REFLECTOR: Engine Selection

Wed Jun 16 22:38:34 CDT 2004

 J. P. Books, 
                                                                                                                                                                                                                                                            I apologize, I should not have used the word foolish, and I certainly did not to mean imply that you were foolish to devote the time, effort ,and money that you have spent on this project. I admire your preservence in the face of the many setbacks that you have had. 

As I said, I think that the inverted V engine will be a great engine when properly developed and tested. I was simply expressing great skepticism that that engine will be ready for customers in Dec 2004 as your web site implies. I think that the past history of this entire project justifies my feelings in this regard.

Incidentally, I am not flying with a Lycoming. I went really retro, I have a Franklin, which I consider to be a piece of junk.

Don Royer

----- Original Message ----- 
From: J.P. Brooks 
To: Velocity Aircraft Owners and Builders list
Sent: 6/16/2004 3:49:06 PM 
Subject: Re: REFLECTOR: Engine Selection

We ran the inverted just before OSH last year.  Foolish to consider?... or foolish to buy when it does fly?... or foolish to buy and install when I does fly and make the horsepower?...   or, foolish to consider or buy or install or believe it may just make the horsepower and have the fuel economy?......    A through D we must be foolish just to try to build it... right?

JP, chief fool, DeltaHawk, Inc.
Don, what engine do you use now and how much did it cost you to build?

At 02:39 PM 6/16/2004, you wrote:

Call me foolish, then, although they have built the inverted version and have begun testing it.  That's the one I'm planning to use.

Doug

----- Original Message ----- 

From: Donald Royer 

To: Velocity Aircraft Owners and Builders list 

Sent: Wednesday, June 16, 2004 3:44 PM

Subject: Re: REFLECTOR: Engine Selection

I saw the test plane at Oshkosh last summer. To me the hump in the cowling required for the upright V engine utterly ruins the lines of the plane. I though that it was really ugly. If and when the inverted V is ready and flying, it should be a very attractive option. However, considering the very slow development history of the engine, I feel that anyone would be foolish to consider using the inverted V engine before it is actually built and flying.

I had very enthusiastic plans to use the Delthawk eight years ago.

Don Royer

----- Original Message ----- 

From: Douglas Holub 

To: Velocity Aircraft Owners and Builders list

Sent: 6/16/2004 1:13:24 PM 

Subject: Re: REFLECTOR: Engine Selection

Plenty of power. He's got a 173 RG. The Velocity was originally designed for 160 hp.  The DH180A4 is 180 hp up to 18,000 feet. The DH200A4 is 200 hp at 18,000 ft. Plus, the diesel has better torque at lower RPMs than a Lycoming, and propellers are more efficient at lower RPMs. Plus it weighs less if you take into account that it is 30% more fuel efficient, so you don't need to carry as much fuel weight to get the same range. A DH160V4 is in the factory's test airplane.  With the 160 hp engine they clocked it at 202 mph at 15,500 feet, and 161 mph at 5,500 feet. And that is with a fixed pitch propeller.

The DeltaHawk has half the moving parts of a Lycoming, no spark ignition to interfere with the radios, and burns readily available and slightly cheaper Jet A.  It is much smoother because it's a two-stroke. Plus, since the DeltaHawk test platform is a Velocity Std RG, the firewall foreward package is pre-designed.

No, I don't own stock in the company. Just excited about the first significant improvement in general aviation powerplants in 50 years.

Doug Holub

Std Top Door, 50% done, 80% to go

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