REFLECTOR: interference drag

[Scott Derrick]

Thats a good idea Larry,

I filled mine in with micro and it cracked..

Scott

Lawrence J. Epstein, MD wrote:
> My plan was to do something similar, but make the fairing an independent 
> piece, that could be removed. More importantly, I would leave a gap 
> ((3/16”?) on each mating surface and fill the gap with silicone. That 
> would allow for flex.
> 
>  
> 
> Larry Epstein
> 
>  
> 
> -----Original Message-----
> *From:* reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] 
> *On Behalf Of *RBrim
> *Sent:* Tuesday, November 20, 2007 5:05 PM
> *To:* 'Velocity Aircraft Owners and Builders list'
> *Subject:* Re: REFLECTOR: interference drag
> 
>  
> 
> Doug,
> 
> We proceeded down the same path on my plane, built in 1998.
> 
> I couldn’t tell that it picked up any speed, but it sure looks better. 
> 
> There is one problem, the 2 bid tends to be too thin and it cracks, 
> especially around where the nutplates are, there’s a little too much 
> vibration going on back there for 2 bid, so suggest you beef it up a little.
> 
>  
> 
> *Rodney Brim, *
> 
> CEO, Performance Solutions Technology, LLC
> 
> (707) 487-3000
> 
>  
> 
> *From:* reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] 
> *On Behalf Of *Douglas Holub
> *Sent:* Tuesday, November 20, 2007 1:43 PM
> *To:* Velocity Aircraft Owners and Builders list
> *Subject:* Re: REFLECTOR: interference drag
> 
>  
> 
> Thanks for the heads up. I'm not using it for strength, though, just for 
> a fairing. I glassed the strake to the fuselage normally, then poured 
> the foam and shaped the fillet, then put two plies of BID over the 
> shaped foam fillet.
> 
>  
> 
> Doug
> 
>     ----- Original Message -----
> 
>     *From:* Ken C. Baker <mailto:kenb at velocityaircraft.com>
> 
>     *To:* 'Velocity Aircraft Owners and Builders list'
>     <mailto:reflector at tvbf.org>
> 
>     *Sent:* Tuesday, November 20, 2007 2:25 PM
> 
>     *Subject:* Re: REFLECTOR: interference drag
> 
>      
> 
>     Doug,
> 
>      
> 
>     Looks good! A word of caution though - most of the pour foams
>     available on the market, even the very good ones, do //not// make
>     good structural cores. They have very low pcf ratings, and during
>     crystallization they form irregular cell structures. As well, they
>     are prone to soft spots. They're great for shaping things that you
>     will ultimately glass over - but it's important to remove the pour
>     foam, and replace it with a structural core like 3/8" divinycell,
>     then glass the other side. In other words, it's important to get
>     that sandwich structure back in there - especially at a critical
>     structural union like the strake/fuselage junction.
> 
>      
> 
>     Happy Building,
> 
>      
> 
>     -Ken Baker
> 
>     kenb at velocityaircraft.com <mailto:kenb at velocityaircraft.com>
> 
>     XL-RG Hybrid-5 in Progress
> 
>      
> 
>     ------------------------------------------------------------------------
> 
>     *From:* reflector-bounces at tvbf.org
>     [mailto:reflector-bounces at tvbf.org] *On Behalf Of *Douglas Holub
>     *Sent:* Tuesday, November 20, 2007 12:00 PM
>     *To:* reflector at tvbf.org
>     *Subject:* REFLECTOR: interference drag
> 
>     I used pour foam to fill in the intersection between the strake and
>     the fuselage, then shaped it with some 40 grit sand paper glued
>     around a Clorox bottle. Here's what the fillet looks like with a
>     Clorox bottle radius. By doing the top and bottom of the wings,
>     strakes, and winglet intersections this way, I'm hoping to pick up a
>     few extra mph.
> 
>      
> 
>     Doug Holub
> 
>     ------------------------------------------------------------------------
> 
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