REFLECTOR: Prop size

[Dennis Martin]

Kurt,

Craig modeled my prop from his experience with other Chevy applications. I
still wonder, however, if 68" maximizes my HP. Guess we'll just have to race
sometime. There's no question that prop designs are influenced by black
magic. So, why can't Craig make my prop longer?

Dennis

On Sun, Oct 11, 2009 at 3:40 PM, <nmflyer1 at aol.com> wrote:

> Dennis,
>
> Well.. Good question, but I'm not the guy to ask. I recall that, when
> trying to find a good prop for my V, most prop makers didn't have much idea
> what to do unless they had tried it many times before.
> Mine is an IVO as you know (the CS Magnum version). He was the only one at
> the time that asked knowledgeable questions, thought about my install, and
> decided what would be best with what we had to work with. Because of our
> tremendous V-6 torque due to the redrive, he said that I would need a BIG
> PROP to use my power efficiently.
>
> Due to my density altitude and power, I decided to go with the IVO Constant
> speed. I also can trim the blades if need be without much hassle. Easier to
> trim than lengthen for sure.
>
> If he can "re-cut your blades longer",  he's a magician :)
> Craig would definitely be the one to ask on width versus length (prop wise
> at least :)
>
> If I remember right, I have almost 10" of clearance from the hangar floor
> to the prop (unloaded). Looks close to me, but apparently it is fine for a
> Velocity
>
> Kurt
>
>
> -----Original Message-----
> From: Dennis Martin <dennis.doc at gmail.com>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Sent: Sun, Oct 11, 2009 1:29 pm
> Subject: Re: REFLECTOR: Door strut review
>
>  A 76" prop? Size matters, eh? Now we all have prop envy. I made a point
> of telling Craig Catto that I had lots of ground clearance, but I did not
> dictate the length. I assumed he would take advantage of my extra height, at
> least the same as yours or more (I've forgotten exact clearance). He went
> for a wider paddle and kept it at 68". Which is better? I haven't installed
> it. Should I consider having him re-cut my blades longer?
>
> All the best,
> Dennis
>
> On Fri, Oct 9, 2009 at 10:24 PM, <nmflyer1 at aol.com> wrote:
>
>> Al,
>>
>> My doors do not go over center to the point where there is a noticeable
>> downward positive force on the doors. You can push them downward and let
>> go.. then they just stop. I think I found the sweet spot for my design, in
>> that you can gently push them upward and they will stay where you put them.
>>
>> Honestly, after paint, door panels & upholstery, another few pounds of
>> force could not hurt, but I have not found it necessary.
>>  I believe my design is aesthetically better than the factory one, but
>> folks over about 5'10" may have to duck a bit. A small price to p ay for
>> such a nice looking aircraft.
>>
>> One more thing, I think my Velocity is taller (at the door base) than
>> most. That is to accommodate the 76" 3-blade prop I have to (hopefully)
>> handle my engine install.
>>
>> Patiently waiting for a nose gear
>>
>> Kurt Winker
>>
>>
>>
>> -----Original Message-----
>> From: Al Gietzen <ALVentures at cox.net>
>> To: 'Velocity Aircraft Owners and Builders list' <reflector at tvbf.org>
>> Sent: Fri, Oct 9, 2009 11:34 am
>> Subject: Re: REFLECTOR: Door strut review
>>
>>
>>  Al,
>>
>>  Well I have both doors off right now, so I'll have to wait a bit to get
>> you a complete picture. here's what I did though:
>>
>> Kurt;
>> Thanks – I understand what you did on the reinforcing.  Mounting the
>> strut bracket further down on the door frame gives it better leverage on the
>> door.  Does it go over-center before the door is closed?
>> Al
>>
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>
>
>
> --
> All the best,
> Dennis
>
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-- 
All the best,
Dennis
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