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MYOG: AlpineMid (SoloMid)


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  • #1232638
    t.darrah
    BPL Member

    @thomdarrah

    Locale: Southern Oregon

    I have been working for some time on the idea of a small Mid type shelter for above treeline solo use. I wanted to base my design using exterior V'd hiking poles, in sleeves, to allow the most useable floor space while providing strong shelter support. The shelters low profile allows for a very strong, and wind resistant, pitch. I've just completed a tyvek prototype that is shown in the attached pictures. (do to a major snow storm I'm posting pictures taken with the shelter set up indoors)

    here is the AlpineMid entry side view:
    AlpineMid Entry Side

    Non vented end:
    AlpineMid End View

    Vented end:
    AlpineMid Vent End View

    The non entry side:
    AlpineMid Non Door Side

    The AlpineMid with door open:
    AlpineMid Door Open

    AlpineMid Door Open

    AlpineMid With Pad

    AlpineMid With Pad

    AlpineMid

    AlpineMid

    The exterior V'd pole sleeve:
    AlpineMid Pole Sleeve

    The measurements used were 96" long x 42" wide x 42" tall. Weight as shown with bonded seams was 18 oz, this can come down a lot with sewing and with smaller seam allowances.

    I hope to work with someone to fabricate a first run using silnylon with reinforced tieouts and pole sleeves. I plan to continue working with the tyvek on future prototypes (taller and longer) because I enjoy working with the material and I have yet to learn to sew.

    I will be interested to hear thoughts and comments from BPL members.

    Thanks to those who allowed me share the idea while I developed this first prototype.

    Thom

    #1464425
    peter kvamme
    Member

    @karacolor

    Locale: midwest

    Looks great Thom. Is the vent near the top held open with something, or just by the crease in the tyvek? How will the door stay closed/open?
    My personal opinion is that you should make the plunge and start sewing your prototypes now, better to start learning on prototypes than trying to figure it out last.

    I just re-read your post, and saw that you are going to work with someone in the sewing of your silnylon model… maybe you arent ever going to try doing the sewing yourself?

    Great project so far, thanks for sharing.

    #1464432
    t.darrah
    BPL Member

    @thomdarrah

    Locale: Southern Oregon

    Peter,
    With this being a prototype there are design elements that are not complete. The vent would have a stiffened brim and the door would use a zippered closure with double slidders on a production version.

    As a prototype there are fabrication methods used for simplicity. Notice the black ducttape reinforcement at the tieout locations.

    The prototype is built to verify that the working drawings are constructable and to identify design flaws. Notice that the end material does not underlap the peak vent enough, this will be corrected.

    I'm posting the project to help identify that the concept has merit.

    #1464442
    Steven Evans
    BPL Member

    @steve_evans

    Locale: Canada

    Thom,
    Having just received a DuoMid from Ron @ MLD, I am very interested and impressed with your prototype. I too have yet to learn how to sew so I feel your pain :)
    At 42" wide, that is plenty of space for 1, and since it is floorless, digging down is an option. There are a few guys on here sewing tarps, so maybe one of them could give this one a try in silnylon maybe?
    I like the V-config as it gives much more room inside. I also like the pole sleeves, but was just thinking…could you get away with just 2-3 loops along the side instead of an entire pole sleeve? It would save material (and weight), sewing, and seam sealing…Just thinking out loud, maybe you need it for stability.
    Great work, keep us posted.

    #1464450
    t.darrah
    BPL Member

    @thomdarrah

    Locale: Southern Oregon

    Steve,
    Thanks for the feed back. I wanted the full length pole sleeves to add strength for above tree line wind deflection of the long side panels. Maybe a half length sleeve would provide the same result.

    I would like to produce a run of five to ten using silnylon and if reviews are positive I would then want like to do a run using spinnaker and cuben, maybe five of each.

    The photos show the tyvek not as tight as I would like in some areas. This is largely the result of the shelter having simple tieouts (a hole puch used through duct tape and the doubled tyvek seam) that I could not really pull as tight as I would like. Also the tyvek, being brand new, was very stiff.

    #1464454
    John S.
    BPL Member

    @jshann

    What pole length are you using for those pics above?

    #1464455
    t.darrah
    BPL Member

    @thomdarrah

    Locale: Southern Oregon

    I used Leki adjustable poles set at 130. My fixed length Stix were to short.

    #1464475
    Steven Evans
    BPL Member

    @steve_evans

    Locale: Canada

    "full length pole sleeves to add strength"

    I suspected that was the case. We're probably talking grams at this point.

    I would think that a pattern like your tent wouldn't be too tough to sew (just my perception, I really don't know if it is or not). Would it be a long shot to go to your local fabric supplier and see if someone wants to make them? Or even a local tailor? That is of course if you don't find someone on here.

    #1464483
    t.darrah
    BPL Member

    @thomdarrah

    Locale: Southern Oregon

    My first preference would be to work with someone who has experience with both the materials and the application/use. Nothing about my design/concept is reinventing the wheel, tieouts, linelocs, peak vents and zippered access have all been applied with success on existing shelters. What is unique is the small solo size (for a Mid type floorless shelter), the V'd exterior poles and the pole sleeves.

    #1464503
    John S.
    BPL Member

    @jshann

    Well, the inverted V has been done before:
    1. Shannon's Golite hut 1 with internal inverted V poles
    2. Dondo's ID silshelter with outside inverted V poles
    3. Tarptent sublites with outside inverted V poles
    4. MLD duomid (special duo mode) with inside inverted V poles

    Still, your design is interesting though with the silnylon stretch it will be hard to keep things taut having exterior poles in a sleeve (with rain you have to go outside to adjust for a saggy shelter?).

    I'd like to see your shelter shape, but with the poles internal so you can adjust easily for sagging. You could stake down this shaped tarp, jump inside with your poles and put it up in seconds. Internal poles would also allow for fixed pole lengths, preferably from 120 cm up to 135 cm(what most would be using). The floor ends could either be pointed (sildiamond floor shaped ; )) with floor dimensions of abouts 9' x 5' or have the squared bottom like yours at 8' x 4'. If somebody don't make this shelter, I am..lol.

    #1464519
    t.darrah
    BPL Member

    @thomdarrah

    Locale: Southern Oregon

    Options are many.
    I like the exterior pole design for various reasons, either option has strengths and drawbacks. I would be willing to make design modifications to the shelter based upon input from who I work with for fabrication.

    I would opt to use silnylon for my first production run (when I can find someone to work with). Silnylon provides a good cost/performance/weight ratio. With positive feed back I would look at lighter and more expensive fabrics.

    #1464526
    Franco Darioli
    Spectator

    @franco

    Locale: Gauche, CU.

    Thom
    I too would suggest you re-think the full sleeve concept. As it is I cannot see how you could easily/quickly adjust the height of your poles to put the shelter back in tension once the silnylon has "relaxed" . For the same reason I would avoid fix length poles also.
    Franco
    Deleted some killjoy comments..

    #1464528
    Roger Caffin
    BPL Member

    @rcaffin

    Locale: Wollemi & Kosciusko NPs, Europe

    Very clean.

    Pole Sleeves: these make it rather rugged. Use above the tree line? Very possible. Add plenty of guy line tie-outs, and reinforce these on the **inside**. Allow a few stake loops at the middles of the bottom edges: they can be valuable in high wind.

    Seam allowances: don't make too small with silnylon version, and allow for a doubling over before the final seam. Silnylon is tough, but give it some support.

    Consider some guys on the corners rather low to the ground *as well* to help keep the bottom of the walls off your face and feet.

    Mosquito net across door-way? You could just let it hang with a good cross-over and a couple of snaps rather than a full zip. It could be a blessing in warmer weather, and yet weigh very little.

    Top ventilation: crucial!!! Cover the hole with no-see-um on the inside. Use whipper-snipper cord to stiffen the edge of the hood. Allow for lifting the bottom edge a bit for inwards ventilation – also essential.

    Cheers

    #1464530
    Brian Barnes
    BPL Member

    @brianjbarnes

    Locale: Midwest

    "I would like to produce a run of five to ten using silnylon and if reviews are positive I would then want like to do a run using spinnaker and cuben, maybe five of each."

    Thom – I'd be willing and interested in testing and reviewing a prototype of the shelter. In central and western Kansas we get some serious winds that would nicely simulate Alpine wind speeds. In my opinion this would be a nice "lower risk" testing ground…

    #1464532
    t.darrah
    BPL Member

    @thomdarrah

    Locale: Southern Oregon

    Franco,
    I'm well aware of the design limitations and will be interested to see actual performance of the shelter in varied conditions. A production version with linelocs located at all corners and the peak would allow for simple retensioning.

    I will be building two additional tyvek prototypes to provide to a couple BPL testers in exchange for user comments and pictures. I hope to have these ready to ship by mid January.

    With the hiking poles coming togeather above/higher then the peak the shelter can be retensioned simply via the tieout. Tester feedback and my own personal use may result in design modifications or changes.

    Thanks for the input.

    Brian, If you would be willing to test a tyvek prototype let me know. (I will not have silnylon versions untill I can find someone to produce the shelters for me.)

    #1464544
    Brian Barnes
    BPL Member

    @brianjbarnes

    Locale: Midwest

    "If you would be willing to test a tyvek prototype let me know."

    Thom – Testing the tyvek version would be just fine. Like I mentioned earlier I have driving distance access to some windy areas of the state. I plan to be out at least twice this winter here in Kansas. I will also be able to use the shelter on an early March, high elevation (11K+), cross country ski trip. On the later trip, there will be plenty of "4 season tents" in use by other team members that I could crawl into if needed. I'll PM you my e-mail address.

    #1464550
    t.darrah
    BPL Member

    @thomdarrah

    Locale: Southern Oregon

    Brian,
    Your on, we will talk over the details when I'm ready to ship. I will be shooting for 1/15/09 give or take.

    #1464555
    Roger Caffin
    BPL Member

    @rcaffin

    Locale: Wollemi & Kosciusko NPs, Europe

    Hi Thom

    > (I will not have silnylon versions untill I can find someone to produce the shelters for me.

    Sewing silnylon on straight seams is not that hard. Lots of pins and a fine thread and a low tension.

    Cheers

    #1464612
    Anonymous
    Inactive

    Thom,

    Have you thought about using type 14 rather than housewrap? Isnt 14 more water resistant than housewrap? …and lighter? and by the way, it is a beautiful piece of work!!

    #1464689
    t.darrah
    BPL Member

    @thomdarrah

    Locale: Southern Oregon

    John,
    If in the future I were to produce a tyvek version I would select type 14. The tyvek used (construction grade) worked well for fabricating the prototype. Its tough, bonds well and I have a good quantity on hand to work with. My goal is to produce a silnylon version first and proceed from there.

    #1465029
    Tim Marshall
    BPL Member

    @marshlaw303

    Locale: Minnesota

    has anyone offered to make you a sil version yet?

    -Tim

    #1465030
    t.darrah
    BPL Member

    @thomdarrah

    Locale: Southern Oregon

    Not yet. Please contact me via PM if interested.

    #1465038
    Don Meredith
    Spectator

    @donmeredith

    Locale: SouthEast

    I can vouch for Tim's workmanship. He made a very nice mesh shelter for me not too long ago. I was impressed with his flexibility and the quality of his work.

    #1465080
    Steven Evans
    BPL Member

    @steve_evans

    Locale: Canada

    I didn't want to mention Tim's name as I wouldn't want to put him on the spot, but he was the first person who came to mind when you were looking for a manufacturer. Judging by his creations for himself and others, it will be a quality piece of work. :)

    #1466723
    t.darrah
    BPL Member

    @thomdarrah

    Locale: Southern Oregon

    I'm commited to this project and things are moving full speed ahead.

    I have found an experienced sewer to work with and I have secured my slot in his upcoming schedule. I hope to have the initial shelter completed in January. This will be made using gray 1.35 silnylon with dyneema x reinforcements.

    I will follow up with a production run of multiple shelters in both silnylon and tyvek versions. One of each version will go out to a BPL member for testing. Depending on any design modifications wanted/needed after using the initial shelter being fabricated I hope to have the additional shelters made early in Febuary or March. This will largly depend on the sewing schedule.

    ipod design inspiration:
    Metallica "Death Magnetic"
    ACDC "Back In Black"

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