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  1. jbiplane

    Lighweight opposite 2-stroke engines

    I use manual decompression valves to facilate start of 2-stroke engine with electrical starter. But pilots of paramotors want start-stop engine in a flight. Stop when flying in thermic and launch if dont sucseed. I saw on husqvarna chainsaws automatic decompression valves which actuated by...
  2. jbiplane

    Lighweight opposite 2-stroke engines

    Hello folks. After some experience with Megasquirt and Speeduino my team create new digital injection and ignition board. 2ign +2inj channels 2layers 36x50mm ECU which consists of 80% components produced in Russia and 20% of Chinese components. 100% local possible but would increase PCBA size to...
  3. jbiplane

    Lighweight opposite 2-stroke engines

    We make cruel test = dropped on mesh 2 pieces of carbon 15x15x0,4mm after reed valve and let engine run 5 hours 5800rpm at -18...23C. Kevlar 0.5mm mesh passed this test :) So next step make reed valve seals with integrated mesh.
  4. jbiplane

    Lighweight opposite 2-stroke engines

    Installed mesh in reed valve housing to don't allow broken petals damage whole engine Seems it should not not affect power
  5. jbiplane

    Lighweight opposite 2-stroke engines

    Our new ignition. Energy consumption at 8500rpm about 2watt per cylinder due very high PCBA efficiency.
  6. jbiplane

    Lighweight opposite 2-stroke engines

    At moment my simple fuel injected engines fly up to 6500meters. Just a bit oversized engines with a bit bigger compression ratio and enforced crankshaft+condods to bear overloads on 0 meters altitude.
  7. jbiplane

    Lighweight opposite 2-stroke engines

    No reason in exotic engine configuration. To reach superior fuel efficiency is it enough to squirt fuel at the moment when piston completely close exhaust port or slightly before this. It is technically achievable, but add some weight and complexity. There are a lot of ways to do. Says...
  8. jbiplane

    Lighweight opposite 2-stroke engines

    I developed and tested lighweight DC-CDI ignition module for 2 spark plugs. PCBAs are ready. Trying to place it in relatevelly small enclosure. On the picture below you can see one 3d printed iteration. It will have at least the same spark energy like Ducatti 432385520 but at least 2 times lighter.
  9. jbiplane

    Lighweight opposite 2-stroke engines

    I meant fuel consumption is always better than 340 for 2-strokes I tried for kits 26...800cc. The better numbers are possible, but in very narrow rpm range and very easy overheat engine. With carburetor on Rotax 582 I observe much worse BSFC numbers. There are a low of advertizing numbers...
  10. jbiplane

    Lighweight opposite 2-stroke engines

    I produce fuel injection kits, simple and with full redundancy of ECU PCB, sensors, pumps, spark plugs, injectors... For 2strokes EFI gives BSFC 340 g/hp⋅h or better
  11. jbiplane

    Lighweight opposite 2-stroke engines

    Each year we hear about super engines which will nether become reality... First time Innengine appeared in news in 2019 and in 2023 nothing changed. Even pictures and text of the news. I started new company in Uzbekistan to produce realistic fuel injected boxer 2stroke engines for neighbour...
  12. jbiplane

    Lighweight opposite 2-stroke engines

    Trying post the links of variant 1 and 3 - liquid cooled nikasil version 2x = 67hp, expensive ~500 USD cylinder kit - air cooled with sleeves version 2x = 50hp my air cooled nikasil cylinders which weight 1,1 kg ~300 USD chinese copy of liquid cooled Gilera runner (declared power 19hp per...
  13. jbiplane

    Lighweight opposite 2-stroke engines

    A bit hecitate what to do next (a bit bigger opposite than produced now). Variant 1 use produced here cylinder kits 76mm bore x 61 which make 553cm volume - liquid cooled nikasil version 67hp, expensive ~500 USD cylinder kit - air cooled with sleeves version 50hp, 1, 5 kg heavier ~ 250USD...
  14. jbiplane

    Lighweight opposite 2-stroke engines

    Thanks. I considered Yamaha YFS200 with reworked cylinders :) Are you comfortable with liquid cooled cylinders?
  15. jbiplane

    Lighweight opposite 2-stroke engines

    Cannot answer right now. Before 1Euro = 86Roubles, now 1Euro=60 Roubles (43% cheaper). I have to wait few month when national currency become cheaper or adopt to new reality. Probably it is correct time to upgrade company building, buy some equipment and third side parts like cylinder kits.
  16. jbiplane

    Forum made EFI?

    Micro news. Our injector kits are finally tested at -30+50C and on altitude up to 6000meters on small UAV 40cc and 60cc engines.
  17. jbiplane

    Lighweight opposite 2-stroke engines

    Hi Murry. New version of 294cc engine will be delivered to customer this October. 342…400cc engines still available. I found logistic ways and deliver worldwide ignoring sanctions :) Normally I always have 1...2 assembly kits which use expensive 171...200cc Malossi cylinders. I will produce...
  18. jbiplane

    Lighweight opposite 2-stroke engines

    https://reaa.ru/attachments/izobrazhenie_2022-08-19_184922055-png.513570 New version of my 294cc 30hp Engine
  19. jbiplane

    Lighweight opposite 2-stroke engines

    Thanks. Very nice of you :) But I want 2-engine configuration without essential rework.
  20. jbiplane

    The Lightest Starter for Rotax 2-Strokes

    Now weighing just 2.83kg I use 1274 grammes starters of yamaha overboards + 265 grammes dental crown rings + some adapters to start my 30...60hp 2strokes. It cost me to buy and CNC mill below 200USD, but I dont want spend time and efforts trying to sell it as a kit to individuals.
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