GP Wagstaff Extra 300 with Wren Turboprop
 

Just to let you all now
i am building currently a Wren Turbo prop into the Wagstaff
extra 300 from Great Planes (arf)

why? their seems to be no good alternative to find a plane that can take the turboprop from wren ( i mean starting from scratch)
and use a budget 500 usd for the aircraft itself (no engine )
and completing it within 4 weeks

i flew the wagstaff for over 25 hours now and found that it is a very gentle plane
Very hard to break
and behaves in the air just great
good landing behaving
nice donor

now just to not make people mad and let the scale as is
i will leave off the main sponsors on the plane and will put experimental (real?)

why the turboprop?
well i have 2 of these wonderfull machines from Wren Turbines
1 is currently build into a Oracle Turbo Raven
this plane is 14 kilo,s empty

the wagstaff will weigh about 10 kilo,s fully fueled incl 2 liters of kero , battery,s , etc etc

now with the turbo prop i am expecting to get about 18 kilo,s of thrust
Wren has succesfully altered the combustion chamber a bit
making it VERY responsive on high rpm,s
it responds now like a gas engine on the higher rev,s of the prop
prop i will use will be a 22x10 or 22x12

i fitted allready the engine into the extra 300
and fits!
even the cowling fits original
main problems i will have are:

fueltank placement:

1 eather using wingbags
2 making 2 tanks on top of each other above the CG
3 maybe in the canopy??

Ram intake:

1 beneath the cowlling just before the main gear
2 thru the cowling using a tube (leaving it original)

i will keep you posted incl all the pictures untill i am done and you will see a video of its maiden flight

Regards Sandor

GP Wagstaff Extra 300 with Wren Turboprop
 

Sandor,

It sounds great, by all means, keep us posted.

GP Extra 300/Turboprop
 

Sandor,

Are you really serious about flying the Wagstaff Extra at 22 Lbs. (10 Kilos). It seems that most of these are flying at around 15 to 16 Lbs for a wing loading of 28 to 30 Oz. per Square foot.
22 Lbs. would give you a wing loading of around 42 Oz. per Sq. Ft.
All I can say is WOW, I'm sure glad you will be flying it and not me.
Best of Luck. :rolleyes: :rolleyes:

Re: GP Extra 300/Turboprop
 

yes i am serious
now the patty i own weights 8.1 kilo,s
and 10 fully fueled incl smoke
the engine itself is not the problem i got the same weight as a boat anchor zenoah 62 :D
the problem is the 6 cell,s 3300 sanyo,s for starting and fuelpump
i will leave out the smoke system
as for the wingload well we tested this patty untill the max it would still not break in mid air
we started with gentle settings on all the rudders but now we fly it fully on expo
i guess if no wind yes it will come in fast but then this is what we do it for right?
ill take the gamble and i am shure it will fly nicely...

GP Wagstaff Extra 300 with Wren Turboprop
 

mcu showing cooling down

GP Wagstaff Extra 300 with Wren Turboprop
 

i started allready
yesterday went testing to set the turboprop before putting it on the patty

here you see a picture of the turbo props mcu and gearbox controller displays this was during running engine idle:
first displays shows the turbine,s temp , pump power and rpm
lower display shows the prop rpm

GP Wagstaff Extra 300 with Wren Turboprop
 

engine running on stand me putting a foot down on the stand
and believe me we needed 2 people to hold the workmate
afterwards those 2 vans in the background smelled all of kerosene fumes :D

GP Wagstaff Extra 300 with Wren Turboprop
 

working on the patty
soaking it all with epoxy to stop fuel spilling on the balsa

GP Wagstaff Extra 300 with Wren Turboprop
 

made the hole for the turbine 100 mm

GP Wagstaff Extra 300 with Wren Turboprop
 

fitting the engine

GP Wagstaff Extra 300 with Wren Turboprop
 

again engine from top

GP Wagstaff Extra 300 with Wren Turboprop
 

engine as seen from inside it just fitted before where original the fueltank was

GP Wagstaff Extra 300 with Wren Turboprop
 

does this has to fit in there?(sorry mike i now you dont like to see it like this:D )

yes it does
but then more cleaned up

GP Wagstaff Extra 300 with Wren Turboprop
 

fitting the engine cover fits!!

GP Wagstaff Extra 300 with Wren Turboprop
 

old patty hanging up to dry
this is the daily patty with a 3w 48 engine

GP Wagstaff Extra 300 with Wren Turboprop
 

Sandor what's the specs on the turbo prop? What rpm will it spin a 22x8 prop? What the expected thrust in lbs or kilos? What the expected hp? Are any of these specs available or are you writing the book?

We missed you from the Patty Wagstaff thread and I was wondering what happened to you. Now we all know what you have been up to. I think it's great. The most exciting thing that happened to my Patty was that I went from a manual pull choke to a servo activated choke for my BME 50. :o The best of luck and I'll be following your experiment closely. Russ

GP Wagstaff Extra 300 with Wren Turboprop
 

It is looking good.
This has got to be awesome.

GP Wagstaff Extra 300 with Wren Turboprop
 

well as for the turboprop its a little hard to explain
the turbine itself runs up to 160000rpm wich it will turn a 22x12 upto
7500 rpm,s on static ,wich gives about 18 kilo,s of thrust (7HP)
so basicly i am revving down the turbine to about 140000 with a 22x10 wich will give me still 6500 rpm,s static
but i will use less fuel and will get a longer life on the barrings
all the specs are availeble from wren turbine ( wren-turbines.com)
i allready posted some time ago video,s from my Turbo Raven
look here to see it :
http://www.rcuniverse.com/showthread...ight=turboprop
or see them here directly:
here are a couple of video,s of the turbine

http://209.15.85.5/neelix/turbines/raven.wmv

i am the one with the sigarette in my mouth
wren saw this video an commented "where you starting with gas?" a well if it does not light i will for shure


as for writing the book well i spend hours and hours to set all up and getting used to the turboprop and spending even more hours to find out small problemss

GP Wagstaff Extra 300 with Wren Turboprop
 

Hi, I have just entered into this forum looking for information on suitable airframes for a wren turbo prop. I will follow your postings on the raven and extra with interest.
Tell me did you ever consider the Pilatus PC9 or a derivitive I think is called a T6-A Texan 11 , Canadian Harvard 11 or Tucano depending where you are.
I would like to find a plan or glass kit for around a 90" span model which should fit the turbo prop unit ok.
I considered useing my 90" Giles 202 to try it out in but would like something with a narrower cowl so as to get the exhaust nozzles far enough away from the cowl, they get pretty hot.

GP Wagstaff Extra 300 with Wren Turboprop
 

yes i did consider a lot of planes
the extra is the best arf i ever flew
thats why i am currently building this to get other people also to try with different setup,s
i am also planning for next year the new pilatus pc21
this must be the ultimate thing for the turboprop
for the exhaust dont worry! you can extend them untill you are outside the cowl

GP Wagstaff Extra 300 with Wren Turboprop
 

i fitted the exhausts today no problems at all enough space to fit them

GP Wagstaff Extra 300 with Wren Turboprop
 

another one
here you can see inside the exhaust i use these pipes to get the hot air outside of the cowling

GP Wagstaff Extra 300 with Wren Turboprop
 

and offcourse the engine needs to breath a lot!
so i attached the intake
part needed: spinner 120mm from graupner and cut it inhalf :D

GP Wagstaff Extra 300 with Wren Turboprop
 

another one from intake

GP Wagstaff Extra 300 with Wren Turboprop
 

What size propeler are you using and how many RPM?
Do youhave any video of the plane flying?