GIANTS FROM DOWN UNDER (Continued)

[Devo]

So why wouldnt Phil move up??????????????? about time...

Well done Phil, Daniel, Stu and Tony and to all the guys in the comp....

You said Game faces for Bendigo....is Phil and Daniel now going again? If so cool !!!!

post photos......

[Talbs]

	Quote: Originally Posted by Doc
	Correct me if I'm wrong anyone, but my understanding is that the compression ratio in a DA100 is such that it does not need 98 octane, and that the higher octane may just make it more prone to pre-detonation without any power advantage. Higher compression engines like zdz should enjoy 98. I use 95 'cause I figure it usually sits around for a few weeks between flights and this leaves a bit of room if it drops its octane anyway. I tend to use the same petrol station or at least brand to keep the brew more consistant, and have a mark on the fuel can that I fill to for consistant volume. (No, I don't bother about the outside air temperature, barometric pressure or carry a burette with me...)

That's what ivé always been taught in my aviation field. Howie/ Richo could confirm but 91-95 is all that's needed for Da . 3w and zdz have higher comp ratio therefore require higher oct, ie 98.

[Cookie]

For Sale, 40% Comp ARF 260 powered by DA 170 on KS cans.

All the bling, Royal, LiIons all round, JR alloy case Digitals, no expense spared.

will be on the ASAA site when I get a photo.

[Jag01]

	Quote: Originally Posted by Doc
	Correct me if I'm wrong anyone, but my understanding is that the compression ratio in a DA100 is such that it does not need 98 octane, and that the higher octane may just make it more prone to pre-detonation without any power advantage. Higher compression engines like zdz should enjoy 98. I use 95 'cause I figure it usually sits around for a few weeks between flights and this leaves a bit of room if it drops its octane anyway. I tend to use the same petrol station or at least brand to keep the brew more consistant, and have a mark on the fuel can that I fill to for consistant volume. (No, I don't bother about the outside air temperature, barometric pressure or carry a burette with me...)

Doc,

I am with you here, Higher Octane will not have any major impact on performance for an engine which does not have a high enough compression ratio to necessitate the higher octane.

Octane is a rating system which represents a fuels resistance to knocking (pre -detonation), this detonation can result from a number of things, however in essence it is heat related. IE; high compression pressures and as a consequence high temperatures, high cylinder temps caused by lack of cooling, high ambient temps, incorrect ignition timing and a myriad of other things.

If an engine has low compression ratio's 8.5 :: 1 it really would not benefit from having a higher Octane fuel, as it should not be prone to detonation on our standard unleaded fuels. Unless of course it is detonating due to a problem.

Cheers,

Jeff

[wiz310]

Good onya Garry. great to see you placing in the new class already. I will have to work a little at chasing you down now.
Give me a ring when your back up here next. I have something to show you. ( I am closer to basic than ever now. )
Managed about two and a half hours in the air today, and so did my mate who maidened his new Gas Aghusky. what an awesome weekend. nearly five hours in the air. Gotta love Gas airplanes..... I couldn't have afforded the fuel if I was flying glow still.

[RustyTumbles]

	Quote: Originally Posted by Doc
	Correct me if I'm wrong anyone, but my understanding is that the compression ratio in a DA100 is such that it does not need 98 octane, and that the higher octane may just make it more prone to pre-detonation without any power advantage. Higher compression engines like zdz should enjoy 98. I use 95 'cause I figure it usually sits around for a few weeks between flights and this leaves a bit of room if it drops its octane anyway. I tend to use the same petrol station or at least brand to keep the brew more consistant, and have a mark on the fuel can that I fill to for consistant volume. (No, I don't bother about the outside air temperature, barometric pressure or carry a burette with me...)

You are right that the DA100 does not need 98 octane fuel, however running such fuel will not make it more prone to pre-detonation.

[Jag01]

	Quote: Originally Posted by wiz310
	Good onya Garry. great to see you placing in the new class already. I will have to work a little at chasing you down now.

Wiz,

I can tell ya he flew pretty dam well in some pretty crappy conditions.

Check out todays wind graph, what it doesn't show is the gusts another 10-15 knts higher!!!!!

Cheers,

Jeff

[rcdart]

	Quote: Originally Posted by Cookie
	For Sale, 40% Comp ARF 260 powered by DA 170 on KS cans. All the bling, Royal, LiIons all round, JR alloy case Digitals, no expense spared. will be on the ASAA site when I get a photo.

Why? I thought you were happy with it.

[Stu_D]

	Quote: Originally Posted by Devo
	So why wouldnt Phil move up??????????????? about time... Well done Phil, Daniel, Stu and Tony and to all the guys in the comp.... You said Game faces for Bendigo....is Phil and Daniel now going again? If so cool !!!! post photos......

I'm pretty sure Phil's days are numbered in basic but I better give him a bit of a push befor the next comp . As for the boys going to the masters its a no go for both of then .

Shame you couldn't make it down to SWAMPS it turned out to be a great day .

Stu

[Mr Frodo]

	Quote: Originally Posted by rcdart
	Why? I thought you were happy with it.

Maybe "it's all about the build??"

[Cookie]

I do Mick, I think it is well wasted on me though.

Someone out there with talent will get much better use from it.

	Quote: Originally Posted by rcdart
	Why? I thought you were happy with it.

[rcdart]

	Quote: Originally Posted by Cookie
	I do Mick, I think it is well wasted on me though. Someone out there with talent will get much better use from it.

Can't accept that for an excuse, otherwise I have to sell mine

[Cookie]

Ha, ha, I'm not in unlimited though Mick.

	Quote: Originally Posted by rcdart
	Can't accept that for an excuse, otherwise I have to sell mine

[Talbs]

Don't sell it Cookie, its way to nice.

You boys up there need to get him out more so he can get out and fly it !!!!

[Cookie]

hey talbs, (get out and fly it !!!!), you must be thinking of someone else.

The boy wants to go motocross racing so I have to make the sacrifice.

	Quote: Originally Posted by Talbs
	Don't sell it Cookie, its way to nice. You boys up there need to get him out more so he can get out and fly it !!!!