Show us Your RV

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Ugly Duckling
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Re: Show us Your RV

Unread post by Ugly Duckling » Wed Mar 04, 2009 9:34 pm

:D Any idea what they are looking for :?:
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Re: Show us Your RV

Unread post by George » Wed Mar 04, 2009 9:47 pm

Break line leak?
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Re: Show us Your RV

Unread post by Ugly Duckling » Wed Mar 04, 2009 9:51 pm

Dunno either :D But the "Gatkant" was too good to miss :lol:
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Re: Show us Your RV

Unread post by WABez » Wed Mar 04, 2009 11:47 pm

Ugly Duckling wrote::D Any idea what they are looking for :?:
RV...


Serious, dunno what they look there for, the air intake is blocked! :twisted:
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Re: Show us Your RV

Unread post by RudiGreyling » Thu Mar 05, 2009 5:11 pm

Duckling your a Bl!ksem :twisted:
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Re: Show us Your RV

Unread post by Alan stewart » Tue Mar 24, 2009 3:38 pm

About cruise speed. My RV9 160hp fuel injected fixed pitch prop 145knots 2300rpm burning 30/31 ltr/hr.
I am quite happy with this
If i try to go any faster i just burn fuel for quite a small increase in air speed.

Flat out not to sure been to 165 and also on my test flight in FACT 195knots ground speed but OK there was a 30 knot or so tail wind

For me NOt all about speed , yes it is nice but not THE most important.


Enjoy

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Jan
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Re: Show us Your RV

Unread post by Jan » Tue Mar 24, 2009 9:00 pm

Hi Alan.
Looking at your fuel burn - are you running ROP?
It seems like that as the fuel burn looks a little bit too high.
I would say you should get it down to 25 lph if you run it LOP.
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Rob K
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Re: Show us Your RV

Unread post by Rob K » Tue Mar 24, 2009 9:15 pm

Hey Jan,

You raise an interesting debate - alweer :D :D :D

I have been flying LOP for some time and since I got the RV have heard horror stories about glazed cylinders etc.

I was told to run the IO 360 at approx 50 degrees ROP which gives me around 30 litres per hour.

Wat se jy?

Rob
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Jan
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Re: Show us Your RV

Unread post by Jan » Tue Mar 24, 2009 9:53 pm

Yes I know there are two schools of thought here. A well known RV man in SA ( maybe the best known of all ) who just happens to be an engineer as well told us to run LOP. As RVs are generally "cowled" for speed, they tend to run slightly hot.

So if you have an injected motor and a proper engine monitor, run it LOP. Your fuel burn will come down somewhat and your CHTs will come down by about 30F.

Over 250 hours that we have been flying JAD now the average cruise speed is 155kts at a fuel burn of 27lph. That is on an IO-360.

As they say - it it works I will take the honour. If not.............
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Rob K
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Re: Show us Your RV

Unread post by Rob K » Tue Mar 24, 2009 10:27 pm

Jan wrote:Yes I know there are two schools of thought here. A well known RV man in SA ( maybe the best known of all ) who just happens to be an engineer as well told us to run LOP. As RVs are generally "cowled" for speed, they tend to run slightly hot.

So if you have an injected motor and a proper engine monitor, run it LOP. Your fuel burn will come down somewhat and your CHTs will come down by about 30F.

Over 250 hours that we have been flying JAD now the average cruise speed is 155kts at a fuel burn of 27lph. That is on an IO-360.

As they say - it it works I will take the honour. If not.............
Thanks Jan,

Will CHT's go down?
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Re: Show us Your RV

Unread post by George » Tue Mar 24, 2009 11:02 pm

I don't have the fancy smancy engine monitor. I run the Meercat at 8.5 gals/hr, around 1500 egt and between 370 and 400 CHT. During summer and extended climbs it goes above 400 for periods. Speeds are slightly better than those reported above, but maybe PTAR police are monitoring it, so lets say 170kts :^o :^o :^o :^o :^o :^o in the cruise. It now 500+hrs and avg consumption is around 28l/hr. I usually fly at FL75/85/95 with odd 100ft AGL navex thrown in. Low level it runs hotter and burns more. Above FL095 it runs significantly cooler (close to 350, 1475 at less than 8gal/hr) while ground speed around 180kts....

At PTAR last year we got 27inches (never seen before) at stages but fuel burn went as high as 12.5 gals/hr, which brings range down to just over 2.5 hrs :shock: :shock: :shock: :shock: .

:oops: :oops: :oops: :oops: :oops:
I have never run the Meercat at less than balls to the wall. It was bought as a commuter and the fuel burn difference between 2700 rpm @ 23inches and lesser settings is marginal. Blow bye's have been good on the 5 MPI's I have had
:oops: :oops: :oops: :oops:
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Re: Show us Your RV

Unread post by Rob K » Wed Mar 25, 2009 7:00 am

George wrote:I don't have the fancy smancy engine monitor. I run the Meercat at 8.5 gals/hr, around 1500 egt and between 370 and 400 CHT. During summer and extended climbs it goes above 400 for periods. Speeds are slightly better than those reported above, but maybe PTAR police are monitoring it, so lets say 170kts :^o :^o :^o :^o :^o :^o in the cruise. It now 500+hrs and avg consumption is around 28l/hr. I usually fly at FL75/85/95 with odd 100ft AGL navex thrown in. Low level it runs hotter and burns more. Above FL095 it runs significantly cooler (close to 350, 1475 at less than 8gal/hr) while ground speed around 180kts....

At PTAR last year we got 27inches (never seen before) at stages but fuel burn went as high as 12.5 gals/hr, which brings range down to just over 2.5 hrs :shock: :shock: :shock: :shock: .

:oops: :oops: :oops: :oops: :oops:
I have never run the Meercat at less than balls to the wall. It was bought as a commuter and the fuel burn difference between 2700 rpm @ 23inches and lesser settings is marginal. Blow bye's have been good on the 5 MPI's I have had
:oops: :oops: :oops: :oops:
Hi George,

Thanks for the input.

500+ hours says it all.

The figures you quote sound significantly LOP and you dont seem to have had any issues - (I assume an IO360?)

The 8.5 g/h (32,5 l/h) makes sense as does the 28 l/h ave with the extended higher altitude cruising you do.

I need to do a long high altitude run in the RV to confirm.

Also not yet seeing the speeds you getting :-({|= :-({|= :-({|= :-k :-k :-k Max so far around 162 Kts (GS)

Off to Friedrichshafen for 2 weeks so will have to wait till I 'm back.

Looking forward to the get-together.

Regards,

Rob
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Re: Show us Your RV

Unread post by Alan stewart » Wed Mar 25, 2009 12:05 pm

WOW how to start a debate .ok i run ROP as the book says +/- 50F in the cruise and about 100F if i am at high rpm .
i have read so much about this and really not to sure what is the correct solution.
have all probes CHT and EGT but still not 100% happy to run LOP.
I must confess that i am after 160 hours still struggling to get the oil temp below 210f and only in the last 10 hours and 3 vernotherm(spelling???) valves does it seem that the oil is now around 195f,and endless oil pressure ajustments(oil pressure was way to low so i have been very slowly increasing to get 83 cold and 68 hot and i think still a little low), so maybe i will now try LOP but very carefully.

So my2C.

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Jan
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Re: Show us Your RV

Unread post by Jan » Wed Mar 25, 2009 6:58 pm

Alan,
As I see this your engine is one big piece of aluminium heatsink. So if the CHTs are running hot, the oil temp will follow it in a few minutes.
So just try 15 minutes running LOP and then see where your oil temp goes. I am almost 100% sure that you will see a big drop.
15 minutes of running will surely not damage your engine. Then myself and George and Deon and many others would have made forced lobs long ago.
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Re: Show us Your RV

Unread post by Steve » Thu Mar 26, 2009 7:36 pm

Another pic taken last week :)
RV4.jpg
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