Today's Message Index:
----------------------
1. 09:54 AM - Heavy Right Wing... (Matt Dralle)
2. 10:05 AM - Low RPM/High MP vs. High RPM/Low MP... (Matt Dralle)
3. 04:47 PM - Re: Heavy Right Wing... (Jeff Hove)
4. 08:52 PM - Re: Heavy Right Wing... (Matt Dralle)
5. 09:00 PM - Re: Low RPM/High MP vs. High RPM/Low MP... (Matt Dralle)
Message 1
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| Subject: | Heavy Right Wing... |
Dear Listers,
Well, taking the RV-8 in for paint is getting closer and closer and I'm trying
to get all the little things that need doing done before then. Dealing with the
heavy right wing is the next thing on the list. Currently, at low speed I
have about neutral aileron trim. The faster I go, the more LEFT trim I need.
Above 200mph, I run out of left trim and the left aileron is noticeably "up",
maybe .125" or so. Both of my ailerons are "chubby" at the trailing edge. I
wanted to confirm with the List that "squeezing" the RIGHT aileron will add a
bit of lift on the RIGHT side and hopefully neutralize the issue?
Thanks!
Matt
-
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 160+ Hours TTSN - Paint job is all that's left...
Message 2
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| Subject: | Low RPM/High MP vs. High RPM/Low MP... |
Dear Listers,
With the IO-390 and Hartzell 72" CS on my RV-8, a combination of 2150 RPM and 25-26
MP gives me nice 200MPH True and about 10.5-10.8 GPH. These number are down
low, maybe 3000ft. Higher altitude gives lower GPHs. At 2150, the cockpit
is pretty quiet too.
Increasing the RPM and Decreasing the MP doesn't really change the GPH that much,
but starts dropping the speed.
In all configurations, I'm running LOP at about 1360 on the hottest cylinder.
Oil temps are about 178 F. Max MP at low altitude is about 28-29.
Are there any issues running in a low-RPM, high-MP configuration as described above?
Thanks,
-
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 160+ Hours TTSN - Paint job is all that's left...
Message 3
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| Subject: | Re: Heavy Right Wing... |
Hello Matt,
See http://www.vansaircraft.com/pdf/Wing_Heavy.pdf which says to squeeze
the aileron on the LIGHT wing (left in your case). However they first
suggest some other steps.
My father's RV-7A had a heavy right wing so he lowered the right aileron
outboard and inboard hinge points to take away most of the problem.
Blue Skies,
Jeff Hove
Matt Dralle wrote:
>
>
> Dear Listers,
>
> Well, taking the RV-8 in for paint is getting closer and closer and I'm trying
to get all the little things that need doing done before then. Dealing with
the heavy right wing is the next thing on the list. Currently, at low speed
I have about neutral aileron trim. The faster I go, the more LEFT trim I need.
Above 200mph, I run out of left trim and the left aileron is noticeably "up",
maybe .125" or so. Both of my ailerons are "chubby" at the trailing edge.
I wanted to confirm with the List that "squeezing" the RIGHT aileron will add
a bit of lift on the RIGHT side and hopefully neutralize the issue?
>
> Thanks!
>
> Matt
>
> -
> Matt Dralle
> RV-8 #82880 N998RV
> http://www.mattsrv8.com - Matt's RV-8 Construction Log
> http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
> Status: 160+ Hours TTSN - Paint job is all that's left...
>
>
>
Message 4
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| Subject: | Re: Heavy Right Wing... |
Thanks to everyone for the great feedback on this issue!!
I went out after work tonight and had a look at the aileron alignment and sure
enough, the outboard edge of the right aileron was high by about 1/16-3/32 of
an inch. I took the hinge off the aileron and elongated the holes slightly and
reassembled, dropping the outboard side by about 1/16". I went out and took
it up to about 220mph and now - are you ready for this - it requires full RIGHT
trim! Completely the opposite from before. So, obviously I need to reduce
the drop by 50% and I should be dead-on neutral trim! Its amazing to me how
such a little movement had such a HUGE impact on the trim. No, aileron edge smooshing
necessary, by the way! Whew!
Best,
-
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 160+ Hours TTSN - Paint job is all that's left...
At 09:10 AM 3/31/2011 Thursday, Matt Dralle wrote:
>--> RV-List message posted by: Matt Dralle <dralle@matronics.com>
>
>
>Dear Listers,
>
>Well, taking the RV-8 in for paint is getting closer and closer and I'm trying
to get all the little things that need doing done before then. Dealing with
the heavy right wing is the next thing on the list. Currently, at low speed I
have about neutral aileron trim. The faster I go, the more LEFT trim I need.
Above 200mph, I run out of left trim and the left aileron is noticeably "up",
maybe .125" or so. Both of my ailerons are "chubby" at the trailing edge.
I wanted to confirm with the List that "squeezing" the RIGHT aileron will add
a bit of lift on the RIGHT side and hopefully neutralize the issue?
>
>Thanks!
>
>Matt
Message 5
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| Subject: | Re: Low RPM/High MP vs. High RPM/Low MP... |
Hum, interesting. In that graph, albeit for the IO-360, the "Limiting MP For Continuous
Ops" at 26 MP is 2100 RPM. 27 MP is 2200. Assuming the IO-390 is similar,
2150 at 26.5 ought to be good to go. BTW, I flew tonight and at 26/2150
I was seeing about 10.2-10.5 GPH @ 2500ft. Better than I recalled.
Where can I get a sweet chart like that for my IO-390? I looked quickly though
the manuals that came with the engine, and I didn't see one.
Thanks for the feedback everyone!
-
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 160+ Hours TTSN - Paint job is all that's left...
At 10:07 AM 3/31/2011 Thursday, you wrote:
>Matt,
>
>I don't have an IO390 but the manual for my IO360B shows that combination as outside
of the suggested area of continuous operation - yes it was a quick look
and I didn't purely run the numbers.
>
>I would guess that combination might be detonation-prone.
>
>YMMV - see if you can get the appropriate chart for the IO390. They are a bugger
to figure out too - but there are some guidelines.
>
>Ralph
>
>
>-----Original Message-----
>>From: Matt Dralle <dralle@matronics.com>
>>Sent: Mar 31, 2011 12:21 PM
>>To: rv-list@matronics.com, rv8-list@matronics.com, rv7-list@matronics.com
>>Subject: RV-List: Low RPM/High MP vs. High RPM/Low MP...
>>
>>--> RV-List message posted by: Matt Dralle <dralle@matronics.com>
>>
>>Dear Listers,
>>
>>With the IO-390 and Hartzell 72" CS on my RV-8, a combination of 2150 RPM and
25-26 MP gives me nice 200MPH True and about 10.5-10.8 GPH. These number are
down low, maybe 3000ft. Higher altitude gives lower GPHs. At 2150, the cockpit
is pretty quiet too.
>>
>>Increasing the RPM and Decreasing the MP doesn't really change the GPH that much,
but starts dropping the speed.
>>
>>In all configurations, I'm running LOP at about 1360 on the hottest cylinder.
Oil temps are about 178 F. Max MP at low altitude is about 28-29.
>>
>>Are there any issues running in a low-RPM, high-MP configuration as described
above?
>>
>>Thanks,
>>
>>-
>>Matt Dralle
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