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Date: Thu, 29 Jan 2009 23:23:54 -0500
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From: Tom McNerney <dudewanarace@yahoo.com>
Subject: Down Flap Relay Failure (Update)
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In response to Scott Krueger I have come up with a few answers to his well =
thought out questions.=A0 If I could only be as=A0articulate as he is. (My =
Holiday Inn Express stay is way over due)=0A=0A** It would be nice to know =
why the relay got stuck (contacts fused?) so that the cause can be eliminat=
ed.=0A=0AIt seems that one of the contacts has some sort of buildup on it.=
=A0=A0This buildup was half way across the intended gap of the contacts.=A0=
 I can only assume this was from the relay arcing.=A0=0A=0A** Did you later=
 measure the actual flap angle since it was probably larger than 45 degrees=
 if the motor reached its mechanical limit?=A0 Such a deployment could expl=
ain the lesser effect of the elevator.=A0 =0A=0AYes, sort of.=A0 The book c=
alls for 8 or 8.5 inches travel (can't remember)=A0measured from the inner =
most point of the flap.=A0 My flaps were at 11 inches.=A0 Not sure what ang=
le that is yet.=A0 Pics below:=0Ahttp://www.n54sg.com/stuff/flap01.jpg=0Aht=
tp://www.n54sg.com/stuff/flap02.jpg=0A=0A** Were the flap to bell crank pus=
h rods=A0bent as the hole thru the rear spar might not have been big enough=
 to handle such an extreme?=0A=0ANo=A0 That does seem to be the limiting po=
int of the travel, but the breaker popped before any damage was done.=A0 In=
 flight I was very concerned about flap limit speed.=A0 VFE (Maximum Flap E=
xtended Speed) is 120 MPH, assuming you only have 45 degrees of flaps exten=
ded.=A0=A0One can only assume that more flaps equals a lower VFE.=A0 Had I =
firewalled the throttle I think I would have found out what the true VFE is=
 for that amount of flaps.=A0 I do know they held up to about 100 MPH indic=
ated.=A0 Any slower and I lost pitch up.=A0 I was to chicken to go any fast=
er.=A0 This was the main reason I DID NOT want to go around.=0A=0A** Do you=
 trim the elevator with a tab or spring load the whole elevator?=A0 If by t=
ab, it might not be as effective at slower speeds.=0A=0ATab, but a bit bigg=
er than stock tab I think.=A0 Pics below:=0Ahttp://www.n54sg.com/stuff/trim=
tab01.jpg=0Ahttp://www.n54sg.com/stuff/trimtab02.jpg=0A=0A** What do you es=
timate as=A0the location of the CG (I assume you still have that heavier en=
gine up front)?=A0 It might be too far forward when low on fuel.=A0=0A=0AI =
have no idea...=A0 And this worries me.=A0 I was told this engine was +35lb=
s.=A0 But I have also switched from the composite intake to the aluminum, a=
dding a few lbs.=A0=A0 I am on the hunt for some scales and someone that kn=
ows how to use them.=A0 At least get some idea of where the CG is.=A0 The l=
og books showing the engine install does not have that information.=0A=0ATo=
m McNerney=0Awww.N54SG.com