Question size model for OS Max 111 .15

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  • #40349
    Anonymous
    Inactive

    What would be a good model for this engine on nostalgia? I also have a Hunter 3.46 diesel that runs strong and would like to make something for it. The ED Hunter is a repro worked on by Areo-Dyne several years ago. Here in Tucson it is way to hot to fly unless you get up real early. So I will build until weather gets below 110.
    If anybody in Tucson wants to relate to FF drop me a line. I would be glad to hear from you. Something about the smell of DT fuse early in the morning. Smells like Victory!! Regards,Dan

    #42493
    Dean McGinnes
    Participant

    Get a plan for the 1/2A T-Bird. Enlarge to 400 sq in at a Kinkos. Contact me via my email address for mods.

    flydean@worldnet.att.net

    Fit a reliable engine and DT timer. Recommend Texas Timers 2-Function with pinch off. I think it is also called the Max-III Timer.

    Get a Walston or other type tracker and a good pair of binoculars.

    Put gas in your chase bike, and enjoy.

    #42494
    Anonymous
    Inactive

    @dankar wrote:

    What would be a good model for this engine on nostalgia? I also have a Hunter 3.46 diesel that runs strong and would like to make something for it. The ED Hunter is a repro worked on by Areo-Dyne several years ago. Here in Tucson it is way to hot to fly unless you get up real early. So I will build until weather gets below 110.
    If anybody in Tucson wants to relate to FF drop me a line. I would be glad to hear from you. Something about the small of DT fuse early in the morning. Smells like Victory!! Regards,Dan

    Good evening gentleman. I fly a scaled up version of Dan Sobala’s GEEF which has a 420 SQ IN wing. The OS .15 Mk III pulls it up very strongly. Out of the last 8 flight’s, only one was not a max (cat II). I have also flown a 450 SQ IN hoosier hotshot without any difficulty. Best of luck… George

    #42495
    Anonymous
    Inactive

    It’s amazing the control line fliers you find in this forum but we digress.
    I would consider 2 English designs called the Swiss Miss (Dec 1954 AM) and the Creep (1955 AM) as suitable for the OS15, why scale things up?
    If I were look a little harder I would find other suitable designs (like the Zoot Suit, I’m biased) and their performance would give most Americal designs a run for their money. Comments anyone? 😆



    #42496
    Dean McGinnes
    Participant

    We scale designs up or down for two reasons.

    1. It is allowed by the rules

    2. This particular design was originally for 1/2A @ 239 sq in.

    The Zoot Suit and others would be fine alternatives. Also Lucky Lindy.

    #42497
    JIM MOSELEY
    Participant

    My vote is for the ‘Creep’ – have built several over the years, from when first published to one flying present day in both original size for OSMax.15 and scaled for 1/2A (Medallion) and 1/4A. Will outclimb most, glide with the best but .. do include a shade of incidence and a touch of spiral in the climb; the 0-0 pattern on the plan works fine until a faulty transition occurs and the airplane comes back down to you…. fast.

    #42498
    gos
    Participant

    Welcome Pelaero.

    Swiss Miss, a very good thing—15 to 29 power, 58in span, and got 2nd in the W/C in ’54 in the USA.
    I have built 3 of them, Elfin 2.49 beam, Oliver Tiger and the one l have now is K&B Torp greenhead 15 powered—-great flyers.

    Creep, have one with a Cox TD .09, probably a little underpowered, but it’s a nice flyer, and yes Jim l did build in a spot of incidence.
    l built it in the hope that Nos Gas may kick off in OZ, but at this stage no such luck.

    Re. the scaling up and down, am fully aware it’s okay by the rules, but l am not in favour of it, l feel it’s nice to build ’em as they were and lets face it there are so many to choose from in so many sizes.
    Don’t wish to start a ‘war’


    just my view. 🙂

    #42499
    Anonymous
    Inactive

    The “Hustler” was approved two months ago. It will appear in the NFFS digest in the next few months.

    It is perfect for the OS MAX .15. It will be a real performer. I flew that model in the FAI class in 1958-64 at 26.5 ounces, and it went well at that weight. NOS you can build it much lighter. About 430 square inches in a high thrust design.

    It is a durable model that will hold up in windy conditions. I flew mine for 8 years before it got so oil soaked it could no longer be repaired.

    Still have the bones.

    #42500
    JIM MOSELEY
    Participant

    >The “Hustler”

    The Jepson hithrust design? Flat c/section, swept tips, underfin?

    If so .. I flew one of these, years ago, with SuperTigre .23; spectacular machine.

    #42501
    Anonymous
    Inactive

    Hi every one
    Seems I have got the interest movers and shakers regarding this post but the second part of Dankars question dealt with the ED Hunter and while Iam not 100% certain of its eligability, the Alert would be a good candidate for this engine, comments? 🙄

    #42502
    JIM MOSELEY
    Participant

    > Flat c/section, swept tips, underfin?

    Opps…brainfart .. was thinking of a different design; Hustler has polyhedral and parallel chord wing. I built two in early ’60s, one as per plan but lighter, with TD15, the other scaled down as a TD.049 FAI model. Don’t recall much about the .15 model but the 1/2A was a screamer.. but little glide with small area and FAI weight!

    Pulled out my copy of the ‘Timely’ plan .. hmm.. interesting change from NosGas pylons.

    #42503
    JIM MOSELEY
    Participant

    The Hunter is a good engine, a little heavy and not really thought of as a competitive F/F engine in the ’50’s, though it has lately found its uses in SAM Oldtime Gas where its weight is of less significance.

    The ‘Alert’ is a recognised OT design

    #42504
    gos
    Participant

    Just as a matter of interest (if you care?) in OZ we only have one vintage class, and that’s for models pre-dating 1955, same with engines.

    Replica engines are okay, as are engines originally built pre ’55 and the same model made after this date, as long as it’s the same–ie FOX 35, seems it’s the same inside as it was in the 50’s.

    We run 3 classes—-Glider, Rubber & Power and give 2 bonus points per year to models up to 1954


    ie a Playboy Snr. 1941 gets 26 bonus, so only needs 154 secs to max.

    l used a Jeckyl & Hyde rubber model from 1954 Aeromodeller to win the OZ Nats couple of weeks ago, so having no bonus points l HAD to do 180 each flight—-and it did.

    Our rules are good and work well, and are now close to 30 years old and l do wonder if we could have perhaps a Nos. event to bring in more designs. Perhaps 50s Nostalga?????????

    #42505
    Anonymous
    Inactive

    I tried that 3 years ago and got howled down by several “stick-in-the muds” that carried a lot of weight and voted the changes out. Time for someone else to have a go, you got my support. 😀

    #42506
    BOB STALICK
    Participant

    I have flown a number of .15 sized Nostalgia models in the past, and the ones I like are as follows:
    1.Y-Bar 360, which is scaled up from the YBar plans which are carried by NFFS Plans Service.
    2. Eureka, which was originally carried in the Zaic Yearbook (1956, I think) and is originally in .15 size. It has close to 360 sq. in. in the wing. I flew one of these with an OS Max .15 for many years and was competitive with it. NFFS Plans Service sells the full sized plans. The Nos Legal version has undercamber in the wing.
    3. I have not built an A sized Geef, but I have seen plenty of them in the winners circle and would not mind flying one. These have around 420 sq. in. in the wing, so they are a bit bigger.
    4. Bruce Hannah Jr. flies a 420 sq. in Fubar X with his OS .15 and it is a consistent winner. It looks as good as it flies, but it is a bit overweight, according to Bruce.
    Good luck with your choices.
    Bob Stalick

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