Today's Message Index:
----------------------
1. 12:36 AM - Thrust line? (heisan)
2. 06:45 AM - Re: Thrust line? (LarryMcFarland)
3. 08:05 AM - Re: Thrust line? (Jeyoung65@aol.com)
4. 08:07 AM - Re: Thrust line? (heisan)
5. 08:23 AM - Re: Thrust line? (Gig Giacona)
6. 08:32 AM - Re: Thrust line? (heisan)
7. 09:31 AM - Re: Re: Thrust line? (Bryan Martin)
8. 04:08 PM - Grounding Of Fuel Senders (Dave VanLanen)
Message 1
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Hi all,
I will soon be the owner of a partially complete HDS kit, and am busy engine shopping.
I have found an 80hp AeroVee engine that was removed from a HD. It flew the aircraft
reasonably well, but take-off performance was really bad.
I was considering buying the engine and fitting a reduction drive and in flight
adjustable Ivo Prop to make the most out of the engine.
Now the question is, how sensitive is the HDS to thrust line? I can keep the existing
engine mount, which will move the thrust line up 130mm (5") from the standard
position, or I can invest a bit more in a new engine mount.
I see from the photo's on Zeniths website that there is at least one HD out there
with a redrive and a high thrust line, so it can't be all bad?
If anybody knows how good/bad a 130mm higher thrust line will be, I would appreciate
any feedback!
Thanks,
Justin
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=218844#218844
Message 2
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| Subject: | Re: Thrust line? |
Hi Heisan,
I'd reconsider the 80-hp AeroVee on the HDS. 80-hp is marginal on the
wing area of the HDS where the HD would only be adequate.
I've a Subaru which delivers 100 hp and an a friends HD with the same
engine setup could out climb the HDS making my aircraft feel
completely anemic. I could go faster, but climb with 80-hp in an HDS
isn't a good thing unless you intend to keep it under 650 lbs empty.
Larry McFarland 601HDS at www.macsmachine.com
heisan wrote:
>
> Hi all,
>
> I will soon be the owner of a partially complete HDS kit, and am busy engine
shopping.
>
> I have found an 80hp AeroVee engine that was removed from a HD. It flew the
aircraft reasonably well, but take-off performance was really bad.
>
> I was considering buying the engine and fitting a reduction drive and in flight
adjustable Ivo Prop to make the most out of the engine.
>
> Now the question is, how sensitive is the HDS to thrust line? I can keep the
existing engine mount, which will move the thrust line up 130mm (5") from the
standard position, or I can invest a bit more in a new engine mount.
>
> I see from the photo's on Zeniths website that there is at least one HD out there
with a redrive and a high thrust line, so it can't be all bad?
>
> If anybody knows how good/bad a 130mm higher thrust line will be, I would appreciate
any feedback!
>
> Thanks,
> Justin
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=218844#218844
>
>
>
Message 3
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| Subject: | Re: Thrust line? |
Justin, I would not move the thrust line up 5" without changing engine
mount. It will change you aircraft stability. I do not know where the CG (that
POINT were the aircarft will hang level on a string) is on a HDS. I think it is
just below the thrust line so you would be moving it above the CG. Jerry of
GA
In a message dated 12/11/2008 3:36:27 A.M. Eastern Standard Time,
justin@expertron.co.za writes:
--> Zenith601-List message posted by: "heisan" <justin@expertron.co.za>
Hi all,
I will soon be the owner of a partially complete HDS kit, and am busy engine
shopping.
I have found an 80hp AeroVee engine that was removed from a HD. It flew the
aircraft reasonably well, but take-off performance was really bad.
I was considering buying the engine and fitting a reduction drive and in
flight adjustable Ivo Prop to make the most out of the engine.
Now the question is, how sensitive is the HDS to thrust line? I can keep
the existing engine mount, which will move the thrust line up 130mm (5") from
the standard position, or I can invest a bit more in a new engine mount.
I see from the photo's on Zeniths website that there is at least one HD out
there with a redrive and a high thrust line, so it can't be all bad?
If anybody knows how good/bad a 130mm higher thrust line will be, I would
appreciate any feedback!
Thanks,
Justin
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=218844#218844
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Message 4
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| Subject: | Re: Thrust line? |
I am a bit worried about that. My empty weight should be well under 300lbs though.
Also, the VP prop will allow me to climb at max continuous RPM (3400), so
it will climb a lot better than a stock 80hp setup.
The problem with the subies is the price. I have gotten quotes from RAM and Stratus,
and both were ridiculous - once shipping and duties are added, they cost
substantially more than a brand new 120hp Jab!
The only cost effective engine I can lay my hands on is the VW.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=218904#218904
Message 5
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| Subject: | Re: Thrust line? |
heisan wrote:
>
>
> The only cost effective engine I can lay my hands on is the VW.
Check out a corvair. www.flycorvair.com
--------
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=218914#218914
Message 6
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| Subject: | Re: Thrust line? |
Gig Giacona wrote:
>
> heisan wrote:
> >
> >
> > The only cost effective engine I can lay my hands on is the VW.
>
>
> Check out a corvair. www.flycorvair.com
WW hasn't responded to any of my emails, but I am chatting to the guys at Aeromax
now.
Spares are a problem though, as no corvair cars were ever sold in South Africa,
so all spares need to be imported. Cost is also very high for what you get (only
20% cheaper than a Jab 3300).
I really want to pust that 120hp Jabiru in, but just can't afford it...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=218917#218917
Message 7
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| Subject: | Re: Thrust line? |
You might want to consider obtaining or building a set of HD wings for
your airplane, that will significantly improve climb rate with
whatever engine you put in it. You will lose some speed but that will
just give you more time to enjoy the flight. :)
As I recall, the 601HD was originally designed around a 65 HP engine,
so if you can actually get 80 HP out of a VW conversion and your
density altitude isn't too bad, you should do OK. Fight the urge to
add any unnecessary accessories, keep that empty weight down.
> <justin@expertron.co.za>
>
> I am a bit worried about that. My empty weight should be well under
> 300lbs though. Also, the VP prop will allow me to climb at max
> continuous RPM (3400), so it will climb a lot better than a stock
> 80hp setup.
>
--
Bryan Martin
N61BM, CH 601 XL,
RAM Subaru, Stratus redrive.
do not archive.
Message 8
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| Subject: | Grounding Of Fuel Senders |
I have attended a couple of forums at AirVenture on the subject of aircraft
electrical systems, and the presenters have been consistent in recommending
the routing of a return wire from every component to the universal ground
bus, to help insure that there are no "ground loops" introduced into the
system that can cause electrical problems. I personally think this is
relatively cheap insurance against grounding issues, and I plan to follow
this advice. However, with the VDO fuel senders, the sender is not designed
to be isolated from the fuel tank / airframe because the inner mounting ring
and mounting screws are in metal-to-metal contact with the fuel tank and
sender case, and thus are also connected to the airframe by virture of the
grounding strap installed from the fuel tank to the airframe. And even if
the sender were to be isolated from the tank and airframe via use of
shoulder washers under the mounting screws, there is no grounding lug on the
case of the sending unit itself to attach a return wire to. Has anyone
experienced any "ground loop" or other electrical issues with the senders
when grounding via a mounting screw as instructed by ZAC? Has anyone
figured out a simple way to isolate the sender from the airframe and install
an attachment to the sender case for a return wire to the ground buss?
Thanks,
Dave Van Lanen
601XL - working on wings
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