Hatch latches and canopy mounting

[Grow Pattern]

The question about canopy fastenings really depends upon how many times you 
need to take the canopy off.  If you need to fasten wings or fit 
battery-packs then the retainers have to handle high usage. If it is a 
'once-in-a-while requirement I go for 4-40's and-blind nuts. The 4-40's are 
"locked" using the black tubing normally used for gas engines.

For frequent removing , the latch needs to exert light pressure on the 
contact faces to avoid wear and rattle. I suspect that Jason needs to put 
batteries in his plane quite often. The glider guys have many solutions to 
this problem but the best I have seen on a pattern plane is that described 
by Deano and used by George Asteris.

Regards,

Eric.


----- Original Message ----- 
From: "Jim Ivey" <jivey61 at bellsouth.net>
To: <discussion at nsrca.org>
Sent: Thursday, December 02, 2004 11:06 PM
Subject: Re: Hatch latches and canopy mounting


> Guys
> To keep down canopy rattle due to vibration,etc, just rub a thin layer of 
> silicon rubber around the mating inside edges of the canopy. Use clear 
> RTV.This cuts down the looseness and noise from the canopy.
> Where credit due, tip came from Tony Stillman.
>
> Jim Ivey
>>
>> From: Bob Kane <getterflash at yahoo.com>
>> Date: 2004/12/02 Thu PM 10:37:46 EST
>> To: discussion at nsrca.org
>> Subject: Hatch latches and canopy mounting
>>
>> My El Nino has completed it's third season. The canopy
>> is held in with 2 dowels in the front and a 4-40 screw
>> in the back. Originally the front dowels were carbon
>> rods into glass/balsa, and they wore rather quickly. I
>> replaced the carbon tubes with a birch dowel, opend up
>> the holes and glued some 6-32 WellNuts (cut down to
>> roughly 1/4" in length) into the hole. The rubber
>> WellNuts eliminated wear and help dampen noise. The
>> chin cowl on this plane is held in place with 4-40
>> steel pins in the front and Hatch Latches in the rear,
>> both going into plywood. I find both the front holes
>> and the holes for the hatch latches wear due to
>> vibration.
>>
>> I have been so impressed with the wear-free
>> performance of the dowels in the WellNuts, I am
>> mounting both the chin cowl and canopy of my new
>> Temptation using this method. The next K-Factor will
>> have some pictures of the chin cowl mounting system,
>> the one after that will have pictures of the canopy
>> mount.
>>
>> If you are not familiar with WellNuts, they are kind
>> of a rubber version of an expanding drywall fastener.
>> I remove the part with the machine nut molded in to
>> save some weight since it is not used.
>>
>> =====
>> Bob Kane
>> getterflash at yahoo.com
>>
>>
>>
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