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Airbox Options for Raven Cold Air Intake with RSA-10 Servo

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  • Airbox Options for Raven Cold Air Intake with RSA-10 Servo

    I’m trying to sort out how to package a Raven Aircraft cold air intake with one of the larger, older RSA-10 style fuel servos inside a cowling, while also housing a filter, ideally providing a MAP boost, and incorporating some form of alternate air if feasible. The main challenge with this setup is that the front of the servo sits very far forward and the entire assembly hangs down quite a bit.

    After brainstorming with another builder, the leading idea at the moment is to modify a Vans RV inlet (similar to Nev’s approach), make an additional slight modification to the bottom of the nose bowl so the two fiberglass pieces mate more cleanly, build a custom airbox inside the chin of the scoop, and then connect that airbox to the fuel servo using an elbow or 4” SCEET.

    My reservations with this approach are the ~90° turn just ahead of the fuel servo, the lack of a defined filter solution, and the amount of custom fabrication it would require. Those skills aren't my strong suit, so I'm concerned about both the time required and the quality of the end result.

    If anyone has advice, ideas, inspiration, off the shelf pieces I should consider utilizing, or lessons learned from a similar setup, I’d really appreciate any direction you’re willing to share.

    Colby
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    Colby Osborn
    Mullen/Lincoln Nebraska
    Model 5 Quick Build Kit

  • #2
    Colby, I can add a couple of considerations now after 600 hours of operation. The Vans RV inlet works well. I've never removed it by itself, I just remove the whole cowl which is a quick exercise. Making it permanently attached would be a good solution. Fiberglassing certainly wasn't my strong point at that stage either but you learn as you go.

    Do you need an alternate air ? I'll throw this grenade from a safe distance then stand on the sidelines and watch the debate with interest :) Having an alternate air mitigates one risk (though on a VFR machine it can arguably be a relatively low risk), but it can introduce another. There are several cases on the Vans forums where parts of the alternate air mechanism have broken, been ingested, and caused an engine failure. Just a consideration.
    Nev Bailey
    Christchurch, NZ

    BearhawkBlog.com - Safety & Maintenance Notes
    YouTube - Build and flying channel
    Builders Log - We build planes

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    • #3
      I have a Raven Cold Air Intake also for mine but haven't started working on that part of the plane. Watching to see what you come up with.
      Travis M
      Kentucky
      Bearhawk 5 Quickbuilt Kit Plane #5041
      Received December 2022
      Builders Log

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