REFLECTOR: Fixes for Stick Slop
Brian Michalk
michalk at awpi.com
Sun Jan 9 22:45:46 CST 2011
I have a Franklin with Ivo prop, so I already had a very sturdy mount
for the gauge. It's a dial gauge, pretty old, given to me by an old
timer. It reads to .0001 increments. A full needle revolution is .01
inches.
I measures the edge of the crank flange. I had to wait between
measurements, because there was a few thousandths movement just in the
bearing.
On 01/07/2011 05:15 PM, steve korney wrote:
> Brian...
>
> A New crank is lucky to measure .0005 TIR ... At what location on
> the crank did you measure that and with what kind of tools...?
>
>
> Steve
>
>
>
> ------------------------------------------------------------------------
> Date: Fri, 7 Jan 2011 16:53:58 -0600
> From: michalk at awpi.com
> To: reflector at tvbf.org
> Subject: Re: REFLECTOR: Fixes for Stick Slop
>
> Great questions.
>
> I installed the turbo, and ran the engine with wastegate wide open.
> The performance was 50RPM static better than a carbureted/magneto
> Franklin with identical propeller. I am very happy with the
> performance. First flight I calculated a 20 degree climbout angle. I
> was at 900 feet when the engine failed, about 2500 feet from where I
> took off. I don't know what that is in FPM, but I got there stinking
> fast. I kept pulling back on the stick to keep from overspeeding the
> engine. The plan was to increase prop once I reached 1000 feet.
>
> The initial configuration was a bit complex, so this second time I am
> removing complexity and will add back those features later.
> To control the wastegate and throttle, I built some linear stages,
> actuated via an embedded controller. This could be overriden by the
> pilot by using the friction lock on the knobs. These stages have been
> removed, and I'm waiting on a new set of throttle/turbo cables from AS&S.
>
> Since the primary fuel system is electronic injection, I fabricated
> from scratch a completely redundant injection system. It actually
> performed quite well, but tuning on the ground is difficult. I am
> removing the automated actuating part of it, and am instead installing
> a needle valve that is manually operated from the pilots position.
> The original backup EFI is nice, because in an emergency, it monitored
> for a power failure and engaged on that event, or a pushbutton.
>
> At this time, I am gated on several things. The cable install really
> needs to happen before I mount the intercoolers, which prevents
> induction or cowl work.
> Wings are ready to mount, but we are waiting on primer.
>
> I think three weeks after the parts are in that we'll be ready for an
> engine start. Optimistically, I'm saying March for another flight,
> but reasonably would me more like June/July.
>
> I checked the runout on the crank, and was very pleased to measure
> .0005" TIR. The manual says I'm allowed .008" so that's pretty good.
>
> On 1/7/2011 4:17 PM, Bob Jackson wrote:
>
> Sorry, Brian!
>
> I forgot about your first flight adventure. Don't feel bad,
> almost all of us have done something. I had engine problems
> (turned out to be my own engine control mis-management) and ran
> off the end of the runway when doing simulated power off
> landings. And my A/C partner collapsed the nose gear (poor
> technique and a suspect weld) and slid down the runway a 1000 feet
> grinding away the bottom of the nose!
>
> I'm sure your fix would do the job, I'm just concerned about the
> small-area steel-to-aluminum contact space. But probably for no
> reason.
>
> I remember you also had a pretty fancy turbo design. How is that
> working out? When do you think you might get back into the air?
> We fiddle-farted around for ten years to complete, then another
> half-year off repair the hole in the nose after the NG collapse.
> Nobody likes the 'when are you going to fly' question!
>
> Thanks for all you do operating and maintaining the Reflector,
>
> Bob
>
> ------------------------------------------------------------------------
>
> *From:*reflector-bounces at tvbf.org
> <mailto:reflector-bounces at tvbf.org>
> [mailto:reflector-bounces at tvbf.org] *On Behalf Of *Brian Michalk
> *Sent:* Friday, January 07, 2011 4:20 PM
> *To:* bobj at jaxtechllc.com <mailto:bobj at jaxtechllc.com>; Velocity
> Aircraft Owners and Builders list
> *Subject:* Re: REFLECTOR: Fixes for Stick Slop
>
> I think it's safe to say I have about .05 hours of airtime on it.
>
> That would be the first flight, and subsequent off field.
> However, over years of airplane work, it's been tight.
>
> On 1/7/2011 12:35 PM, Bob Jackson (Jax Tech) wrote:
>
> Nice design and approach! How many hours do you have on it?
>
> Don't you still have concerns about the effect on the softer
> aluminum of the hard steel bolt?
>
> ------------------------------------------------------------------------
>
> *From:*reflector-bounces at tvbf.org
> <mailto:reflector-bounces at tvbf.org>
> [mailto:reflector-bounces at tvbf.org] *On Behalf Of *Brian Michalk
> *Sent:* Friday, January 07, 2011 1:02 PM
> *To:* Velocity Aircraft Owners and Builders list
> *Subject:* Re: REFLECTOR: Fixes for Stick Slop
>
> There has been little discussion on a fix. My solution involves
> making a saddle, I'm not sure if it's what the factory does or not.
>
> I think the tubes are 1/2", so I bought some 1/2"ID, .25" wall
> aluminum tube.
> With about 2" of stock, I first machined a flat on opposing side,
> leaving about 1/8" thickness.
> Next, cut the tube in half along a plane parallel with the two flats.
> Take the two halves, and place them flat to flat, drilling a hole
> for the bolt. The tubes can now be cradled in the saddle.
>
> The flats help support the torque transmitted to the two tubes at
> right angles. For extra smoothness, use a thin teflon washer(or
> sheet) between the flats.
>
> On 1/7/2011 11:13 AM, Bob Jackson wrote:
>
> We've been flying for a couple of years and now have 300+ hours on
> the plane. When we started doing some formation flying recently I
> began to be aware that we're developing stick slop -- it's not
> what you want flying close formation, or when landing or anytime
> you need small corrections and fine attitude control.
>
> When we built the plane we were leery of the standard _steel_ AN3
> bolt that joins the bottom of the _aluminum_ stick stub and the
> aileron/elevator torque tubes) -- even when improved with the
> U-shaped steel reinforcing collar that the factory started shipping.
>
> In our case, we know that nearly all of our stick slop comes from
> this mechanical connection between the stick's torque tube and the
> aileron and elevator torque tubes. We've been on the Reflector
> for 12 years, but haven't heard much, if any talk about this
> problem and improvements that builders have made.
>
> The _question_ is: do any of you have good fixes for this
> connection that eliminates stick slop?
>
> Thanks,
>
> Bob Jackson
>
> N2XF
>
>
>
>
>
> _______________________________________________
>
> To change your email address, visithttp://www.tvbf.org/mailman/listinfo/reflector
>
>
>
> Visit the gallery!www.tvbf.org/gallery <http://www.tvbf.org/gallery>
>
> user:pw = tvbf:jamaicangoose
>
> Check new archives:www.tvbf.org/pipermail <http://www.tvbf.org/pipermail>
>
> Check old archives:http://www.tvbf.org/archives/velocity/maillist.html
>
> ------------------------------------------------------------------------
>
> No virus found in this message.
> Checked by AVG - www.avg.com <http://www.avg.com>
> Version: 10.0.1191 / Virus Database: 1435/3365 - Release Date:
> 01/07/11
>
>
>
>
>
> _______________________________________________
>
> To change your email address, visithttp://www.tvbf.org/mailman/listinfo/reflector
>
>
>
> Visit the gallery!www.tvbf.org/gallery <http://www.tvbf.org/gallery>
>
> user:pw = tvbf:jamaicangoose
>
> Check new archives:www.tvbf.org/pipermail <http://www.tvbf.org/pipermail>
>
> Check old archives:http://www.tvbf.org/archives/velocity/maillist.html
>
> ------------------------------------------------------------------------
>
> No virus found in this message.
> Checked by AVG - www.avg.com <http://www.avg.com>
> Version: 10.0.1191 / Virus Database: 1435/3365 - Release Date:
> 01/07/11
>
>
> _______________________________________________
> To change your email address, visithttp://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery!www.tvbf.org/gallery <http://www.tvbf.org/gallery>
> user:pw = tvbf:jamaicangoose
> Check new archives:www.tvbf.org/pipermail <http://www.tvbf.org/pipermail>
> Check old archives:http://www.tvbf.org/archives/velocity/maillist.html
>
>
>
> _______________________________________________ To change your email
> address, visit http://www.tvbf.org/mailman/listinfo/reflector Visit
> the gallery! www.tvbf.org/gallery user:pw = tvbf:jamaicangoose Check
> new archives: www.tvbf.org/pipermail Check old archives:
> http://www.tvbf.org/archives/velocity/maillist.html
>
>
> _______________________________________________
> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery! www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.tvbf.org/mailman/private/reflector/attachments/20110109/e4f7a4d0/attachment-0001.htm>
More information about the Reflector
mailing list