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About RFguy

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  • Birthday 27/12/1970


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  1. The UL260i would be a good+suitable upgrade to improve an 80HP powered jabiru aircraft like the J170. At 21k USD that's a competitive alternative to the 912ULS (about 24kUSD with most of the accessories you need) .
  2. I presume aero manouvers may be classed - strongly positive, neutral, strongly negative G, and duration . Some you can do in some acft, some not. Like what the hell happens inside the float bowl during suastained neutral or neg G antics ??? (bring on fuel injection) .
  3. Hi Jim. yeah those are not so bad, a leak there is not as bad (for mixture leaning == hot EGTs) as a leak at the head. That is a cool region, no hotter than the oil.
  4. Hi Jim Not the inlet plenums. THE O RINGS BETWEEN THE HEAD AND THE INLET MANIFOLD TUBES. YES, THERE ARE O RINGS THERE. iN THE PAST, THERE WAS A GASKET. These O rings are in contact with the head. cheers
  5. I found a good paper to read "Effect of non-uniform airflow on the performance of a parallel-flow heat exchanger considering internal fluid distribution" document source : https://doi.org/10.1016/j.applthermaleng.2020.115685 Now, interesting for this crossflow radiator (aspect = 1.38) square uniform side tanks, no special shapes) as the mass flow rate goes up, so does the variation in distribution of flow. and that the tubes in the middle suffer . A number of different aspect ratios was tested (width/height ratio), and non uniformity of flow distribution increases wit
  6. In my case I have generally, lots of space in the horizontal plane, and little in the vertical plan, so cross flow will give me the most useful geometry from a number of cores perspective . From what I read, getting even flow distribution is more difficult the more pipes you have/longer the tanks. in the wide aspect cross flow, the tanks are short in length (height), and the number of pipes is less. I'm sure there is a expert here that can pipe up on this. If the resistance of the flow in each tube is low compared to the input pressure than the system should se
  7. There are different ranges of those small radiators. No, I won't be using those radiators specifically, they dont have sufficient pressure capability. just an example of what is out there . But there are a range of like things for cooling electronics in harsh vibration environments. but The motorcycle motoX radiators are the most likely - although it really requires a custom job because inevitably the inlets and exits are in the wrong place, and we want crossflow and most of the the motoX are top to bottom, (some are X flow) . Still, brazing or tigging ally pipes into the alu
  8. I've found a mfr that makes some small industrial heat exchanger high performance radiators, all copper, lots of specs. affordable. https://www.alphacool.com/alphacool-nexxxos-v.2-radiatoren https://www.alphacool.com/download/ENG_1015512_NexXxoS_V2_XT45_240.pdf https://www.alphacool.com/shop/radiators/radiators/240-mm/20477/alphacool-nexxxos-xt45-full-copper-x-flow-240mm-radiator They'll fit nicely in the airflow in the cowling inlets with a minor enlargement. All shapes and sizes off the shelf, about $100 per unit. But they weigh a kilo each. alot of copper.
  9. no change of heart from me Skippy, just thought you might like some more ideas. radiators are still best to go and face the wind, given that I already have cowling openings ....
  10. https://xplrcreate.com/2013/06/15/naca-duct-vs-scoop/ 4", 4m length length local https://racetechseats.com.au/shop/ducting/silicone-duct-hose
  11. Skippy while we're online workshopping this something I am thinking about right now is whether I get 2 x motorcycle radiators and put them behind the existing cowling inlets, or use 6" to 8" dia ducting and pipe the air where I can put the radiators somewhere simpler. duct like this : https://airtight.com.au/product/hightempflex/ 6" duct, $200/meter . 6" ID would be 182cm2. Two of those would be a little on the marginal side. (362- I need 440) It might be easier in the cowling to run 2 x 5" ducts per side instea dof a six. each 4" duct is 122cm2, so four in
  12. like I said -YES could cause problems if it flew over the top. but really airlines should be forced to bring their radar altimeters into the 20th century, let alone 21st century. there isnt any excuse for it using WW2 tech.
  13. mmmm. if it flew right over the top of a 5G base station, over irregular terrain (with poor, incoherent reflectivity) then.. maybe yes, if it was pretty dumb, and most aviation avionics is just that...
  14. sounds great. Ensure that the power connectors and/or pump power switches are intrinsically safe (to avoid explosion) (or the switches/connectors can be nowhere near vapour). something like this walrus ? https://www.efisolutions.com.au/straight-aluminium-quick-release-dry-break-an6
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