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frans(at)privatepilots.nl
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 Posted: Wed May 12, 2010 9:25 am Post subject: PH-DIY performance data |
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A few days ago we recorded some performance data. Air was not entirely
smooth, so speed may be off a few knots.
The cowl flap made a very noticable difference. Also, we got some rain,
and it seems that it cuts a few knots off the speed.
The data below was recorded with the cowl flap in cruise setting (almost
closed) and with dry wings. Airplane (Hi-top Tri gear) was a bit over
MTOW. Power plant is a Rotax 914 coupled to a Woodcomp high twist
2-blade SR3000/W.
I think the fuel consumption is a bit on the high side, what do you
think? (Fuel flow has not been calibrated, sensors were used with
factory calibration, but seems to roughly match with refueling data).
Also, some people later commented that it is better to have a higher RPM
for the Rotax and lower MAP's, any comments on this?
MAP 27, RPM 4500: IAS 121, Fuel flow 15,5 L/h
MAP 29, RPM 4800: IAS 134, Fuel flow 19,7 L/h
MAP 31, RPM 5000: IAS 145, Fuel flow 24,0 L/h
How does this compare?
Any other MAP/RPM combinations I should try?
Frans
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davidjoyce(at)doctors.org
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| Posted: Wed May 12, 2010 9:49 am Post subject: PH-DIY performance data |
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Frans, For what it's worth my 914 Xs/normal top/mono + speed kit/ Woodcomp
SR3000W/3blade does the following at >90%MaxAUW at 2000ft:
TAS 120 Kts 14 l/hr
,, 130 ,, 19 ,,
,, 140 ,, 23 ,,
We have found on many trips that extra wheels don't help, but your figures
are pretty close to mine even so, assuming your ASI reads correctly
Regards, David Joyce, G-XSDJ
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frans(at)privatepilots.nl
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| Posted: Wed May 12, 2010 11:02 am Post subject: PH-DIY performance data |
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On 05/12/2010 07:47 PM, David Joyce wrote:
| Quote: | Frans, For what it's worth my 914 Xs/normal top/mono + speed kit/
Woodcomp SR3000W/3blade does the following at >90%MaxAUW at 2000ft:
TAS 120 Kts 14 l/hr
,, 130 ,, 19 ,,
,, 140 ,, 23 ,,
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Is this TAS indeed? My data was based on IAS. At 2000 feet I can add
about 4 knots to my speeds to get TAS.
Anyway, then my fuel consumption doesn't seem to be that high, I assume
this will improve a bit once the engine has been fully run in.
(Operating temperatures are still dropping, so I assume it is still
getting rid of excess friction).
| Quote: | We have found on many trips that extra wheels don't help,
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That's why I decided to get rid of one wheel, I'm happy with only three
wheels. 
| Quote: | figures are pretty close to mine even so, assuming your ASI reads correctly
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The ASI has been calibrated (mandatory) and was found to be correct to 1
knot over the entire range. The backup ASI (with separate pitot) agrees
with the primary ASI.
Do you recall what RPM and MAP settings you normally use?
Thanks,
Frans
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davidjoyce(at)doctors.org
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| Posted: Thu May 13, 2010 12:49 am Post subject: PH-DIY performance data |
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Frans I generally fly at around 5000rpm but for that exercise I think I
followed the Rotax table for RPM/MAP settings. David
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