CriCri MC-15 in NZ

Discussion in 'The light stuff area' started by MadRocketScientist, Jun 19, 2009.

Help Support HomeBuiltAirplanes Forum by donating:

  1. Jul 11, 2014 #701

    MadRocketScientist

    MadRocketScientist

    MadRocketScientist

    Well-Known Member

    Joined:
    May 17, 2009
    Messages:
    1,442
    Likes Received:
    898
    Location:
    Canterbury, New Zealand, Earth, Milky Way Galaxy.
    No wiring guide with this one;) and that's just for one engine! It's not as bad as it looks:gig:

     
  2. Jul 11, 2014 #702

    Topaz

    Topaz

    Topaz

    Super Moderator Staff Member

    Joined:
    Jul 30, 2005
    Messages:
    13,873
    Likes Received:
    5,484
    Location:
    Orange County, California
    That's good! :gig:
     
  3. Jul 12, 2014 #703

    MadRocketScientist

    MadRocketScientist

    MadRocketScientist

    Well-Known Member

    Joined:
    May 17, 2009
    Messages:
    1,442
    Likes Received:
    898
    Location:
    Canterbury, New Zealand, Earth, Milky Way Galaxy.
    Making progress on the test stand! Still a lot to do before I can fire this one up:cry: The exhausts need to be fabricated, the fuel tank installed and plumbed, wiring finished etc etc.... the engine mount needs to be made in aluminium.... you get the idea...:ponder:

    I think the engines are going to be mounted flat, its far easier to fit the exhausts past the engine mount.
    Started mocking up the two in to one exhausts for the tuned pipe. Its going to end up slightly offset to keep the pipe lengths the same. I may run the engine on straight pipes to start with :roll: That should annoy the neighbors!!!

    Shannon.
     

    Attached Files:

  4. Jul 13, 2014 #704

    aligold

    aligold

    aligold

    Member

    Joined:
    Jul 6, 2014
    Messages:
    5
    Likes Received:
    0
    Location:
    usa
    hey Shannon . would you like to offer a kit?
     
  5. Jul 13, 2014 #705

    MadRocketScientist

    MadRocketScientist

    MadRocketScientist

    Well-Known Member

    Joined:
    May 17, 2009
    Messages:
    1,442
    Likes Received:
    898
    Location:
    Canterbury, New Zealand, Earth, Milky Way Galaxy.
    I cannot offer kits as the plans are available elsewhere. But I can provide whatever parts you would need if that helps?;)

     
  6. Jul 13, 2014 #706

    haiqu

    haiqu

    haiqu

    Well-Known Member

    Joined:
    Mar 29, 2011
    Messages:
    274
    Likes Received:
    39
    Location:
    Australia & New Zealand
    Well, I'm now the proud owner of a Class 1 microlight. I have no idea what it is and neither does the seller. Maybe someone here will recognise it. Rotax 447 and trailer alone are worth what I paid for it, so essentially I got the airframe free.

    microlighth.jpg microlight2.jpg microlight4.jpg microlight6.jpg
     
    litespeed likes this.
  7. Jul 17, 2014 #707

    MadRocketScientist

    MadRocketScientist

    MadRocketScientist

    Well-Known Member

    Joined:
    May 17, 2009
    Messages:
    1,442
    Likes Received:
    898
    Location:
    Canterbury, New Zealand, Earth, Milky Way Galaxy.
    More progress, was it worth the long long wait for the build to continue? :gig:

    Yesterday I machined the rear engine cover to reduce the clearance of the rotary valve. Reading the manuals for the jetski two strokes they run the clearance at 0.3mm +-0.05mm. They also state not to go under 0.25mm as the heat changes in the housing may cause the valve to bind and gall. Given that the ZDZ is a smaller engine I think the clearances could be used with no problems. I certainly think you don't want them any bigger! Symptoms of an excessive rotary valve clearance include rough idle and not so smooth throttle transitions.

    I checked the clearance on the ZDZ by placing some small pieces of solder inside the housing and bolting it down. The clearance was quite excessive at 0.56mm. I set the rear cover up in the cnc and milled 0.26mm off it. Ignore the big "E" as I used a scrap of 30mm thick clear acrylic to mill the mounting spots to bolt the housing onto. Much easier to set things up level with a freshly machined surface. Then I used a dial gauge to check the level of the inner housing where the valve runs. That was level to within 0.02mm so then I machined the surface. I hit it even more precision than it was originally with three final clearance measurements around the outside being 0.30, 0.30 and 0.31 mm :ban:. Lapping the surface with some 1000 grit sandpaper took it down 0.02mm further but it will get a little thicker when it has the spray gasket applied for sealing on final assembly. I may not be able to tell if this has done anything to the performance but it good to know where the clearance is at.

    Today I did some more on the test stand. I want to test out the actual engine mount design that will be used on the plane at the same time. The angle of steel will be bolted to the front of the plywood and the engine mounted onto the steel with the aluminium mount. I can flip the steel piece left or right to simulate the motor mounting on each side of the plane

    Also attached are some pics of the comparison of cleaning up of the pistons, not sure how I missed posting them the other week??

    Shannon.
     

    Attached Files:

  8. Jul 17, 2014 #708

    MadRocketScientist

    MadRocketScientist

    MadRocketScientist

    Well-Known Member

    Joined:
    May 17, 2009
    Messages:
    1,442
    Likes Received:
    898
    Location:
    Canterbury, New Zealand, Earth, Milky Way Galaxy.

    Attached Files:

    Jon Ferguson likes this.
  9. Jul 17, 2014 #709

    Jon Ferguson

    Jon Ferguson

    Jon Ferguson

    Well-Known Member

    Joined:
    Dec 15, 2011
    Messages:
    827
    Likes Received:
    382
    Location:
    Harpers Ferry, WV
    That's a cool little motor.
     
    MadRocketScientist likes this.
  10. Jul 18, 2014 #710

    haiqu

    haiqu

    haiqu

    Well-Known Member

    Joined:
    Mar 29, 2011
    Messages:
    274
    Likes Received:
    39
    Location:
    Australia & New Zealand
    US$1395 for a t(r)oy engine, on special? Wau. I didn't pay much more for the aircraft above, with a low hours Rotax 447 and a trailer. Happy.:ban:

    Found out what it is, the seller sent me a photo of the build plate. Homebuilt, type "Rainbow Chaser" S/N 001. Probably a prototype.
     
    MadRocketScientist likes this.
  11. Jul 21, 2014 #711

    MadRocketScientist

    MadRocketScientist

    MadRocketScientist

    Well-Known Member

    Joined:
    May 17, 2009
    Messages:
    1,442
    Likes Received:
    898
    Location:
    Canterbury, New Zealand, Earth, Milky Way Galaxy.
    I have been working on mapping the ignition advance of the ignition modules I have here. Turns out that the Rcexl units I have are set at the advanced position and the software in them retards the firing when it senses fast enough rpm. The issue is when it takes around 400rpm for the retard to kick in. On a smaller motor, say 50cc, this isn't an issue as it is really easy to hand prop a small engine fast enough for it to not kick back. With a bigger engine like the ZDZ210, the kickback can be rather vicious if the timing is fully advanced when they are hand propped:mad2:. My units seem to be fully retarded around 110 rpm so may be fine!

    The idea is to make sure the retard kicks in :gig: at a low enough rpm for it to be a non issue.

    The Falcon ignition units that came with the motors have a bad track record as far as reliability is concerned although they are set at the retarded position and the software sorts out the advance. Helps a lot with kickback when hand propping :).

    Sure is interesting reading all about the effects of timing on two stroke engines.

    Shannon.
     

    Attached Files:

    Joe Fisher and Xanadrone like this.
  12. Jul 21, 2014 #712

    MadRocketScientist

    MadRocketScientist

    MadRocketScientist

    Well-Known Member

    Joined:
    May 17, 2009
    Messages:
    1,442
    Likes Received:
    898
    Location:
    Canterbury, New Zealand, Earth, Milky Way Galaxy.
    And now one of the Falcon ignition units that came with the motor is flaking out, works fine when cold but once it runs for a few minutes it goes nuts and fires all over the place. Didnt even get to test the timing properly on this one:ponder:, oh well back to testing the Rcexl unit:).

    Shannon.
     
  13. Jul 21, 2014 #713

    Xanadrone

    Xanadrone

    Xanadrone

    Well-Known Member

    Joined:
    Nov 24, 2011
    Messages:
    195
    Likes Received:
    43
    Location:
    Bucharest Romania
    Yep, some of the original ZDZ / Falcon ignitions are crappy (me too I had years ago a forced RC-landing with a 60 cc ZDZ because of ignition failure, moving then to MVVS 58cc - a bit more thirsty, but very reliable) - so, good move to Rcexl, Shannon! (well, I guess your engines are not so much... ZDZs :gig: after all your changes.)
    But have you ever considered the (more expensive, complex and heavier) E-start sollution?
    I'm anyway eager to see your conclusions after the first engine-tests on the bench!

    P.S. That 180 cc RV ZDZ for 1K euros is also a great offer indeed (in Europe it's 1.549 euros) and I'm inclined to choose it for my microlight project, mainly because of its lightness (3.3 kg for +19 HP instead of 4.9 kg for the +22 HP of the bigger 210).
     
  14. Jul 21, 2014 #714

    MadRocketScientist

    MadRocketScientist

    MadRocketScientist

    Well-Known Member

    Joined:
    May 17, 2009
    Messages:
    1,442
    Likes Received:
    898
    Location:
    Canterbury, New Zealand, Earth, Milky Way Galaxy.
    I have thought about starters, I just want to get these up and running before adding more complexity!;) I may need more weight up front to get the CriCri to balance. Starters and alternators will fix that.

    I am interested to see how reliable the ZDZ180 turns out to be, every new ZDZ engine type seems to be that much better than the last. From pictures of parts of the 180 they have improved the design over the 210.:)

    Shannon.
     
  15. Jul 31, 2014 #715

    MadRocketScientist

    MadRocketScientist

    MadRocketScientist

    Well-Known Member

    Joined:
    May 17, 2009
    Messages:
    1,442
    Likes Received:
    898
    Location:
    Canterbury, New Zealand, Earth, Milky Way Galaxy.
    I have been working on a solid model over the last few days, still a bit of work to go till its right.

    Shannon.
     

    Attached Files:

    • Prop.jpg
      Prop.jpg
      File size:
      16.7 KB
      Views:
      208
  16. Jul 31, 2014 #716

    MadRocketScientist

    MadRocketScientist

    MadRocketScientist

    Well-Known Member

    Joined:
    May 17, 2009
    Messages:
    1,442
    Likes Received:
    898
    Location:
    Canterbury, New Zealand, Earth, Milky Way Galaxy.
    Just a bit of Mahogany ;)
     

    Attached Files:

    Joe Fisher, Jon Ferguson and Topaz like this.
  17. Aug 6, 2014 #717

    haiqu

    haiqu

    haiqu

    Well-Known Member

    Joined:
    Mar 29, 2011
    Messages:
    274
    Likes Received:
    39
    Location:
    Australia & New Zealand
  18. Aug 11, 2014 #718

    MadRocketScientist

    MadRocketScientist

    MadRocketScientist

    Well-Known Member

    Joined:
    May 17, 2009
    Messages:
    1,442
    Likes Received:
    898
    Location:
    Canterbury, New Zealand, Earth, Milky Way Galaxy.
    I haven't posted any updates for a week or so but that doesn't mean nothing is happening:gig:

    Ended up fixing a friends chainsaw and now it goes better than it ever did. A new carb kit and a few other tweaks and its going well, although it still had a crazy rich midrange that I would have liked to sort out...:ermm: The saw wasn't really worth repairing for the time it took but I learned a lot about two strokes by doing so.

    I have finished the test prop for my ZDZ210, few pics below. Some lightweight glass cloth and epoxy should stiffen it up a bit and then I sprayed it with sanding sealer then a clear lacquer top coat.

    Shannon.
     

    Attached Files:

  19. Aug 11, 2014 #719

    MadRocketScientist

    MadRocketScientist

    MadRocketScientist

    Well-Known Member

    Joined:
    May 17, 2009
    Messages:
    1,442
    Likes Received:
    898
    Location:
    Canterbury, New Zealand, Earth, Milky Way Galaxy.
    The MC-30 is another great minimalist aircraft, from reading reviews it still seems to have the difficulty with the engine cost once it has be made airworthy.

     
  20. Aug 23, 2014 #720

    haiqu

    haiqu

    haiqu

    Well-Known Member

    Joined:
    Mar 29, 2011
    Messages:
    274
    Likes Received:
    39
    Location:
    Australia & New Zealand
    Yeah. I contacted the UK Luciole group and evidently the engine upgrades are available only as a kit from Colomban, and very expensively at that.

    On another tack, have you found a reliable supplier of aircraft grade aluminium in NZ or does it all have to be imported? Reason I ask is that I'd like to take a crack at building something eventually.
     

Share This Page



arrow_white