JoeEagle

My Feedback: (26)

that is awesome mec.

so, you can then put 4 blades in if you wish.

i'll have to contact them. thanks for sharing this information

Spaceclam

let me know when they come out with a 15-17 size.

robert

Just remembered about this thread. It must be ready for another summer mec?

digitech

My Feedback: (10)

ok i will start

here is our new Pilatus PC-6 B2-H4

span 3.20 meters
weight 18 kilo,s
Engine : Wren-Turbo prop MW-54 (previous was on the GP extra)
specs:
4 liters kero
250ml oil for transmission
all up 8311 jr digital servo,s
the pictures:
in the end a "bigger" porter












Regards Sandor

Forgues Research

My Feedback: (7)

WOW

mec

hi robert,

yes, my turbo cap is still alive.
in the meantime we tested different props, made from carbon fibre and/or wood. in addition to this a few turbine internal updates arrived. all in all the increase of power output is minor, particular because in reving up the prop to higher rpms, the pitch prop mechanism comes to its limits. centrifugal forces are exploding as well as much more power of the pitch servo is demanded.

i am waiting till anyone outthere will try to use a fully variable pitch prop on his turbo plane. hey, sandor, would you be so kind to go this way? i am standing alone, there are some minor problems to be sorted out, and believe me, the full adjustable pitch prop offers a large range of possibilities, either for short "on the spot" landings or impressive aerobatics.

when i get a call from PJW, that there are good news i.g. more revs, more power, i will try again torque rolling the plane, my last goal for this plane.

in the meantime i practice TR with my Rhapsody, Funtana or Shochflyer

mec

Spaceclam

Funky

digitech

My Feedback: (10)

no problem how much is jadakowsky charging for this part?
i cant find anything on his page
i would try it why not
i use now every prop between 22x10 and 26x10 and still fly,s
but it would be cool to park backwards

mec

price for the pitch prop: please send an email to [email protected]

there are two things to mention:
# have you thought of the fact, that the pitch prop will need a completely different ECU (cause of the accurate rev alterations)?
# the revs that you are going on your unit will probably make explode the pitch prop unit. so you will be something like a pioneer or developer!

your pilatus project is impressive, wow!

mec

digitech

My Feedback: (10)

our unit uses 2 ecu,s one is for engine one is for powerturbine rpm,s
i have got a perfectly working rev control i can set it up to run from 1000 rpm,s to 12000 rpm,s
so if i would set the unit to 8000 rpm,s i would be ok in all cases

digitech

My Feedback: (10)

hi mec ok i got a reply
eather they dont want to sell me one witch i think they do
or it just wont hold the hp,s from the wren
read this:

----- Original Message -----
From: Digitech Electronics
To: [email protected]
Sent: Monday, June 14, 2004 10:48 AM
Subject: pitch prop

Hi i would like to know how much are you charging for this unit? (pitch prop)
I have got a wren engine it has a shaft of 6mm so it can fit now any prop
The max torque is about at 6500-7000 rpm on the shaft
It is for a pilatus pc-6 spinner would be 90-95mm
Props I use vary from 22x10 up to 26x10
The best performance I have at 22x12 mentz prop 8000 rpm,s

Best Regards,

Sandor Kruise

Digitech Electronics B.V
Oliemolenstraat 5
6343PW Klimmen
Netherlands
Tel:+31454059000
Fax+31454059001
www.digitech.nl
[email protected]
Bank:Rabobank
account:125915896
Swift:RABONL2U
Iban:NL73RABO0125915896

the reply:


Van: RD technotrade Gmbh [mailto:[email protected]]
Verzonden: maandag 14 juni 2004 11:21
Aan: Digitech Electronics
Onderwerp: Re: pitch prop

Hello,

sorry our prop-unit is only with an PJ-W-R or Limited Edition Turbine obtainable.
Because it is made for this engine.

Best regards
René Dusl
---------------------------------

typical answer from a engineer,s point of view but not buisiness
to bad .............

digitech

My Feedback: (10)

ok i tryed again:

-----------------------------------------


Original Message -----
From: Digitech Electronics
To: 'RD technotrade Gmbh'
Sent: Monday, June 14, 2004 11:50 AM
Subject: RE: pitch prop

Ok lets try again:

I need a pitch prop unit that you exlusive sell for your turboprop engine

How much is it?



Best Regards,

Sandor Kruise

------------------------------




answer:

Hello !

Sorry we don´t sell the prop-unit without turbine.

Best regards
René Dusl
----- Original Message -----
From: Digitech Electronics
To: 'RD technotrade Gmbh'
Sent: Monday, June 14, 2004 11:50 AM
Subject: RE: pitch prop

digitech

My Feedback: (10)

pfff i give allready up for this pitch prop unit
i think our germans are better then your germans (quote:the right stuff)

i flew the pilatus yesterday take off weight was 21 kilo,s (about 3 liters of fuel included) so i guess we where a little
wrong on the weight
it needed about 10 meters (33feet) and went airborne without flaps
extremely fast acceleration
landing was impressive , about 10% flaps it was a little fast but we landed within 90 meters
i guess we do it reversed since the original needs less space to land then actualy taking off
this was just the first flight , so we need to get used to the plane and next time keep the rpm,s up and pull
more flaps
we just wanted to be safe since we want to fly this pilatus at lots of event,s this year in germany , belgium , and the netherlands
anyway we will fly it again soon and i will make a video

mec

congrats to your maiden flight.

pitch prop: the unit we use will not withstand 8000rpms. the centrifugal forces will destroy the mechanism, bearings, junction between blade and bladeholders. the risk of injuries should not be neglected.

seems that there will be a "do it yourself prop unit" way only for you. see my photos and drawings in my previous posts.
how about that?
to do this is no miracle. all it needs is a simple mill and lathe, thats all.

mec

digitech

My Feedback: (10)

there you go you see a problem allready
i dont own a lathe or mill
i service and build turbines , i own a impressive balancing machine (schenk computerised)
a spot welder to weld any metal down to 0.075
i have the biggest festo collection fuel cluncks etc etc
i sell turbines anything from 5 to 16+ kilo,s
however i am to stupid to make myself a pitch control unit
simply i dont have the time to invest in it , and i am not a metal man
thrust pipe,s i can make they even give more thrust then the turbine itself!
so i am better of paying someone to sell this item to me
but i doubt if anyone could build one that can handle the power of the wren turboprop
for now we got used to the what you call it turbine spool up time
but as i sayd in the past the real power is within 75-100% turbine power
this means it is less then a second to handle this power
so we did mentioned to hang on the prop for about 20 seconds
the real problem is we try it at to much altitude to be safe
so hearing the turbine and feeling the power on the stick is a problem
but we fly the raven now for almost the 3rd season
i has crashed , flamed out etc etc
after this time we finaly found the best setup the best fuel system around
and i have trown out the so called u.a.t
this thing even caused a flame out
did you ever figure out what the uat is made of?
i just found out from a friend of mine , and as always : why didnt i think of this?

digitech

My Feedback: (10)

anyway mec i send them a last email (jadakowsky)
but it seems they would not reply anymore
to bad would be cool to see what this thing could do...............
here is the mail

it seems they never have a laugh overthere
i kinda like the englisch better....
anyway this is my humor


Van: Digitech Electronics [mailto:[email protected]]
Verzonden: maandag 14 juni 2004 12:18
Aan: 'RD technotrade Gmbh'
Onderwerp: RE: pitch prop

So basicly you are telling me:

Dear sandor
Because you have a wren engine you cant have our pitch controlled prop
So eather you buy a whole unit , or leave us alone we got work to do.

Would that be accurate??

Best Regards,

Sandor Kruise

mec

i can follow all of your arguments. all is clear.

one thing i want to mention: the hard way to go for a variable pitch prop is worth all the time and money you spent. it opens an enormous range of new perspectives.

seems that you need to cooperate with a "metal man".

PJW:
they know, that this unit is designed for approx 6000rpm (according to the gear used in the PJW), and it is suspected that it will fail at much more rpms. thats why they do not sell it for your purpose (safety reasons and it will safe your money). i think, when i would ask peter jak, it would not be a great problem to get one of this variable PP (for you). but i think too, this unit is not adequate for your motor. you need a complete new design, matched and fitted to your own demands.

mec

gooniac33

I am very new to this site so please bear with me if I have mentioned something that has already been said.

First off you plane is beautiful!!!! Very nice paint scheme!!! And an R/C turbo prop is by far the coolest thing I have seen in our hobby having been involved with R/C planes for the last 16 years. Great Job!!!


Second. I was wondering whether you have gotten the problem solved with the hovering? If not I had a suggestion. People have told me that if a plane has plenty of forward speed and not enough vertical performance you need to increase the diameter and decrease the pitch. In other words you should increase the diameter of your prop and when you go vertical increase the prop speed and decrease the pitch? Full scale planes use the lower pitch settings for the most thrust on take off and then use higher pitch and lower RPM's for cruising. I don't know if this is at all possible with you application or not but I thought I would throw that at you and see what you think.

thefasttrack

are you still ther mec i wanna to seea pic of it

robert

Any word on the model these days?

EddieWeeks

Hey Mec... Here is a VPP setup for 10hp...

it looks more than strong for any turbo-prop

http://www.variablepitchhobbies.com/