Barton Model Flying Club

Items wanted :: RE: F86 Sabre

Hell Razor — Tue, 19 Aug 2008 19:27:41 GMT

Author: Hell Razor
Posted: Tue Aug 19, 2008 7:27 pm (GMT 0)

Hi Nev,

Why not build a Doodle Bug? That way if you hit the ground during the first flight, no one can say it wasn't intended

On a slightly more serious note, the Heinkel He162 Salamander would make a good scale model to start with. No enclosed Jet engine to burn up all your hard work!

As to the F86 kit, i'm afraid i don't know who made it.. someone will remember. It's probably an American kit from some time ago.

My Phire Phart is really easy to fly now so the offer still stands if you would like to have a go with a Jet

Hell Razor

Aerobatics :: RE: Old Time Stunt, Spark ignition too(retired!)

Glen A — Tue, 19 Aug 2008 18:49:23 GMT

Author: Glen A
Posted: Tue Aug 19, 2008 6:49 pm (GMT 0)

Hello,
I have been trying to fly a vintage stunt Moitle with a Rustler Frog 500 on spark ignition. My main problem is getting the engine to start on spark. (it runs fine as a glow). The plug seems to oil up almost instantly and drowns the spark. I am using a transistor system and normal glow fuel. I must admit I have not tried petrol yet as I was advised that glow fuel would be fine and might even give more power. I would be grateful if you could give any advice on spark gap and timing settings etc.

Glen Alison

General :: RE: 2008 WORLDs

ExRAFbod — Tue, 19 Aug 2008 18:19:52 GMT

Author: ExRAFbod
Posted: Tue Aug 19, 2008 6:19 pm (GMT 0)

Those were Ewoks.
_________________
Per Ardua disAstra

General :: RE: 2008 WORLDs

strangepork — Tue, 19 Aug 2008 18:17:01 GMT

Author: strangepork
Posted: Tue Aug 19, 2008 6:17 pm (GMT 0)

He may own a diamond mine but he's not as cuddly as big jim, what were those little hairy cute things in star wars?

General :: RE: 2008 WORLDs

strangepork — Tue, 19 Aug 2008 18:16:18 GMT

Author: strangepork
Posted: Tue Aug 19, 2008 6:16 pm (GMT 0)

He may own a diamond mine but he's not as cuddly as big jim, what were those little hairy cute things in star wars?

Items wanted :: F86 Sabre

Nev Eyre — Tue, 19 Aug 2008 18:05:53 GMT

Author: Nev Eyre
Subject: F86 Sabre
Posted: Tue Aug 19, 2008 6:05 pm (GMT 0)

Hi Guys,
A couple of years ago [ might have been 3 ?]at the Nat's, someone bought a stamped metal kit of a C/L Sabre, for use with a Dynajet..... I saw it disapearing out of the hangar during the swapmeet.......... was it anyone on this Forum, did it ever get used... if not, is it up for sale ?
I have a Dynajet I want to fly, but not as quickly as Richard [Hellrazor ] does, so a scale model would be a laugh ?
Any leads ?
Cheers,
Nev.

General :: RE: Engine ' Run Away ' ..... WHY ?

admin — Tue, 19 Aug 2008 17:11:27 GMT

Author: admin
Posted: Tue Aug 19, 2008 5:11 pm (GMT 0)

Totally agreed.
The move to 2 stroke and staying there is usually down to the motor getting very hot.
In addition to the increase in oil content another thing to look at is the cowl opening size and just as important the exit. Make sure that there is adequate air passing over the motor by making the air inlet/outlets as large as you can without spoiling appearance.

Jim
_________________
Model Ship World

F2 World Cup - Barton 2008

General :: RE: Engine ' Run Away ' ..... WHY ?

ExRAFbod — Tue, 19 Aug 2008 14:50:59 GMT

Author: ExRAFbod
Posted: Tue Aug 19, 2008 2:50 pm (GMT 0)

An OS 46LA was known to runaway after about 100 flights. The fuel used
consistently was 10Nitro, 23 Total Oil 11.5% Castor, 11.5% Synthetic. I exchanged the fuel used immediately to allay complaints in that direction. Noticing that there were significant oil deposits building, the owner as questioned. He hadn't cleaned the engine since installing it from new and had 'adjusted' the compression in the head (forget precisely what was done) to raise it a little.

I do believe a number of things combine together to cause runaways but the main initiator I think is heat buildup or corrollary - lack of cooling. I have seen engines tamed by adding more shims to reduce compression and switching props to change the load etc then even monkeying with the fuel at times.

It is perhaps key to accurately diagnose what's going on with a runaway if you keep a log of how the engine runs over time i.e.: since new.
My money's on lack of cooling and internal tolerances being changed by gunk buildup.
_________________
Per Ardua disAstra

General :: RE: Engine ' Run Away ' ..... WHY ?

downunder — Tue, 19 Aug 2008 14:45:30 GMT

Author: downunder
Posted: Tue Aug 19, 2008 2:45 pm (GMT 0)

My G51 CL version initially had a very bad "run away" when it broke into a 2 stroke and would take about 2 laps to finally settle back into a 4 stroke. I played with every variable for about a month before I accidentally found the problem. One day I ran out of my usual true FAI fuel so as a last flight for the day I filled with some 75/25 fuel I happened to have with me. It held a powerful growling 4 stroke the entire flight and I've never touched it since. The light dawned on me quite some time later. The engine is extremely economical and 20% oil didn't give enough flow of oil through it so it was overheating.

RC style porting though is a different animal because their torque curve peaks at much higher revs than is usual for CL stunt engines. If they pick up some revs by leaning out a little (or breaking into a 2 stroke) they develop more torque which allows them to gain more revs which lets them develop more torque which....

Aerobatics :: RE: Starting point

Ray Lloyd — Tue, 19 Aug 2008 11:26:07 GMT

Author: Ray Lloyd
Subject: handle
Posted: Tue Aug 19, 2008 11:26 am (GMT 0)

I suppose realy the starting point is the handle and below is mine, designed by me it is fully ajustable in flight for line length and line spacing but CofG must be in the correct place on the model to start with.

Ray
_________________
Flying stunt for 56 years, still not got it right

General :: Tiger Major

rustler — Tue, 19 Aug 2008 10:50:05 GMT

Author: rustler
Subject: Tiger Major
Posted: Tue Aug 19, 2008 10:50 am (GMT 0)

See today's post in engine talk. Differences between Mk.'s 1 and 2.
_________________
Ian Russell

Engine Talk :: RE: Tiger Major

rustler — Tue, 19 Aug 2008 10:48:14 GMT

Author: rustler
Posted: Tue Aug 19, 2008 10:48 am (GMT 0)

Someone must know? - Anybody?
_________________
Ian Russell

Aerobatics :: RE: Starting point

Ray Lloyd — Tue, 19 Aug 2008 10:32:02 GMT

Author: Ray Lloyd
Subject: starting point
Posted: Tue Aug 19, 2008 10:32 am (GMT 0)

A good full fuselage model to start on would be the Randy Smith Vector and from that move to the SV 11/12.
Just my humble opinion.
I flew one of Jim's Stiletto 500's with a Merco 35 in it in competition and a comment from one of Britain's top flyers was quote "i didn't think that was a competitive model but you have just proved that theory wrong".

Ray
_________________
Flying stunt for 56 years, still not got it right

General :: RE: Engine ' Run Away ' ..... WHY ?

charlie — Tue, 19 Aug 2008 10:25:03 GMT

Author: charlie
Posted: Tue Aug 19, 2008 10:25 am (GMT 0)

I don't know about the `Too much oil" theory. How much is too much? The recommended level for the eternal Fox .35 stunt engine is 29% and they don't often run away unless they are brand new and seriously overheat.
Overheating is one reason that run away occurs. And of course, there are some engines that in standard form just want to go like hell no matter how rich you set them. Many of the OS .15s exhibit this characteristic.
It has been said that if the difference in blowdown between exhaust and bypass timings is too great, run away to full revs just happens. If you want to use an engine like that, you just have to live with it and let it rev and adjust the prop pitch and size to give you the speed you want.
_________________
Charlie Stone (The West Australian one)

Combat :: RE: Warlord Build help please

nigelb — Tue, 19 Aug 2008 10:15:59 GMT

Author: nigelb
Posted: Tue Aug 19, 2008 10:15 am (GMT 0)

Hi

Don't get excited, its the BMFA stand I'll be helping with - but of course if you guys want to buy some Dart kits to "play" with for the evening hangar sessions?

Logistics currently are outrageous - dining table covered in what may become a Warlord, car in garage (rear suspension u/s), caravan to collect this evening (!), working Thursday/Friday in Sheffield.

At this rate I'll be the one with a bicycle sleeping in a pup tent!

Nige

Combat :: RE: Warlord Build help please

Johninchester — Tue, 19 Aug 2008 10:08:43 GMT

Author: Johninchester
Posted: Tue Aug 19, 2008 10:08 am (GMT 0)

nigelb wrote:

Friday evening is looking busy (stand setup apart from anything else )

Nige

Quote = "(stand set-up apart from anything else)"

That needs a little explanation

What have you got that we might want ( Fuel, Food, Beer, Glue...)
_________________
John in Chester www.sbcschester.co.uk

General :: Engine ' Run Away ' ..... WHY ?

RobinHolden — Tue, 19 Aug 2008 09:45:18 GMT

Author: RobinHolden
Subject: Engine ' Run Away ' ..... WHY ?
Posted: Tue Aug 19, 2008 9:45 am (GMT 0)

Greetings from a damp Charente. Why do some engines 'run away '.

I expect most of you out there know why , but to a recent 'returnee' to C/L Stunt it's a real bugbear !

I recently had a note from someone I really respect in C/L who answered the question for me like this :

It could be too much oil !
The plug fouls up .... We needle - in ..... less fuel in total is flowing through the engine therefore more heat generated ......engine 'overheats' a tad ..... voila we've a 'runaway' !

We should resist overpropping as well.

Your comments / recommendations would be appreciated.

Robin [ ex-pat Brit in the Charente full of ex-pat Brits ! ]

Combat :: RE: Warlord Build help please

nigelb — Tue, 19 Aug 2008 09:09:09 GMT

Author: nigelb
Posted: Tue Aug 19, 2008 9:09 am (GMT 0)

Hi

Thanks very much for the offers guys.

Friday evening is looking busy (stand setup apart from anything else) but if the weather's ok Saturday evening looks possible?

A keg, eh, that smacks of preparation to me!

Nige

Combat :: RE: Warlord Build help please

choppersimon — Tue, 19 Aug 2008 07:20:34 GMT

Author: choppersimon
Subject: More offers
Posted: Tue Aug 19, 2008 7:20 am (GMT 0)

Yo Nige,

Blue Toyota Hiace van and a couple of tents, two boys, and plenty of "spare" combat models for playing with including engines, probably camped on the oposite side of the perri track from you, make yourself known mate,

ChopperSimon.

PS I have a keg too...
_________________
The 6 P's of success:

Proper Preparation Prevents Poor Performance

Combat :: RE: Warlord Build help please

nigelb — Tue, 19 Aug 2008 07:04:41 GMT

Author: nigelb
Posted: Tue Aug 19, 2008 7:04 am (GMT 0)

John

It may well come to that!

I'll be in a caravan probably the other side of the peri track, heading towards the control line nets.

Got the leading and trailing edges joined by the root and tip ribs, fill fit the rest this evening and start work on the engine pod while they dry.

I suspect I'm going to have to make a "Warlord" label up for this, or nobody is going to recognise what its supposed to be!

Nige

Engine Talk :: RE: PAW TBR 2 and TBR 2 GTS owners: Does this look like yours ?

raglafart — Mon, 18 Aug 2008 23:27:23 GMT

Author: raglafart
Posted: Mon Aug 18, 2008 11:27 pm (GMT 0)

candoo wrote:

carnt see me buy anything you Aussies make for team racing thats any good....maybe you don't know how to set your paw up right?????are you running them on d3000???to much comp to lean????your r250 have no chance against a tbr paw ask Mr rothwell

Hi Candoo
I really wasn't trying to start a pithing contest, I was honestly after some constructive advice. Your reply is hardly very constructive or helpful.

I know as most do that the power from any engine has to start with a good piston liner fit; you got to work very hard to make a contra piston loose in after only an hour or two of running regardless of how its used or abused and this one certainly ain't been abused, neglect maybe! but not on this side of the planet

Please consider this; A guy in our club has paid good money for an engine that just will not perform. He's not an engine expert, but non the less he paid good honest money for something that has never performed to advertised performance levels.
Now there is something very wrong with that, very wrong!

He has spoken to other club members and has found that to send an engine back to PAW is fraught with hidden costs and more disappointment plus the burden of VAT and mail costs in both directions and no guarantee of any performance gain at all.

All I am trying to do is help, I am trying to get the engine to perform to at least a modest level that is better than his plain bearing PAW's.

I have made a list of the problems I've encountered with this engine so far, they are not fabrications, they are manufacturing and inspection shortcomings that shouldn't have left the factory in my opinion.

Hi Ian
Thanks for the link to the earlier topic, I wasn't a member here when that one started. I did do a search prior to posting "PAW tunning" but it didn't turn up anything useful hence the post, this is obviously a continuing problem for PAW having read the link http://controlline.org.uk/phpBB2/viewtopic.php?t=1011

I had a very helpful PM from Mike Crossman with some very sensible advice. Thanks Mike

I'm done with this topic unless anyone has some proven performance tips for the TBR-2 and GTS engines 2.5 cc engines.

Thanks for your help guys
Cheers John

General :: RE: Uniflow Plumbing : With OR Without Pressure /

Ray Lloyd — Mon, 18 Aug 2008 21:19:27 GMT

Author: Ray Lloyd
Subject: uniflow
Posted: Mon Aug 18, 2008 9:19 pm (GMT 0)

on our uniflow tanks we use a reducer on the breather pipe to stop
_________________
Flying stunt for 56 years, still not got it right

General :: RE: 2008 WORLDs

combatmodeller — Mon, 18 Aug 2008 20:35:50 GMT

Author: combatmodeller
Posted: Mon Aug 18, 2008 8:35 pm (GMT 0)

Here we go then here's a fine picture of Olga's 6 Foot 5 Inch boyfriend.

Of course I would say so but he is a really nice guy.

There's also a picture of the Kazhakstan team with a young lady F2D Pilot for Jim. UNfortunately Jim her partner owns a Diamond mine so your chances could be blown there me thinks.
_________________
Rulehound - A variety of the domestic dog, usually having large, drooping ears, esp. one which hunts rules by scent.

Engine Talk :: RE: PAW TBR 2 and TBR 2 GTS owners: Does this look like yours ?

Ian S — Mon, 18 Aug 2008 20:22:36 GMT

Author: Ian S
Posted: Mon Aug 18, 2008 8:22 pm (GMT 0)

I think somehow we have been down this thread before
try
http://controlline.org.uk/phpBB2/viewtopic.php?t=1011

Of course there is always the good old "new Goodyear thread" of a similar tact
_________________
Ian Sykes
Salisbury

Engine Talk :: RE: PAW TBR 2 and TBR 2 GTS owners: Does this look like yours ?

candoo — Mon, 18 Aug 2008 19:32:18 GMT

Author: candoo
Posted: Mon Aug 18, 2008 7:32 pm (GMT 0)

carnt see me buy anything you Aussies make for team racing thats any good....maybe you don't know how to set your paw up right?????are you running them on d3000???to much comp to lean????your r250 have no chance against a tbr paw ask Mr rothwell