REFLECTOR: Deltahawk engine

[Al Gietzen]

Does anybody know which of the 160, 180 and 200 models can fly the longest 

distance on a given amount of fuel, at its normal cruising speed?

 

The lowest BSFC should provide the best mpg.  In general, more speed takes
more horsepower takes more fuel; but throttling back the 200hp may provide
better range if it can achieve a better BSFC.  The folks at DH will have to
answer that one.  Lots of factors can affect it.  Are you going to carry
oxygen?  High altitude may be the key.

 

I understand the the only "drawback", if we can call it so, of a 200 model 

is the intercooler, which may slightly complicate the installation.  Can 

anybody think of any drawback of the 180 model in contrast to the 160 one? 

TBO? (let's ignore the price and assume a constant speed propeller)  I'm 

not decided which of the DH engines to pick, so I'd like to understand all 

the factors before choosing one.

 

I wouldn't consider an intercooler a complication; but perhaps a necessity
that is part of the turbo charging package.  Yes, it takes up some space in
the cowling, and may get in the way for servicing, but it provides an
important increase in efficiency by cooling the induction charge (increase
density) that has been heated by the turbo/super charging.  One key
requirement is good ducting design for the intercooler airflow to minimize
any additional drag.

 

Also, another important issue: insurance!  Everything else being equal, is 

the insurance for a Velocity with a DH engine any higher than for one with 

a Lycoming?  Also, it seems that Deltahawk will soon certify their engine. 

My dumb guess is that they will first certify the 160 model, in which case 

the insurance of a Velocity with DH160 may be lower ... Any thoughts on 

that?

 

My guess is that this is not a question that can be answered yet.  My
understanding is it may be more a question of whether you can, or can't, get
hull coverage.  One would certainly expect that full coverage would be more
attainable with a certified engine.

 

My $.02 worth.

 

Al

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