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R Austin

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About R Austin

  • Rank
    Member
  • Birthday 05/06/1957

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  • Aircraft
    Sera 173
  • Location
    Gold Coast
  • Country
    Australia

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  1. A few clarifications re VH-SRS resulting from recent questions off this thread.... - The target maximum continuous cruise speed (MCCS) for VH-SRS was 168 knots. The actual MCCS has exceeded this and is currently 172.3 knots using Rotax’s latest maximum continuous cruise power for 95 RON fuel (91 US), or 174 knots using 98 RON (93 US) or avgas, if you like an average of 173.1 knots (199 MPH). - All stated performance numbers are at favourable weights and CG. Variations to these parameters eg adding a passenger will reduce performance. - The aerobatic weight is 430Kg (o
  2. Hi Robin,

     

    Like you I am not too sue of the correct contact system  however I hope you get this:

     

    My phone number is 0499030659  & my direct email is [email protected] bigpond.com.au  (note: the spelling scan is correct and accidently similar to my name) I am located about 3  km from The Oaks airfield NSW just west of Camden.

     

    Let me know if you get this - the last person I replied too gave no indication of having received my communique

     

    I will appreciate a chat almost any time.

     

    Sean Griffin

    1. skippydiesel

      skippydiesel

      Hi Robin,

       

      Like you I am not too sue of the correct contact system  however I hope you get this:

       

      My phone number is 0499030659  & my direct email is [email protected] bigpond.com.au  (note: the spelling scan is correct and accidently similar to my name) I am located about 3  km from The Oaks airfield NSW just west of Camden.

       

      Let me know if you get this - the last person I replied too gave no indication of having received my communique

       

      I will appreciate a chat almost any time.

       

      Sean Griffin

  3. Your interpretation of my explanation of 2 blade vs 3 blade Is correct. And thanks for the invite. I may even do that! Cheers.
  4. It’s hard to predict what effect a CS will have on your plane. if your existing prop is really fine, then it will be all in cruise and top end. If it’s really coarse, then the improvements will be in TO and climb. it also depends on target cruise density altitude among other things. I’m pretty sure you understand that. It can be calculated if you have accurate MP, RPM and density altitude for a particular max speed scenario now. If you are running out of revs badly now, 10+ kts is quite plausible. Just don’t have enough info and don’t want you to have unrealistic expectations if
  5. I only went 3 blade cause this is my last major project and I didn’t want any compromises this time around. Spare no expense! Ha ha! Also, as I get older, comfort and smoothness is getting more important to me. Prior to this I have always gone with 2 blade. For ultimate performance, 2 blade is ahead based on all my testing., no question. As they say, 2 for go, 3 for show! But (I might be biased) that 3 blade does look good! Last thought. On some planes, the 3 blade makes the bottom cowl really hard to get off, particularly Sonerai non stretched versions.
  6. Hi SkippyD. In reply to your prop query. You are in the speed range where you might just justify a CS prop. But you will have the same expense as a faster plane, with less benefit, this makes it a hard decision. I imagine that’s why Cessna couldn’t quite justify one on the 172, but made it standard on faster models. On yours, depending on where you are pitched now, I t will give a bit more go, or at least liveability at both ends, but another benefit is that you can always find a smooth spot for cruise at any speed. Something that fixed props don’t always do. re 3 vs 2 blade
  7. Hi Robin,

     

    By way of introduction:

     

    I am not sure when/how I came across your article on the development & exploits of VH-SGS but it must be many years back - about the time you put her up for sale.

     

    As I have mentioned in my Forum conversation - what fascinates me is what you have achieved with so little in the way of power and what must be a fundamentally sound aerodynamic/airframe design but otherwise unspectacular looking aircraft (no offence to Mr Monnett).

     

    As a person of European (rather than N American) leaning, I admire small nippy economical  sports cars rather than the big V8's. Your adaption of the Soneri seems to neatly fit into this philosophy.

     

    Over the years I have "measured" all small aircraft performance claims against VH-SGS and with but a few exceptions, come to the conclusion that they are at best wishful thinking but most likely just lies.

     

    Some of my Forum correspondents think I am obsessed with speed - not so. In aircraft, I see speed and hp/fuel consumption as a measure of efficiency. I dont necessarily want to fly at max cruise speed all the time but like the idea of trying to get my aircraft as efficient as it can be, within its physical limitations.

     

    I have written to you befor asking if you know of VH-SGS  current situation( A Forum member suggested she was not much used) and would the owner be interested in selling.

     

    Regards

     

    Sean Griffin / Skippydiesel  

     

    E-mail: [email protected]

    1. R Austin

      R Austin

      Hi Sean

      Sorry, I missed this post, just saw it for the first time.

      Perhaps you would like to give me your phone number and we can chat re your ideas.

      I’m assuming I’m using this technology right and this is a private chat?

      Robin

    2. R Austin

      R Austin

      Also, perhaps copy your reply in the messages section if you like. 
      I keep losing private posts on this section.

      thx

  8. Hi skippydiesel and anyone else interested. That sounds bad, can I ask your first name please? i will respond to your prop question soon. Also. Thought you may be interested, I’m having a parallel conversation on the Sonerai.net site under “world record plane 12 years on” covering similar subject matter if you wish to tune in. cheers Robin
  9. I spoke to Mr Monnett senior and junior at Oshkosh in 2011. Not specifically on that specific idea, but I did offer to get involved with the onex in a drag reduction role. They seemed little interested so I left it at that. It’s not unusual for designers over the years to seem perhaps quietly offended by others messing with their design. I detected that may have been the case here, but couldn’t be sure.
  10. Hi Skippydiesel. Sorry, embarrassingly your name escapes me even though you’re my number 1 fan! Thank you sincerely for that and the kind words you write. I’ll let you know if I discover a number 2 ha ha. Re prop... the blades are C65AY Sensenich. Hub and electric CSU, spinner etc are Airmaster. All commercially available and damn good stuff too. Very well engineered. All integrated by Airmaster as turn key product. To be honest, can’t tell you min ground roll as I operate off gravel strip and am quite conservative with power application. Not stol but still quite short. F
  11. Hi Lyle. Good to hear from you! Yes, the wing fold is essentially as per original Sonerai plans, but I just refined it all the way through construction so that it is a genuine easy and fast 1 man job. I trailer it and set it up for each days flying. About 140 times so far. Keeps getting a bit quicker as I think of little refinements. 5 min to unload and 5 min to assemble and preflight. Quicker if I need to be. Typically 10 minutes from arriving at the airfield till turning the key. Might be a bit of a job retrofitting it to a finished aircraft though! Cheers Robin
  12. Ok, too much resolution. Won’t open now. Sorry about the false starts, but it seems I can’t delete once posting. 1 last try.
  13. The pics are a bit grainy. I compressed them too much. I’ll try again.
  14. Hi. Here is the description of SRS that I promised. Apologies for the formatting. SERA-173 (VH SRS) is the 3rd aircraft in my journey of developing evolutionary aircrafts originally based on the 1970 Monnett Sonerai II design. The mission was to build the smallest most efficient 2 seat aircraft outside, with the biggest achievable cockpit inside. SRS is likely the first Rotax 912 aircraft capable of carrying 2 large adults whilst achieving genuine RV series performance. Although maintaining Sonerai heritage, SRS is considered sufficiently divergent from the original
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