Today's Message Index:
----------------------
1. 03:31 PM - prop recommendations for 447 on firestar or firefly (Jay Dub)
2. 04:20 PM - Re: prop recommendations for 447 on firestar or firefly (Stuart Harner)
3. 04:41 PM - Re: prop recommendations for 447 on firestar or firefly (Larry Cottrell)
4. 04:41 PM - Re: prop recommendations for 447 on firestar or firefly (George Helton)
Message 1
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| Subject: | prop recommendations for 447 on firestar or firefly |
I have a 68" Ivoprop ground adjustable that came with my 447 (both used)for my
Firestar. Does anyone know what the recommended prop diameter/pitch is for the
447 powered firestar or firefly? I have flown with Ivoprops in the past and never
cared for them (it seems the flex/coninggives them a lot of "slip" making
them very inefficient, but I could be wrong). Every ultralight in the 90's I
flew with an ivo burned a lot more fuel than the fixed 60x38 or 60x40 wood props
and took longer in takeoff as well as cruised slower (my own observations but
that was all with CGS Hawks flying 447s and not Kolbs). Since wood props are
just as or more expensive these days as to a composite, I'm wondering what the
wisdom is these days for a prop? What wood prop came with the 447 firestars
or fireflies of yore? What are the recommended composite props these days?
I had an unmarked (brand) 60x40 wood prop that gave me 60 mph cruise in a Hawk
burning 1.5 gallons an hour consistently. Before that I had a 60x38 Culver (made
in PA) that burned closer to 1.8 gal/hr cruising at 60. I still have the 60x40
but long story short, it's split from hitting a green jolly rancher candy
and that ruined it so it hangs on my living room wall. I wish I knew the brand
as I'd buy one in a heartbeat but my guess it was a Tennessee prop.
Thanks,
Jay
Message 2
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| Subject: | Re: prop recommendations for 447 on firestar or firefly |
My Firefly has a 60" 3 blade Warp Drive on the 447 with a 2.58:1 "B" box.
Smooth, quiet and powerful, but I don't get much better than 4 G/Hr.
4800 to 5000 engine RPM will push the Firefly ~65 MPH.
The 3 blade makes it fit in the camper/hangar nicely.
On 7/12/23 17:31, Jay Dub wrote:
>
> I have a 68" Ivoprop ground adjustable that came with my 447 (both used)for my
Firestar. Does anyone know what the recommended prop diameter/pitch is for the
447 powered firestar or firefly? I have flown with Ivoprops in the past and
never cared for them (it seems the flex/coninggives them a lot of "slip" making
them very inefficient, but I could be wrong). Every ultralight in the 90's
I flew with an ivo burned a lot more fuel than the fixed 60x38 or 60x40 wood props
and took longer in takeoff as well as cruised slower (my own observations
but that was all with CGS Hawks flying 447s and not Kolbs). Since wood props
are just as or more expensive these days as to a composite, I'm wondering what
the wisdom is these days for a prop? What wood prop came with the 447 firestars
or fireflies of yore? What are the recommended composite props these days?
>
> I had an unmarked (brand) 60x40 wood prop that gave me 60 mph cruise in a Hawk
burning 1.5 gallons an hour consistently. Before that I had a 60x38 Culver (made
in PA) that burned closer to 1.8 gal/hr cruising at 60. I still have the
60x40 but long story short, it's split from hitting a green jolly rancher candy
and that ruined it so it hangs on my living room wall. I wish I knew the brand
as I'd buy one in a heartbeat but my guess it was a Tennessee prop.
>
> Thanks,
> Jay
>
>
Message 3
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| Subject: | Re: prop recommendations for 447 on firestar or firefly |
It's been a while since I used a 447, but the rule of thumb was to
maintain at least an inch of clearance between the end and the tail
boom. I used a warp drive after my wooden prop and an IVO. They are
indestructible, and a great prop.
Since the hangar is just outside my door, I decided to measure it. The
prop is tip to tip- 66 inches with a 2 1/2 extender. This prop has
been on a 447, a 503 and now on a HKS. John Hauck recommended it to
me, and I concur that it is a great prop.
Larry
On Wed, Jul 12, 2023 at 4:34PM Jay Dub <bearhawk@gmx.com> wrote:
>
>
> I have a 68" Ivoprop ground adjustable that came with my 447 (both used)for my
Firestar. Does anyone know what the recommended prop diameter/pitch is for the
447 powered firestar or firefly? I have flown with Ivoprops in the past and
never cared for them (it seems the flex/coning gives them a lot of "slip" making
them very inefficient, but I could be wrong). Every ultralight in the 90's
I flew with an ivo burned a lot more fuel than the fixed 60x38 or 60x40 wood
props and took longer in takeoff as well as cruised slower (my own observations
but that was all with CGS Hawks flying 447s and not Kolbs). Since wood props
are just as or more expensive these days as to a composite, I'm wondering what
the wisdom is these days for a prop? What wood prop came with the 447 firestars
or fireflies of yore? What are the recommended composite props these days?
>
> I had an unmarked (brand) 60x40 wood prop that gave me 60 mph cruise in a Hawk
burning 1.5 gallons an hour consistently. Before that I had a 60x38 Culver (made
in PA) that burned closer to 1.8 gal/hr cruising at 60. I still have the
60x40 but long story short, it's split from hitting a green jolly rancher candy
and that ruined it so it hangs on my living room wall. I wish I knew the brand
as I'd buy one in a heartbeat but my guess it was a Tennessee prop.
>
> Thanks,
> Jay
>
>
--
The older I get, the less tolerant I am of those who are intolerant of others.
If you forward this email, or any part of it, please remove my email
address before sending.
Message 4
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| Subject: | Re: prop recommendations for 447 on firestar or firefly |
Sent from my iPhone
> On Jul 12, 2023, at 7:30 PM, Stuart Harner <stuart@harnerfarm.net> wrote:
>
>
> My Firefly has a 60" 3 blade Warp Drive on the 447 with a 2.58:1 "B" box.
>
> Smooth, quiet and powerful, but I don't get much better than 4 G/Hr. 4800 to
5000 engine RPM will push the Firefly ~65 MPH.
>
> The 3 blade makes it fit in the camper/hangar nicely.
>
>
>> On 7/12/23 17:31, Jay Dub wrote:
>>
>> I have a 68" Ivoprop ground adjustable that came with my 447 (both used)for
my Firestar. Does anyone know what the recommended prop diameter/pitch is for
the 447 powered firestar or firefly? I have flown with Ivoprops in the past and
never cared for them (it seems the flex/coning gives them a lot of "slip" making
them very inefficient, but I could be wrong). Every ultralight in the 90's
I flew with an ivo burned a lot more fuel than the fixed 60x38 or 60x40 wood
props and took longer in takeoff as well as cruised slower (my own observations
but that was all with CGS Hawks flying 447s and not Kolbs). Since wood props
are just as or more expensive these days as to a composite, I'm wondering what
the wisdom is these days for a prop? What wood prop came with the 447 firestars
or fireflies of yore? What are the recommended composite props these days?
>> I had an unmarked (brand) 60x40 wood prop that gave me 60 mph cruise in a Hawk
burning 1.5 gallons an hour consistently. Before that I had a 60x38 Culver
(made in PA) that burned closer to 1.8 gal/hr cruising at 60. I still have the
60x40 but long story short, it's split from hitting a green jolly rancher candy
and that ruined it so it hangs on my living room wall. I wish I knew the brand
as I'd buy one in a heartbeat but my guess it was a Tennessee prop.
>>
>> Thanks,
>> Jay
>>
>>
>>
>>
>
>
>
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