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601 HDS - how fast is it really

 
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heisan



Joined: 19 May 2008
Posts: 22

PostPosted: Sat May 24, 2008 1:40 pm    Post subject: 601 HDS - how fast is it really Reply with quote

Hi again,

I am still busy researching the 601 HDS before building. While browsing the net, I see very few people getting anywhere near the cruise speed mentioned on the Zenith website (135mph cruise on Rotax 912).

Would it be possible to get some real speeds measured by builders/pilots please? I would like to know IAS and alltitude, as well as what engine is in the aircraft.

Also, I saw a note on one website that their is a 'new' HDS wing that is thinner and faster. The web site dates from the early 2000's though. Is this true? If so, what plan numbers include the new wing?

Thanks!
Justin


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larry(at)macsmachine.com
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PostPosted: Sat May 24, 2008 3:08 pm    Post subject: 601 HDS - how fast is it really Reply with quote

Hi Justin,
I doubt there are any HDSs with the 912 seeing those numbers. That
said, the HDS is capable of decent speeds when the prop is pitched long,
it has the proper fairings and the plane is lightly loaded at an
altitude of over 3500 feet. My Stratus Subaru with the prop pitched at
17-degrees and the 9-1/2 gallon header tank full and just me in the
plane, can easily be trimmed out to reach 133 mph at 5000 rpm. At 4600
rpm it does a 120 mph cruise and fully loaded, it complies with the LSA
performance standard for stall speed. If you want to go faster, though,
you'll only have to go with a Corvair or a Jabaru 3300. It will climb
at 1000 fpm lightly loaded as described as the Stratus does deliver 100
h.p.as well as any other 100 h.p. engine on 87-octane or 100 LL.

I don't believe there ever was a thin HDS wing. The HDS is faster than
the HD, but if you seriously need real lift and climb, you need to go
with the HD wing. There's a considerable difference between the two. To
climb half as well as the HD, I'd have to bring the pitch from 17 back
to 15 degrees and then the speed would be compromised.

Curious you'd build an HDS when the XL is the latest aircraft in the
Zenith series. Aside from the heavy landing gear spring, it's a great
airplane, easy speed, flaps etc.

Larry McFarland 601HDS at www.macsmachine.com
heisan wrote:
Quote:


Hi again,

I am still busy researching the 601 HDS before building. While browsing the net, I see very few people getting anywhere near the cruise speed mentioned on the Zenith website (135mph cruise on Rotax 912).

Would it be possible to get some real speeds measured by builders/pilots please? I would like to know IAS and alltitude, as well as what engine is in the aircraft.

Also, I saw a note on one website that their is a 'new' HDS wing that is thinner and faster. The web site dates from the early 2000's though. Is this true? If so, what plan numbers include the new wing?

Thanks!
Justin


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=184670#184670



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heisan



Joined: 19 May 2008
Posts: 22

PostPosted: Sun May 25, 2008 11:35 pm    Post subject: Re: 601 HDS - how fast is it really Reply with quote

larry(at)macsmachine.com wrote:
Hi Justin,
I doubt there are any HDSs with the 912 seeing those numbers. That
said, the HDS is capable of decent speeds when the prop is pitched long,
it has the proper fairings and the plane is lightly loaded at an
altitude of over 3500 feet.


I wonder how the factory does it. The Sport Pilot flight test claims 138mph (indicated) at 2000' at near gross weight.

Quote:
My Stratus Subaru with the prop pitched at
17-degrees and the 9-1/2 gallon header tank full and just me in the
plane, can easily be trimmed out to reach 133 mph at 5000 rpm. At 4600
rpm it does a 120 mph cruise and fully loaded, it complies with the LSA
performance standard for stall speed. If you want to go faster, though,
you'll only have to go with a Corvair or a Jabaru 3300. It will climb
at 1000 fpm lightly loaded as described as the Stratus does deliver 100
h.p.as well as any other 100 h.p. engine on 87-octane or 100 LL.


OK - So it will probably do it on 100hp with spats and a few aerodynamic clean-ups...

Quote:
Curious you'd build an HDS when the XL is the latest aircraft in the
Zenith series. Aside from the heavy landing gear spring, it's a great
airplane, easy speed, flaps etc.


I was initially considering the HDS because I may be able to get a well built airframe at a very good price. Also, if the Zenith specs are to be believed, then the HDS is substantially faster per hp than the XL. The higher wing loading should also make it more comfortable in the turbulence that we regularly experience around here...

The XL has very little extra to offer, unless it lives up to Zenith's performance figures more reliably than the HDS.

Thanks for the info.
Justin


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daveaustin2(at)primus.ca
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PostPosted: Mon May 26, 2008 1:41 am    Post subject: 601 HDS - how fast is it really Reply with quote

My 601 HDS with 912UL and Arplast air adjustable prop will cruise at 120 mph
IAS at 3500 ft. running 5300 rpm.
I have some drag reduction, radiator and oil cooler in cowl and wing root
fairings.
I think that IAS is approx 5 mph too high by comparison with other a/c.
Dave Austin 601HDS - 912, Spitfire Mk VIII


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naumuk(at)alltel.net
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PostPosted: Mon May 26, 2008 6:32 am    Post subject: 601 HDS - how fast is it really Reply with quote

Justin-
We'll know probably next year how an HDS performs vs an XL. My buddy
Lynn Dingfelder and I both built up Corvairs; he has an XL while I have an
HDS airframe. Although my basic airframe is a couple of pounds heavier than
his, I'm going glass panel while he went steam gauge. He's painting, while
I'm polishing. Should be really close in the long run, weight-wise.
I must be getting optimistic in my old age. There was a long time I
doubted if I'd ever get my project in the air!
Good building!
Bill
do not archive
---


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