# Some questions: What kind of tip-to-tower distance do you have?
'The original' six blade machine
in the picture has got really rigid blades
and does have quite big tip-to-tower distance.
I might get that knowledge
from Kyösti Juvonen,
who is taking care of that machine.
(There was a small mistake above,
The wind rotor is 7,5 m diameter, not 6,5 m)
The one we built with Taisto Suihkonen
has got the blade a bit tilted
and about 60 cm
distance.
That blade is also very rigid.
The new one with Erkki Nousiainen
(10 m diameter) is going to be
fixed on a downwind turbine,
where if the blade happens
to become a bit flexible,
it cannot hit the tower.
# How much do the blades
flex in high winds ?
With six blade and the four blade
the blades flex really little.
We will see, how it will go
with the new big one.
# What kind of furling mechanism
does that machine use ?
The six blade has got
no furling mechanism.
The generator there
is a bit oversized
and there is an electric
control mechanism
to add more load,
the more power there
is available.
The machine has been
in use more than
ten years and survived some storms,
so that one has been
successful without any
furling systems.
The four blade machine with
Taisto Suihkonen has
got a similar furling system
as used by Hugh Piggott
and with the later 'OP' projects.
The new project (10 m) is going to
be installed on an old wind turbine
with a pitch control mechanism,
which might not to be used at this time...
But we will see, we can use the
pitch control mechanism also,
if it will seem to be desirable.
# What kind of RPM are you
achieving in what kind of windspeed ?
(a tricky way of asking what your TSR is)
on the 'Reinikainen' machine ?
I will ask Kyösti Juvonen,
who is taking care of the 6 blade machine.
He might know about that.
With Taisto's machine it has
never been measured, yet.
I'm hoping that we'll achieve
with the new one TSR 4-5.
# What do you cover your blades with,
and how do you stop them from delaminating ?
With Taisto's machine
the blades were soaked
with linseed oil as much as the wood
would take in. On the top
there is an oil paint coating.
On the tips there is fiberglass
resin also.
With the six blade machine there
is a paint coating and
fiber glass resin on the tips.
With the new 10 m diameter
project it depends on Erkki.
He told that he might first
test them without any coating
and might use tar with them,
when got them running well.
He has got long experiences
working with wooden projects.
His first wind pump was built
in the beginning of 1950's...
He knows about many traditional
wood protection methods.
We will see, what he will do for it.
# Do you have a powercurve ?
If so can I see it ?
It might be available
from Kyösti for the six blade machine.
I will ask from him.
With Taisto's machine it has never
been measured, yet.
- Hannu