REFLECTOR: Second flight

[Kevin Baker]

Forgot to mention he had me check to make sure the engine was generating 
The power it was suppose to and to decrease as much drag as I could.

Thanks
Kevin 

.

On Aug 20, 2012, at 12:33 PM, Scott Derrick <scott at tnstaafl.net> wrote:

> Thats way way to low! Craig has some funny ideas about how much power an engine makes at that low of RPM and how much runway is needed when your pitched that low.  
> 
> I don't know which engine you have but I assume its a IO360 200HP?
> 
> My sweet spot when I had that engine on a STD RG, was static of 2300-2350.  It was a rocket at sea level and barely enough at KGNT 6500 FT, density up to 10,000 in the summer.
> 
> I could cruise at 160KTAS turning 2700 RPM. Burning about 9 GPH LOP.  At 11,000 ft. I'd sometimes turn it up to 2750 and cruise at 165kias.
> 
> I would see 2300-2350 static, 2450 at 50KIAS and it would stay close to that up to about 80KIAS.  
> 
> 
> Scott
> 
> -------- Original Message --------
> Subject: Re: REFLECTOR: Second flight
> From: Geoff Gerhardt <geoff.gerhardt at gmail.com>
> To: Scott Derrick <scott at tnstaafl.net>
> Date: 08/20/2012 07:47 AM
>> Scott,
>> 
>> My static is 2050RPM.  I don't have RPM at the other airspeeds in my head, but I have the data log from the flights at home and can retrieve them tonight.  I talked to Craig a few weeks ago, and he indicated a static of 2050RPM was to be expected for that prop/engine combo.  He cuts a "longer" prop for an RG than a FG to allow for more top end with a cleaner plane.  I haven't wound it up to go past 120kts, yet.  Now that I know it flies ok, I'll head out this week and take it up to altitude to see how it does in cruise.
>> 
>> Thanks.
>> 
>> Geoff
>> 
>> On Mon, Aug 20, 2012 at 9:25 AM, Scott Derrick <scott at tnstaafl.net> wrote:
>> Geoff,
>> 
>>     I've tuned 3 props with Cato, IO360, TIO520 and IO520.  Never flew the TIO520.
>> 
>>     Whats your RPM at static, 50KIAS, 90 KIAS, 120KIAS, 160KIAS??
>> 
>>     The static and 50KIAS are the most important for takeoff performance.
>> 
>> Scott
>> 
>> 
>> 
>> -------- Original Message --------
>> Subject: REFLECTOR: Second flight
>> From: Geoff Gerhardt <geoff.gerhardt at gmail.com>
>> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>> Date: 08/20/2012 05:50 AM
>>> Guys,
>>> 
>>> I spent Sunday morning fixing a few issues that were identified in the first flight, then took her out for a second flight this afternoon.  I think I'm going to have to send my prop back to Craig to have it re-pitched, but I'd like to hear your input.  There's a link below to a post on my website that shows the flight video as well as a CloudAhoy analysis (if you're not familiar with CloudAhoy, its a very cool app for recording a flight).  With just me on board and only ~20gal of fuel, I need ~2200' of runway to lift off (DA 2000'), then I have to stay low to build up some speed to start my climb.  Once I can get to 90-100kts, I can climb ok, but I feel a bit unsure about flying into any 3000' runways with only 800' of wiggle room, particularly if there's any trees past the runway.  My prop is currently 66x74.  Have a look at the video and CloudAloft and let me know how this compares to your experience with a fixed-pitch prop.
>>> 
>>> Here's a link to the post on my website that describes the second flight and videos.
>>> http://thegerhardts.com/velocity/?p=513
>>> 
>>> Geoff
>>> 
>>> 
>>> 
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>> 
>> -- 
>> Realize deeply that the present moment is all you ever have.
>> Eckhart Tolle 
>> 
>> 
>> 
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> 
> -- 
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