REFLECTOR: Reflector Digest, Vol 87, Issue 124

Wed Jun 20 13:58:59 CDT 2012

If I had BETA range I might taxi backwards to avoid FOD to prop. Have to put in a rear view mirror. Now that would freak out the Spam Can drivers!

Mark B. Magee
Sent from IPhone 4

On Jun 20, 2012, at 12:09 PM, Jones Nick <nick.jones at volvo.com> wrote:

> Mark, roger that on the Beta. I think that was offered at one time from AeroComposite. Toyed with the idea for that very reason, not much wear and tear on the brakes. Also, makes backing out of a parking spot a snap since canards have to park opposite all the tractor planes... the correct way I might add.
> 
> Best regards,
> 
> Nick and Connie Jones
> Velocity XL-RG
> N10CN
> 99% done 90% to go
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Mark Magee
> Sent: Wednesday, June 20, 2012 12:00 PM
> To: Velocity Aircraft Owners and Builders list
> Cc: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Reflector Digest, Vol 87, Issue 124
> 
> Hi Nick,
> Interesting. I'm not familiar, but accept you're correct. I thought you could 'crank' a FULL FEATHERED prop out of feather by starting it and regaining oil pressure, using the starter motor to get the spinning started again. That is as you say in one feathered for practicing Single Engine OPs but still functioning.
> Nonetheless, irrespective of CS prop functionality, few of us if any can go to FEATHER on the pusher CS props offered.
> I would like feather and quite frankly BETA range as well. 
> T34C had BETA range and would throw you forward in the straps when selected. Saves big time on the brakes.
> 
> Mark B. Magee
> Sent from IPhone 4
> 
> On Jun 20, 2012, at 10:17 AM, Jones Nick <nick.jones at volvo.com> wrote:
> 
>> Mark, I think you have the reservoir function mixed up. My C-310 had full feathering props (as do all other twins) and I didn't have a reservoir. The reservoir acted as an accumulator for getting the prop out of feather. I feathered the props on my twin as a matter of practice at altitude and the drag difference is dramatic between a feathered prop and a windmilling prop. Without the reservoir (accumulator) I had to get the engine started to get the oil going before I could bring it out of feather. If the engine was windmilling and had oil pressure, the prop would feather.
>> 
>> Best regards,
>> 
>> Nick and Connie Jones
>> Velocity XL-RG
>> N10CN
>> 99% done 90% to go
>> 
>> -----Original Message-----
>> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Mark Magee
>> Sent: Wednesday, June 20, 2012 11:06 AM
>> To: Velocity Aircraft Owners and Builders list
>> Cc: Velocity Aircraft Owners and Builders list
>> Subject: Re: REFLECTOR: Reflector Digest, Vol 87, Issue 124
>> 
>> Hi Kevin,
>> FULL FEATHER is best case scenario for any propeller driven aircraft that has lost power. We don't see it available so much in GA because it can require a hydraulic pressure reservoir. With a dead engine the windmilling is now the power source that turns the oil pump that controls the prop pitch. As pitch approaches FEATHER prop drastically slows down, as does oil pump, as does oil pressure required to continue pushing the blades to FEATHER. With no oil pressure reservoir (large and heavy) getting that blade those last 20-50 degrees to FEATHER becomes impossible as their is no more oil pressure left to push the hub. This is all assuming you haven't bled out your oil. Commercial turboprops will most likely have a hydraulic reservoir to get to feather, which will be the least drag/best glide or single engine performance profile.
>> 
>> Mark B. Magee
>> N34XL XLFG
>> Sent from IPhone 4
>> 
>> On Jun 20, 2012, at 9:41 AM, Kevin Baker <flykb at verizon.net> wrote:
>> 
>>> So to add to that thought..
>>> What about the props that go to full feather when the engine quits...
>>> I seem to remember a cs prop mfg that does that.
>>> 
>>> Thanks
>>> Kevin Baker
>>> 
>>> .
>>> 
>>> On Jun 20, 2012, at 8:11 AM, Brooke Wolf <bwolf1 at tds.net> wrote:
>>> 
>>>> Not an expert Don, but I think you are right (others please chime in).  When you are out of oil you are SOL.  You are going to be landing closer to current position because without oil pressure, your prop resorts to fine pitch resulting in more drag.  But don't worry too much….spin that prop too long with no oil and you will end up with a stopped prop.  Less Drag!  Isn't that swell :>)   That is a good question about windmilling in course .vs. stopped in fine.  Don't know the answer.
>>>> 
>>>> Brooke
>>>> 
>>>> 
>>>> 
>>>>> There's one point missing from this conversation:
>>>>> 
>>>>> There are a lot of ways an engine can fail. Pulling the prop control back to improve the glide is only going to work in some of those failure modes. On an engine with a non-electric prop governor, pulling the prop control back is only going to help if A) there is oil in the engine and B) the engine is turning. If the failure is a result of no oil or the engine isn't turning, pulling the prop control back won't affect the prop. 
>>>>> 
>>>>> Which then brings up the topic of what is the drag difference of a stopped prop in fine (control forward) mode vs. windmilling in course (control back) mode?
>>>>> 
>>>>> Now discuss. :-)
>>>>> 
>>>>> -Don
>>>>> 
>>>>> 
>>>>> 
>>>> 
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