old 4-pointer with a 5-point harness bought online. Very good price and seems good quality, but damned heavy! I guess it’s a general-purpose product that has to be strong enough to cater for big heavy blokes in dragsters. The extra weight undid quite a lot of my...
  9. Old Koreelah

    Exploring the Potentials of Water Injection to Improve Fuel Consumption and Torque in a Small Displacement Pfi Spark-Ignition Engine

    Water injection can improve your engine and it need not be complex. The second version of the water injector I fitted to my Jabiru 2.2 litre engine works just fine in my Jodel D918. At full throttle a contact powers up a small pump which sprays rainwater directly into the carby intake. Lots of...
  10. Old Koreelah

    Two engines one prop

    Don’t forget Bugatti used this idea 80-odd years ago: https://r.search.yahoo.com/_ylt=Awrg1gqlICVkTHIDORrpQyE5;_ylu=Y29sbwNncTEEcG9zAzMEdnRpZAMEc2VjA3Ny/RV=2/RE=1680183590/RO=10/RU=https%3a%2f%2fsilodrome.com%2fbugatti-100p%2f/RK=2/RS=e.gNXHHeqgNaU3AJNm_93YOKDwU-
  11. Old Koreelah

    De Havilland shock absorber design

    P.S. The Jodel’s square u/c tubes do a good job of keeping the wheels aligned, but I discovered the hard way that toe-out (required to make this tail dragger manageable on the ground) is built into the axle’s angle to the leg. Get them back to front and you might ground loop, like I did. P.P.S...
  12. Old Koreelah

    De Havilland shock absorber design

    My D9’s gear legs are very similar to the D185 pictured. I added one urethane block to mine to slightly increase travel and soften the ride. To fit the extra length, I allowing the top rubber block to almost reach the top wing skin and moved the bottoming assembly down a tad. According to the...
  13. Old Koreelah

    De Havilland shock absorber design

    My Jodel D9, built from plans, has this arrangement inside each of its square undercarriage legs.
  14. Old Koreelah

    Rethinking the tip jet propeller

    An amazing aircraft that was operating successfully before most of us were born. The Rotodyne still outperforms anything flying that role today. A tragic loss due to the British being so short of money in the postwar years.
  15. Old Koreelah

    Cowling Exit Air

    Either side, in the low pressure zone above the wing leading edge. To regulate CHTs, my Jodel has vertically-hinged cowl flaps. The low pressure helps suck cooling air thru the engine.
  16. Old Koreelah

    Amazing film 🤣

    This remake is not a patch on the origonal movie with Jimmy Stewart, Dickie Attenbro, Hardy Kruger, Peter Finch, et al.
  17. Old Koreelah

    eBike (cargo bike) hydraulic brakes

    My little Jodel has a pair of bicycle brake levers on the stick. They operate cheap bicycle-type callipers on super-light disks. Very little wear after several hundred landings. Easy to operate the levers independently with a couple of fingers each. The long bicycle cables might have less feel...
  18. Old Koreelah

    Merlin GT with 31" Alaska Bush Wheels - a little crazy, or just plain dumb??

    Big fat bush tyres sure do the job, but has anyone ever fitted motocross wheels and suspension to a bush plane? Much less frontal area but large diameter and actually designed for the sort of abuse a bush plane cops from rough strips.
  19. Old Koreelah

    Keeping a swing over canopy open

    Traditional horizontal sliding canopies have parallel rails; often the rear ends stick out proud of the tapering fuselage. To avoid that, I built mine with a shorts rails at the front and swing arms at the back, so that the canopy both slides and swings. The result is that, when closing, the...
  20. Old Koreelah

    Staples for wing rib fabric attachment?

    Malcolm I used wide aluminium pop rivets on my Jodel’s spruce ribs. First I tested three different attachment methods on a two short rib sections I had removed when installing wing tanks. Stitching worked okay, but was hard to do neatly. Small wood screws with wide washers tended to split the...
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