Cessna 170B 1953.
I see small holes in the leading edge of the horizontal stab, I think there is 4 of them.
What are those small holes made for?
If installing an abrasion boot , they will all be covered.
Small holes on the leading edge of horizontal
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Re: Small holes on the leading edge of horizontal
I don't know for certain but my best guess is that they are holes used for alignment pins in the factory's jigs when the parts are formed.
Gary
Re: Small holes on the leading edge of horizontal
Yep, that’s what I’ve always been told. Former Historian (and aircraft engineering consultant) also said this was their purpose.n2582d wrote:I don't know for certain but my best guess is that they are holes used for alignment pins in the factory's jigs when the parts are formed.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
- cessna170bdriver
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Re: Small holes on the leading edge of horizontal
Hmmm… I have always ASSuMEd they were vent holes to reduce condensation inside the surface, but the tooling hole idea makes a LOT more sense.
Miles
“I envy no man that knows more than myself, but pity them that know less.”
— Thomas Browne
“I envy no man that knows more than myself, but pity them that know less.”
— Thomas Browne
Re: Small holes on the leading edge of horizontal
I thought some were used to mount longwire antennas.
John
John
John Hess
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Past President 2018-2021
President 2016-2018, TIC170A
Vice President 2014-2016, TIC170A
Director 2005-2014, TIC170A
N3833V Flying for Fun
'67 XLH 900 Harley Sportster
EAA Chapter 390 Pres since 2006
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- ghostflyer
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Re: Small holes on the leading edge of horizontal
I agree with Miles, I was told to keep them clear of dirt and bugs.
Re: Small holes on the leading edge of horizontal
No, ... long wire antennas connected to a ceramic-tower on top of the boot-cowl in front of the windshield, travelled up to the linen/resin post above the windshield, then went aft and passed-through a fitting on top of the rudder and trailed-behind.n3833v wrote:I thought some were used to mount longwire antennas.
John
HOwever, an ADF “sense” antenna was attached to a “key-slot” cut in the leading edge of the vertical stabilizer.
The small holes were not drain holes or anything other than spigots for assembly-line alignment jigs. (Again, per Cleo and I believe I’ve heard Del Lehman say the same.)
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.