Rouse-Tech Fin Cans - 6" body tube?

Discussion in 'High Power Rocketry (HPR)' started by ckamila, Jan 20, 2016.

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  1. Jan 20, 2016 #1

    ckamila

    ckamila

    ckamila

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    Anyone know if Rouse-Tech is still making their external fin cans and if so what body tube size. I am looking into a 6" project and considering using them.

    Also, if you have them installed, what are your thoughts?

    http://www.rouse-tech.com/fincans.htm


    thanks,

    chris
     
  2. Jan 20, 2016 #2

    dixontj93060

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  3. Jan 20, 2016 #3

    ckamila

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    I contacted Mike Fisher first. His start at $500 for the 3 fin 6" units plus a fee for the extra fins. His stuff is great but looking at price too.

    Rouse-Tech shows the 3 fin model at $204 and the 4 fin at $229, $25 for extra fins. Tube size is not listed.

    Chris
     
  4. Jan 20, 2016 #4

    dixontj93060

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    AFAIK Rouse-Tech is OOB.
     
  5. Jan 20, 2016 #5

    ChrisAttebery

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    I'm pretty sure they were for 4" tubing.
     
  6. Jan 20, 2016 #6

    Worsaer

    Worsaer

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    Rouse tech were indeed for 4" airframes, same for Hawk Mountain. Binder's are currently the best available.
     
  7. Jan 20, 2016 #7

    COrocket

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    Considering the current binder design 4" stuff is $199 he actually undercuts the rousetech stuff considering those prices are several years old. Honestly $500 seems fair given you are asking him to do a custom product that requires a lot of setup time for a one time item. That's probably where a lot of the cost is. Anyways to my knowledge you are going to have to go custom for what you are looking for.
     
  8. Jan 20, 2016 #8

    ckamila

    ckamila

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    Originally thought the Rouse stuff was for 6" not 4", so if i could save several hundred dollars, great. Mike's stuff is top notch and i understand this is not a production item.

    This is my L3 project with ARLISS as the goal - i provide the bird and the students provide the motors http://www.arliss.org/. From what i understand, given the weight and repetitive flights, the fins can take a beating and so replaceable fins are frequently used.

    thanks,

    chris
     
  9. Jan 20, 2016 #9

    Titan II

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    L3 certification? If so, Tripoli and NAR do not allow prefabricated fin cans.
     
    Last edited: Jan 20, 2016
  10. Jan 20, 2016 #10

    ckamila

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  11. Jan 21, 2016 #11

    cherokeej

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    I fly ARLISS.

    Most of our 6" M birds use sheet metal fins, with an internal can. The can is a pre-fab item. The can goes inside the HM 6" glass a/f tube, with the fins screwed to the outside. (It is not a "fincan" like the Acme cans.) Don't know if there are any left to be purchased. They were originally made by Tom Rouse, of Rouse-Tech. Just a thin-walled aluminum can, pre-drilled and tapped for the screws to hold 4 sheet metal fins. A second "batch" was made thru Chris of Erwin Automation, now in Carson City, that were rolled sheet aluminum, with Pem-nuts installed. (Not 100% on this, but I'm pretty sure Chris contracted those to a friend in sheet metal work.) The cans also have a hole for a rail guide.

    These birds are assembled using #8-32 button head socket head cap screws. You will find very little epoxy in an ARLISS-M. This makes for easy fin replacement, and easy rebuild, should that be necessary. Fly a lot of ARLISS, and you will bend fins.

    Can't speak to TRA rules, but it's absolutely "legal" for a NAR L3 cert. (I'm a former L3CC. Gave it up due to health.)

    I haven't talked with Becky in a while, are there more fins available? There was talk of contracting a big batch of fins @ $20 a copy. (I know some folks have spares, but I don't think they'll want to sell them.)

    If you can get the fins, making a booster shouldn't be a problem. I know where I can _borrow_ an internal can. (I'm sure that can will not be for sale.) I position the internal can in the booster tube, and use a 90° off-set pneumatic drill to drill the first hole, from the inside. Remove the can, drill out the hole for #8 clearance. Reinstall the can, install that first screw to hold things tight, and drill the rest of the holes. Remove the metal can, replace it with a fiberglass coupler, position it and drill it for #8 clearance for all the holes. Then install T-nuts inside the coupler with some J-B Weld. (Not-so) Instant internal fin can. Then you can finish building the bird.

    The upper section is crucial. You'll need a tether and charge well above the av bay, then in goes the carrier, then a spacer plate as a lid on the carrier, then the nosecone gets shear pinned in place. There must be NO gaps. The n/c bulkhead is recessed, to make room for the n/c chute and the tether that attaches to the carrier lid. Mains are below the av bay.

    ARLISS is a great program. But it's not for the inexperienced. You will need to demonstrate a proficiency for getting the laundry out. And you'll need to do a test flight for the ARLISS committee, demonstrating that you and your bird can not only get the laundry out, but deploy the payload, too.

    ARLISS started in 1999. Over the years, we have over 1000 flights, and in that time, we have lost only 3 student payloads to rocket failure.

    Because some of those student projects represent years of work, a grade, and possibly that student's future, that's 3 TOO MANY.

    If you want to get fancy, you can always contract to have aluminum centering rings made. Like I said, these things are assembled using screws.

    View attachment 280332 View attachment 280333
     
    Last edited: Jan 21, 2016
  12. Jan 21, 2016 #12

    JimJarvis50

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  13. Jan 21, 2016 #13

    watermelonman

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    For ARLISS, Becky and I have been talking a good deal about moving from the traditional bird to the Rocketry Warehouse Formula 150 design by William Walby, which I think is basically a stock Formula 150 with a 98mm mount and then the usual deployment modifications.

    Of course if you built to the old design it would still work, but this seems to be our direction moving forward. It would be a great idea to be directly in touch with ARLISS leadership, since most flights are from the same known group.
     
  14. Jan 22, 2016 #14

    cherokeej

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    Over the course of some 52 flights, I replaced fins on the Pencil Arliss at least 3 times out on the playa. One year, Dave and I had to stomp one fin out as flat as we could make it. It still had a tiny touch of a whoopsie to it, but it flew fine until it could be replaced. IIRC, we've replaced fins on the Popsicle, too. One year, Jonathan went thru three sets in one week. Poor guy. Murphy was all over him that year.

    That happens when they swing under chute. And you know they want us to fly in the breeze.

    Do you really want to go with epoxied-in fins? Hit hard once, and you're done for the week.
     
    Last edited: Jan 22, 2016
  15. Jan 22, 2016 #15

    watermelonman

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    I see the benefits and agree, but if we are having problems obtaining the parts then the benefits are negated. I have no real preference, I simply want to see it settled before I start my build!

    In any case prospective ARLISS participants should definitely be in touch with Becky.
     
  16. Jan 22, 2016 #16

    cherokeej

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    I do agree anyone interested in flying ARLISS should contact Becky at AeroPac. Coordinator Extraordinaire!

    As I recall, Tom's issue with having more cans made was the cash outlay. Minimum order times cash for each is a serious load of dough. Same for the fins.

    ARLISS needs a sponsor. A sponsor flush with cash to toss around. Short of that, we need to find a way.

    The cans... We can get by without the cans. Keep one on the side as a pattern, and I can make the cans out of couplers and some T nuts. I have the tools for that. And for ARLISS, I'll work cheap.

    But we're gonna need fins. Lots of fins.

    If we start building ARLISS in a conventional manner, one breezy week could wipe us out. If we bust up half the fleet on a windy Wednesday, we're gonna be in a world of hurt come Thursday morning.

    I'm sorry, Eric. I don't know what to say. I don't like this.
     
  17. Jan 24, 2016 #17

    ckamila

    ckamila

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    choerokeej - do you happen to have any pictures of these fin cans so i can get a better idea of construction?

    Good to know about the NAR acceptability.

    thanks,

    chris
     
  18. Mar 29, 2016 #18

    ckamila

    ckamila

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    watermelonman and/or cherokeej - Do either of you have contact info for Beck at AeroPac? I do not see a listing for her on their site. I did email Ken Biba but have not heard back as of yet.

    Anyone have info on old style ARLISS fins and/or fin cans? There are a set of fins for sale but with no replacements i would be in the same boat as epoxied fins, no?

    Thanks,
    Chris
     
  19. Jun 18, 2018 #19

    rockethunter99

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    hi Chris .... this may to be a bit late but i do have a set of Rouse-Tech 4 inch fins (4 fins & 4 rings ) and 3 extra fins for sale in Canada .... lloydlloyd1954@hotmail.com
     

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