To Doug Brunner and others on the LML

 

Regarding my canopy lift spring idea, I think it’s going to be OK with the pneumatic canopy seal since that seal is attached to the side of the fuselage, not the canopy,  and inflates mainly outward (in the aft area near where the spring is located).  The spring is attached to the canopy and with the canopy closed, the spring is squashed flat and does not overlap the seal.  But like I said earlier, I haven’t installed the seal kit yet, so I don’t really know. 

 

Regarding noise in the cockpit during flight without the canopy seal…..yes, it is very loud!!!.   However, I think most of the noise is caused by engine noise, exhaust noise, and other vibrations being conducted by the rigid carbon fiber airframe.  I have no interior panels.  I do not hear much “air” noise.  (I have installed temporary foam rubber strips in place of the pneumatic canopy seal so some sealing is taking place.)  I hope the pneumatic canopy seal helps, because this airplane is very loud.  I even decided to buy “Mutt Muffs” for my dog.  And for humans, I think noise canceling headsets are a must. 

 

Regards

John Richardson

 

 

----- Original Message -----

From: John Richardson

To: lml@lancaironline.net

Sent: Wednesday, March 19, 2008 1:55 PM

Subject: [LML] Re: Lifting the Legacy Canopy

 

Here's another approach to lifting the Legacy canopy.  There is no external handle.  Instead, leaf springs are mounted inside the edge of the canopy on either side near the lateral guide blocks (see first picture).  When the canopy is lowered, the leaf springs contact the fuselage keeping the canopy up about .75 inch (picture 2).  The dimensions and strength of the leaf springs are such that when the canopy is lowered, the canopy latch can just engage.  When you lock the canopy down, the springs collapse (picture 3).  When you open the canopy latch, spring pressure pops the canopy up about .75 inch (picture 4). 

 

I have not installed the pneumatic canopy seal yet so there could be some interference. I've been flying with this spring arrangement for about 2 months now and it seems to work well.  I'd appreciate any feedback the group may have on possible improvements or obvious drawbacks. 

 

Regards

John Richardson

Spokane WA

N16DX

 

 

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From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Bill Bradburry
Sent: Friday, March 14, 2008 7:49 PM
To: lml@lancaironline.net
Subject: [LML] Lifting the Legacy Canopy

 

 Does anyone have any suggestions as to how to install a handle or otherwise to facilitate the raising of the Legacy canopy?  It is very difficult to get it to come up the first inch or so because there is no place to get a hold on it.

 

Pictures would be nice!

 

Bill B

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