Sentinel upscale 2019

Discussion in 'Scratch Built' started by Event Horizon, May 22, 2019.

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  1. Aug 12, 2019 #91

    neil_w

    neil_w

    neil_w

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    I only ask because I've used the Krylon UV-resistant clear a few times on top of Rusto 2x with no issues at all, and I didn't know what the heck I was doing. I do strongly recommend the UV-resistant clears if you have the choice, since they'll prevent yellowing.
     
  2. Aug 13, 2019 #92

    Event Horizon

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    Here's the part number and description and a photo.

    krylon.jpg 3403 Gloss Crystal Clear
     
  3. Jan 11, 2020 #93

    Gramparocket

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    That's a nice build. Just me but I would put in a bigger MMT if i built one that size. I have an Optima clone with a 29mm MMT.
    I built my upscale Sentinel HPR. 3" 38mm MMT 65" dual deployment.
     

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  4. Jan 11, 2020 #94

    Gramparocket

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    HPR Sentinal
     

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  5. Jan 13, 2020 #95

    Event Horizon

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    Gramparocket, Thanks for the kind words. Where were you when I asked the questions about motors way back at the beginning?? LOL. Just kidding.

    Being a green horn in this size rocket I asked and really didn't get an answer that convinced me differently until it was too late and the MMT and tail fins were installed.

    I've come to the conclusion that this rocket isn't going to fly because of the MMT. I have all the parts needed to build another 2.6" Sentinel with a 29mm MMT. I just gotta get going on it.
    Got side tracked doing some stick and tissue aircraft and some RC stuff.

    That's an awesome looking one your building.
     
    Last edited: Jan 13, 2020
  6. Jan 13, 2020 #96

    Event Horizon

    Event Horizon

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    Almost forgot to ask, where did you find a 3" diameter nose cone with the correct ogive shape, IIRC it is 5.1
     
  7. Jan 14, 2020 #97

    Gramparocket

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    I was out flying rockets lol. That's a PML nosecone i think it's a 4:1 i wasn't too concerned with an exact match its just a fun scale clone.
    What kind of tubing did you get for your 2.6? Heavy wall our thin?
     
  8. Jan 14, 2020 #98

    Event Horizon

    Event Horizon

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    I bought 2.6" body tubes from Erockets (thick wall),
    and Rocketarium (thin wall)
    The thicknesses are in a post on this thread on page one
     
  9. Jan 14, 2020 #99

    Event Horizon

    Event Horizon

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    The first Sentinel upscale was built using the thinner tubes. I know thick wall tubes are heavier but I don't suggest building thin wall airframes, everything is just a bit more difficult.

    The second Sentinel upscale will use the thick wall tubes from Erockets. I have all the parts, except I haven't figured out exactly the best way to make a parachute cord and I just need a bit of motivation.
     
    Last edited: Jan 14, 2020
  10. Jan 15, 2020 #100

    Gramparocket

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    You can use KEVLAR cord and epoxy it right to the motor mount. 10- 15 ft is good for mid power. Cords are rated at different strenght from each supplier but any 1/4"cord should due. tie the other end off to the nose cone, put a loop in the cord about 1/3 of the way down and attatch the parachute to that. It should fly well on f-g motors
     
  11. Jan 15, 2020 #101

    Gramparocket

    Gramparocket

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    oh and notch out the top c-ring to fit the cord trough
     
  12. Jan 16, 2020 #102

    Event Horizon

    Event Horizon

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    Thanks for the advice Grampa. I'll look into that
     

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