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Post  John Goddard Thu Feb 23, 2012 3:20 am

All of a sudden that sure start looks very small.
I've stuck a Medallion RC cylinder on it to throttle it.
I may have bung a Tee Dee top end on though.
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Post  John Goddard Fri Feb 24, 2012 2:30 am

Had to drill a couple drainage holes in the floor of the engine bay and battery compartment. Man these things are like modelling
whilst squirting Baby oil all over the place.

Not that I'd know about such things obviously
afro
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Post  nitroairplane Fri Feb 24, 2012 2:34 am

John Goddard wrote:Had to drill a couple drainage holes in the floor of the engine bay and battery compartment. Man these things are like modelling
whilst squirting Baby oil all over the place.

Not that I'd know about such things obviously
afro

Lol good one John cant wait for the maiden/re maiden!
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Post  John Goddard Fri Feb 24, 2012 6:11 am

What I'm thinking rhymes with clucking bell..
I realise that when I weighed O/T as a lekky it was sans lipo DOH!
I wondered why even though with the 049 it's lighter it seemed to weigh 'the same'..

So of course my pwr to weight calc was very wrong.

One things for sure at 33 watts per pound (new calculation) it ain't going to ROG and
I think a hand launch may just result in a 'gentle' full throttle sink......

Windfinder says tomorrow's now going to be almost calm so tomorrow's THE DAY .....

what do you guys reckon 5x3, 6x3 , 6x4 or even 4.5x4?

Very Happy
J
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Post  nitroairplane Fri Feb 24, 2012 7:04 am

6x3 I think!
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Post  Cribbs74 Fri Feb 24, 2012 5:27 pm

John Goddard wrote:What I'm thinking rhymes with clucking bell..
I realise that when I weighed O/T as a lekky it was sans lipo DOH!
I wondered why even though with the 049 it's lighter it seemed to weigh 'the same'..

So of course my pwr to weight calc was very wrong.

One things for sure at 33 watts per pound (new calculation) it ain't going to ROG and
I think a hand launch may just result in a 'gentle' full throttle sink......

Windfinder says tomorrow's now going to be almost calm so tomorrow's THE DAY .....

what do you guys reckon 5x3, 6x3 , 6x4 or even 4.5x4?

Very Happy J

Hope it flies well John. Take a few props to the field and see what works best!


Last edited by cribbs74 on Fri Feb 24, 2012 7:33 pm; edited 1 time in total
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Post  PV Pilot Fri Feb 24, 2012 6:56 pm

Balsa is a very fast sponge.

Same here, 6x3 is where I would start.

Good Luck John!
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Post  RknRusty Sat Feb 25, 2012 8:56 am

I always start with a 6x3 on an untested airplane. I have yet to wreck on a maiden flight. But of course it helps that my control liners are much easier to fly than you guys' R/C planes.

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Post  John Goddard Sat Feb 25, 2012 9:23 am

Gotta go to work for a few hours so i'll keep it brief.
https://www.youtube.com/watch?v=K2TySfboG_8

Is engine spinning 5x3 25(+ a smidgeonette of YS 30)% holding 17.3K sure start bottom end, 'ringed' medallion cylinder, std Head.

Couldn't be bothered to change prop but whacked a TeeDee head on
which bumped it up to 18+K.
In short it wouldn't rog, field hasn't been mown since October but a hand launch and she was away.
Flew 3 times in excess of 10 mins Fabulous.
No one else there at the field so no utube of flight sadly watch this space for a full report L8er.
lol!
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Post  John Goddard Sat Feb 25, 2012 1:51 pm

OK some stats just in case one of you Hero's find yourself in a similar situation.

The O/T has a 55 inch wingspan
With about 560 sq in wing area
AUW with fuel and trimming 735 grams (26.25 oz)
I reckon I got close to 35 watts per pound assuming my shurmedteed bastardisation was hitting 60W
With the shallowest of dives or really dips it would loop and rolls could be coaxed.
The final time I flew it, it almost got boring (17 mins) so I flew inverted to cut the fuel flow/no clunk.
At a push I may be able to loose another couple ounces/2 oz Dubro could be replaced with the soy sauce bottle
and 1500 mah could be swapped for much smaller.
Very Happy

I'm gonna try different permutations of different engines and props before messing around with tarnos and TeeDees.
As a note the 'tickover' was 9k
Watch this space
Finally I took a pick of 35Watts Per Pound next to another hack which has 280 WPP.

Please note which one had to be restrained GRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR

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Post  fit90 Sat Feb 25, 2012 2:23 pm

That's smart of you to keep the fire breather restrained like that. never know what could happen if it was allowed to run free.
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Post  John Goddard Sat Feb 25, 2012 2:38 pm

fit90 wrote:That's smart of you to keep the fire breather restrained like that. never know what could happen if it was allowed to run free.
Wink
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Post  John Goddard Tue Mar 20, 2012 11:44 am

Instead of doing it the sensible way and putting a larger engine in the Old Timer I'm going to strap a second engine on as well.
Watch this space......................

Airplane
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Post  nitroairplane Tue Mar 20, 2012 12:10 pm

John Goddard wrote:Instead of doing it the sensible way and putting a larger engine in the Old Timer I'm going to strap a second engine on as well.
Watch this space......................

Airplane
So it's gonna be a twin?
Btw I think I am gonna stop running GX25.
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Post  John Goddard Tue Mar 20, 2012 12:18 pm

nitroairplane wrote:
John Goddard wrote:Instead of doing it the sensible way and putting a larger engine in the Old Timer I'm going to strap a second engine on as well.
Watch this space......................

Airplane
So it's gonna be a twin?
Btw I think I am gonna stop running GX25.

Yep
+
Pourquoi?
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Post  nitroairplane Tue Mar 20, 2012 12:19 pm

Cool!
Because of what's in it.
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Post  John Goddard Tue Mar 20, 2012 12:31 pm

Anything in particular? Cos there's V nasties in all glow fuel.
I may try some of that Southern Model craft if I get to one of the shows this year.
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Post  nitroairplane Tue Mar 20, 2012 1:14 pm

No I don't care about being in contact with chemicals.
As far a I am concerned 1/2a engine should be run on castor oil, methanol and nitromethane ONLY.
GX 25 does be actually hae nitro in it, it has an "alternative"
So the 25/20/55 is not actually 20/25/55 but an equivelant with using nitro.
I neve tried southern model craft.
Got a contact for them?
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Post  John Goddard Tue Mar 20, 2012 2:18 pm

Doesn't sound right to me.
You sure you're not confusing their Sycol ignition
Improver?
J
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Post  John Goddard Tue Mar 20, 2012 2:20 pm

You haven't been drinking it have you?
lol!
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Post  nitroairplane Tue Mar 20, 2012 2:24 pm

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Post  nitroairplane Tue Mar 20, 2012 2:25 pm

No John I have not been drinking Smile
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Post  MiniatureAircraftFactory Sat Mar 24, 2012 9:02 am

What you need to do is ask model technics for a msds ( material safety data sheet ) for the GX25 and see exactly what is in it, they can not refuse you you have a right to a free one at any time if you have a bottle of the fuel

Its always best to get a container of pure nitromethane, gallon of methanol and a bottle of castor and mix your own, then you can mix the correct amount of anything you want in your fuel , theres no need for anything else but there are loads of things you can put in for extra performance, you can find loads by searching control line team race sites for fuel info

I find , 30% nitro 25% castor 45%methanol works great , much better than GX25, runs cooler, more rpm, more power, more oil for longer life
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Post  John Goddard Mon Mar 26, 2012 5:12 am

MiniatureAircraftFactory wrote:What you need to do is ask model technics for a msds ( material safety data sheet ) for the GX25 and see exactly what is in it, they can not refuse you you have a right to a free one at any time if you have a bottle of the fuel

Its always best to get a container of pure nitromethane, gallon of methanol and a bottle of castor and mix your own, then you can mix the correct amount of anything you want in your fuel , theres no need for anything else but there are loads of things you can put in for extra performance, you can find loads by searching control line team race sites for fuel info

I find , 30% nitro 25% castor 45%methanol works great , much better than GX25, runs cooler, more rpm, more power, more oil for longer life

Where do you get your Nitro from Will?
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Post  John Goddard Mon Mar 26, 2012 5:31 am

Hot off the press the I've discovered the 'Old Timer' is a Multiplex (another 'awful' German Co) Hummel.






A great shame that the first 12 minute flight where the engine was happy to hold 19.7K and was looping from the flat
didn't get filmed, but camera 'operator' has now been sacked/you can't get the staff these days.
These 2 flights engine was running less than ideally shall we say but I couldn't be bothered to faff around with it.
Probably dirt under reed or air leak.

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