Kingsley,
FWIW, my XS Trigear conversion with 914, Airmaster 332 straight blades, has been
doing 110 kts indicated. This is a bit lower than the 114 kts indicated GPS
speed. This is at 5000 RPM, 26.5" MP & 4.5 GPH (17 LPH) with no fairings at
all.
Last week I put the wheel pants on and that same power/fuel setting produced 115
kts indicated (120 kts GPS speed).
I'm working on the gear leg fairings this week. I'll let you know what it does
when they are on and I have a chance to fly it.
Eventually, the rest of the speed kit (flap hinge fairings) will go on and we'll
see how that helps.
Blue skies & tailwinds,
Bob Borger
Europa XS Tri, Rotax 914, Airmaster C/S Prop.
Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger@mac.com
On May 20, 2013, at 7:09 PM, Kingsley Hurst <kingsnjan@westnet.com.au> wrote:
Gentlemen,
When you quote the speed of your aircraft, please clarify if you are talking
IAS,
CAS or TAS.
The 914 Mono I am now flying has the pitot and static vents in their original
positions.
i.e. pitot forward of the spar and static holes on the side of the fuselage.
I have always suspected the IAS to be under reading and flying in formation with
a Virus Motor Glider at different speeds confirmed this was so albeit I equally
suspect the ASI on the Virus is optimistic to some extent.
In flight at or close to AUW with Warp Drive square blade prop, at 9500 ft, 5000
RPM and 29" MAP, 20 LPH fuel burn, I am getting 118-120 IAS which is around
135kts TAS.
I am interested to know how these figures compare with others please.
Regards
Kingsley in Oz.
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