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Homepage of Theo Volkers
This homepage presents:
-
model aircraft software: simulation
of F3B Launch and speed task
-
model aircraft software: simplified
F3K launch simulation
-
an
article titled: "Aerodynamics of a DLG unravelled"
-
a copy of Memorandum M-276 titled
"Preliminary results of windtunnel measurements on some airfoil
sections at Reynoldsnumbers between 60,000 and 500,000"
- a
copy of an article written for Flug + modell-technik:
"Windkanalvermessung der Eppler Profile E 385 und E 387"
-
some interesting
links, photographs and sink rate analysis which highlight my
hobby
Analysis of the F3B Launch and Speed task
Software: F3B launch and
speed task
This
sottware is embedded in an excel file and written in a VBA macro. It is
written almost 20 years ago. At that time the results matched the
actual performance. At present it still gives insight in the effect of
variations of the input parameters.
Analysis of the F3K Launch
Software: F3K
simplified launch simulation
This software is a
simplified launch simulation of a DLG model. It is embedded in
an excel file and written in a VBA macro. It can
be used to get insight in the effect of change of mass, minimum air
drag and release speed on end height.
Article: "Aerodynamics
of a DLG unravelled"
PDF
file with said article
An article written for "Flug +
modell-technik" Feb. 1980
with help from L.
Boermans and interview with W. Thies (in German language)
Copy of Memorandum M-276.
Memorandum
M-276
This is a preliminary
report on wind tunnel measurements performed
during my
study on some airfoils that were popular around 1977.
The final
report has never been finished, but the pictures in the report speak
for
themselves for all people who are interested in airfoil characteristics.
Measured Eppler 387
airfoil characteristics from Memorandum M-276
Comparison of XFOIL
(default settings) computations with measurements from memorandum M-276
Some interesting links related to RC
models
Homepage of De Starthaak
Photographs which highlight my hobby
Start of the F3b Cobra
Landing of the Cobra
Nico van de Burg and Theo Volkers launching the ZEFIER
and three proud builders
of their team design "Zefier", in memory of Gerrit Versteeg
Alsema Sagitta, 4m span
F3J NAN Explorer1, 3.5m, converted to F5J; the orange one far right on
the groupsphoto 2014 F5Jcontest Deventer
Launch of my Explorer
Fokker DVII
Tiger fleet of Ornithos winterproject
Sink
rate Analyses for Stream NXT and Nan Xplorer1
Computed Sinkrate Stream NXT, based on
XFOIL
analysis on measured wing sections at 1, 34 and 65cm span
and estimated parasitic drag.
Corrected version published on 17 June
2020
Computed Sinkrate NAN Explorer1, based
on XFOIL and analysis on measured Mid section
and estimated
parasitic drag.
My F5J (former F3J), 3.5m span Explorer
from 2006 has
a
mass of 2.4kg. Current F5J Explorers weigh only half this value.
Email
Theo Volkers for
questions or comment
Last update
January 21, 2021
