Whats the deal with flap gap seals?

Discussion in 'Flight Following' started by BonanzaDriver, Jun 12, 2007.

  1. BonanzaDriver

    BonanzaDriver Pre-Flight

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    Just wondering if anyone has first hand, before and after, experiences with flap gap seals.

    If I can gain 6-8knots for 500$, I am all over it.

    Also, there was a company called Smith Speed Conversions that I keep hearing about from fellow bonanza owners/old timers. The claim is that this company produced mods that gave the bonanzas 25 knot cruise speed increase due to the reduced parasitic drag. (I am skeptical) I have searched and searched and cannot find anything.
     
  2. Ken Ibold

    Ken Ibold Final Approach

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    Don't know about a Bo, but in a Piper Lance flap gap seals primarily improve low-speed handling. They do give a negligible (2-3-knot) cruise speed increase, but the low speed handling is the biggest gain, followed by a slighly improved rate of climb.
     
  3. EdFred

    EdFred Touchdown! Greaser!

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    I didn't notice much top end from the gap seals, but I can fly below the bottom of the white arc with no flaps in my Cherokee.
     
  4. AdamZ

    AdamZ Administrator Management Council Member

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    Thats quite a claim! I'd be skeptical too.
     
  5. Steve

    Steve En-Route

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    Last edited: Jun 12, 2007
  6. Dr. Bill

    Dr. Bill Pre-takeoff checklist

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    Steve, you sure remember a lot of minutiae!

    Impressive!
     
  7. Dr. Bill

    Dr. Bill Pre-takeoff checklist

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    BTW, I was told by previous owner that my Cessna 150L cruised at 112mph before the complete STOL kit (including flap gap seals); And it now cruises at 117mph. (And will slow fly near 35!)
     
  8. ScottM

    ScottM Taxi to Parking

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    I have them on my Cherokee. The previous owner put them in. 2-3kts improvement in airspeed. That along with my wheel pants, 5 kts improvement in AS, my wing root flap seals also 2 kts improvement in AS, and I cruise at 130kts!!

    Of course not I still cruise at about 115 to 120kts. I see a bigger change in AS with loading and with waxing. I am sure those things help but they do not add up on top of each other.
     
  9. Steve

    Steve En-Route

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    Well, I just happened have the chance to park the first PropJet prototype (Piper Malibu conversion) at Sun n Fun when it was staging to do its fly-by demo back in the 80's. Talked to the pilot for a bit. First plane I ever got to back into its spot under its own power! :)

    The rest was Googled ;)

    A prior Soloy conversion used an Allison 450hp turbine before PropJet got in the business.

     
  10. tonycondon

    tonycondon Gastons CRO (Chief Dinner Reservation Officer)

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    gap seals are standard and have been for a long time in sailplanes. enterprising individuals have been known to use venetian blinds to cover the gaps in ailerons,flaps, elevators, rudders.
     
  11. wsuffa

    wsuffa Touchdown! Greaser!

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    Not a chance. A knot or two, at best.

    I put them on the Commander a year before I put on the vortex generators. They help with the low end a bit, and add maybe a knot or two at the top. The VGs did much more for the low end handling than the gap seals.
     
  12. N7702Y

    N7702Y Pre-Flight

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    My Twinkie has them, part of the Robertson conversion. As Ken noted, they seem to do more for low speed handling than speed.

    Jay