REFLECTOR: Overhead NACA's (was "Rudder Pedal stops")

Richard D. Wallace, Jr. rdwallace57 at gmail.com
Wed Apr 15 11:53:43 CDT 2009


How far did you push the skin down?

On Wed, Apr 15, 2009 at 8:45 AM, Lawrence J. Epstein, MD
<ljepstein at hotmail.com> wrote:
> You guys are "fastbuild" compared to me (13 years and counting). Mine is so
> old that NACA's hadn't been invented yet (not really) ( we had to walk
> uphill to school, both ways, in the snow, no shoes………)
>
>
>
> Anyway…………..The factory sent me the templates and I cut them out myself (no
> opinion as to whether these are real NACA's or not). I cut everything except
> the forward most part and just pushed the skin down to the desired depth. I
> used 1/4" foam for the sides and covered them with bid. About 6-10 hours
> work.
>
>
>
> Larry Epstein
>
>
>
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
> Behalf Of jerry at jlbent.com
> Sent: Wednesday, April 15, 2009 8:22 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Rudder Pedal stops
>
>
>
> Just to add to the challenge on the NACA ducts, you might want to consider
> the efficency of the factory design.  While they look like NACA ducts, they
> are not.  Andy Millin has spent a lot of time researching the topic and has
> a spreadsheet that does the calculations to produce the needed profile.  One
> very big difference (and maybe the most important) is that the factory
> solution does not have an airfoil on top of the opening.  Of course the
> amount of work needed to create a real NACA vs buying the factory pre-fab is
> not trivial.
>
> I too am a SLOOOW builder and have a kit that did not come with the
> pre-fab'd NACA's.  Mine did not even have the NACAs drawn on the fuselage.
> I had read Andy's information and decided to build my own.  Just let me say
> that one can get really obsessive about the details.  I would say that Brett
> and I have at least 50 hours of work on them.  Some is my learning curve.
> Some is just ! the details.  We did the extra work to make the floor of the
> ramp flat, which is not what you get if you just cut the outline, build the
> side walls and call it done.
>
> As of yet, I can not say that the true NACA will be better.  Hangar 18
> suggest NACA's and believes they are better.  I do know that those in the
> Vari community think the Velo factory NACA are just wrong and will produce
> more drag and be less efficient than a proper NACA.  For the amount of work
> involved in both hands on construction and the amount of head scratching
> needed to build true NACA's, it is very hard not to go with the factory
> pre-fabs.
>
> If you decide to go with the true NACA, let me know and we can talk
> details.  Maybe I can save you some time.
>
> Jerry Brainard
>
>
> -------Original Message-------
> From: Richard D. Wallace, Jr.
> Subject: Re: REFLECTOR: Rudder Pedal stops
> Sent: Apr 14 '09 7:08pm
>
> Noel:
>
> I'm on the slow path also.  I got my kit for Christmas 2000.  My
> fuselage has the NACA scoops outlined on the top also.  What do you
> make the sides out of - BID?  Also what is the dimension on the
> opening in the firewall?
>
> Rick
>
> On Tue, Apr 14, 2009 at 6:28 PM,  <gattenby at tulsaconnect.com> wrote:
>> Rick.
>>
>> I'm taking the slow path to building an SUV as well (8 years and counting)
>> I've not done the pedal things as I'm missing some parts. (got my kit 2nd
>> hand)
>>
>> The NACA scoops can be bui! lt without the prefab inserts.
>> My kit predated the inserts.  They weren't that big a deal.
>> The kit had the lines drawn on the top, and I just cut them.
>>
>> If you need templates just let me know and I'll trace mine on paper.
>>
>> Noel
>>
>> On Tue, 14 Apr 2009 17:30:24 -0400
>>  "Richard D. Wallace, Jr." <rdwallace57 at gmail.com> wrote:
>>> Guys:
>>>
>>> I don't provide comments (lack of experience and I have
>>>a single door,
>>> fixed gear, dual yoke control SUV) but I do and have
>>>read all e-mails
>>> back and forth.  I seem to be just behind in
>>>construction than some
>>> and the need to ask questions is always unnecessary
>>>because the
>>> ! subject has already been discussed.  However, I have
>>>come up with two
>>> (2) questions:  1) do you need stops for the break
>>>pedals so they are
>>> not putting pressure on the master brake cylinder heads
>>>when the
>>> springs are pulling and your foot is not on the pedals?
>>>and 2)  is
>>> there a way to make the two (2) larger NACA scoops on
>>>top and in the
>>> back for the engine cooling from the existing fuselage
>>>or do you
>>> really need to buy the pre-fabricated ones from
>>>Velocity?
>>>
>>> Thanks!
>>>
>>> Rick Wallace
>>> _______________________________________________
>>> To change your email address, visit
>>>http://www.tvbf.org/mailman/listinfo/reflector
>>>
>>> Visi! t the gallery!  www.tvbf.org/gallery
>>> user:pw = tvbf:jamaicangoose
>>> Check new archives: www.tvbf.org/pipermail
>>> Check old archives:
>>>http://www.tvbf.org/archives/velocity/maillist.html
>>
>>
>> _______________________________________________
>> To change your email address, visit
>> http://www.tvbf.org/mailman/listinfo/reflector
>>
>> Visit the gallery!  www.tvbf.org/gallery
>> user:pw = tvbf:jamaicangoose
>> Check new archives: www.tvbf.org/pipermail
>> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>>
> _______________________________________________
> To change your email address, visit
> http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery!  www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>
>
>
> _______________________________________________
> To change your email address, visit
> http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery!  www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>


More information about the Reflector mailing list