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Pinecone

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Posts posted by Pinecone

  1. You have to look at the axis of the steering pivot.  And extend that line to past the axle.

    It would be just about impossible to ride a bike with negative caster

    "Again, the angle this line makes with the vertical is the caster angle. The first purpose of the caster angle is to give stability to the steering wheels, which would otherwise be unmanageable."

    "In the context of bicycles and motorcycles, caster is more commonly referred to as "head angle", "rake angle" or "rake and trail", especially in American English. The terms caster or castor angle are still predominantly used in British English."

  2. 11 hours ago, EricJ said:

    Too much caster just makes it hard to steer, but you have to have some caster or the steering will be unstable and try to deflect uncommanded.    PA-46 have very, very little caster and it can get out of rig fairly easily, which is why a common accident for them is suddenly running off the runway.

    Cars have caster, which is why the steering will center if you let go of the steering wheel.  

    Mooneys don't have a ton of caster, but enough if the nosewheel caster stays in rig.   When it starts to go out of rig due to bushing wear, etc., the eight-second ride starts to happen when there is insufficient caster.   The diagrams and procedure in the SB are specifically to make sure there's enough caster for the nosewheel to try to self-align rather than be unstable or deflect.

    In race cars most folks I knew (myself included) went for maximum caster in front end alignments.    This increases steering effort a bit, but also helps turn-in and speeds up auto-centering which can be crucial in spin or slide recovery, especially if the steering rate is fairly slow.

    This is all true for motorcycles as well; the steering will be unstable if there isn't at least a little caster.

     

    EXACTLY.

    Also, on race cars the caster causes camber gain on the outside front tire, reducing understeer.

    My M3 setup, when I was going a lot track work, made people think something was broken if I parked with the wheels turned.  3.5 degree static camber and a lot of caster will do that. :D

  3. 19 hours ago, Shadrach said:

    This is a full service forum.:D  Seriously though, imagine trying to steer a motorcycle with the front end configured like a shopping cart...fork out in front with a trailing link and the axel well behind the pivot. 

    Actually if you look at the pivot axis on a motorcycle and extend it to the axle, the axis line IS in front of the axel.

  4. On 3/21/2024 at 4:46 PM, Fly Boomer said:

    I'm reading the manual excerpt you posted above but, starting with a go-kart I built when I was 10, I have always found that more caster makes a vehicle want to go in a straight line, and less caster makes it want to do anything but.  I don't get why the axle centerline must be moved back (less caster) to prevent bad behavior on the ground.

    Axle moving back increases caster.   Look at shopping cart front wheel.  Axle is well behind the pivot axis.

  5. On 3/23/2024 at 3:41 PM, LANCECASPER said:

    Plus he is implying that polysulfide is being used to seal the tanks, when in reality it's what Weep No More and Wet-Wingologists use to remove sealant. https://www.rpm-technology.com/wp-content/uploads/2016/12/PolyGone-310-AG-Inst-v2.pdf

    Other than all of that misinformation, i agree that prep being paramount is true on this and any other tedious job.

    You need re-read that link you posted.

    The product is PolyGone and used to REMOVE ploy sulfide sealant.

    Polysulfide IS the sealant used.

    • Like 1
  6. 8 hours ago, Hank said:

    P.S.--I wouldn't lift by the engine mount! That outs force.90° to the bolts, and they aren't designed for that. Having a couple of overstretched engine mount bolts break in flight could be unrecoverable!

    Bolts are supposed be loading in shear when possible.  That is, 90 degrees to the length of the bolt.

    With lifting by the mount, I would be more worried about bending a mount tube.  So I would make sure the strap is at a cluster of tubes.

  7. 23 hours ago, Becca said:

    lol, I love my undeserved reputation for power here :).  If only the reality matched!

    In all seriousness, we advise many people not to get a pre buy from a mechanic on field with the airplane or a mechanic that regularly maintains the plane…. It seems reasonable to practice what you preach.  Also, there’s just a built in conflict here - is the mechanic supposed to betray a long time customer and blow up a deal by finding something bad they really should have found before? And what if the mechanic missed something then just keeps missing it on the pre buy?

    Everyone is just more comfortable with the sale if there’s an independent assessment.

    It’s crazy that even MSC’s won’t respond to a call about a pre buy - I know there’s some MSC shops regularly on MooneySpace, I wonder if they’d chime in about what’s going on? Seems like Mooney pre buys would be a required service for them to provide. Unfortunately, Mooney is not currently authorizing new MSC’s afaik.

    I don't think it is undeserved.  And I understand where you are coming from.  

    And I agree with who to use for a pre-buy, in general. But there are some mechanics that I would trust, even if they had a relationship with the plane and owner.  But those are ones who do a real annual and do not skimp.  So, in those cases, their word would be enough for me without a "formal pre-buy."

     

    • Like 1
  8. Since it was experimental, it was probably legal.

    Years ago there was a big gypsy moth spraying operation.  One group staged out of my home field.  They had two Ayrs Turbo Thrush aircraft.  They were Restricted airworthiness.

    The fuel placards said USE ONLY - Jet-A, Jet-A1, Jet-B, Jet-B1, JP-4, JP-5, Diesel Fuel - Kerosine, Home Heating Oil, AVGAS 80/97, AVGAS 91/96, AVGAS 100LL, AVGAS 100/130, AVGAS 115/145, MOGAS 

    I loved the ONLY

    The text wrapped around the filler several times.  I was surprised that they did not list Moonshine. :D
     

    • Haha 2
  9. 9 hours ago, JayMatt said:

    First class or the cheapest ticket you can find? And how would they back that up or accuse you of wrong doing? Maybe take a snap shot of the flight cost when you take your own plane? 

    I was talking to my CPA about using my plane to pick up some product for our business. She was saying I could even claim depreciating value on my plane now. I am also very curious how the mileage works. 

    You do a cost construct.  It is a form where you list the costs of the "normally way of traveling" and what you are doing.  They will only pay the lower of the two numbers.

    This would include if you wanted to drive a very long distance that was not for a relocation.

    The reimbursement rates are what the General Services Administration sets as the full cost of that means of travel.  So the $1.76 includes fuel, oil, insurance, maintenance, wear and tear, and depreciation.

    The air fare is based on economy for domestic travel.  There are provisions for business class for long flights, but not all agencies or even all parts of some agencies will send you business class.  Although, if the trip meets the requirements to be business class, if you are flying economy, you get a 24 hour rest stop along the way.  So you get overnights in London, Paris, Frankfurt, Amsterdam, Tokyo, Seoul, Singapore and other horrible places. :D

    On top of that, there are contract fares, which are negotiated for the entire year.  And those are the fare basis for cost constuct.

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