Single or twins?

[Mark]

Nitro,

I would like to know about that to.

The 67's must just have that optimum balance of hull size, weight etc,etc. Maybe someone can post the heat times to compare from a top level meeting like the nationals either from Oz or overseas.

 

[Ozzy]

Ian

The fastest heat time at the nationals was 1.08 and that was set by Steve Gruber with a CMB 80 powerd egal twin. But i have seen times down to 1.01 at club days and that was with a twin CMB 90's.

It depends a lot on the driver and setup on the day and the conditions but i did set the fastest time at the 2001 nationals and that was with a MAC67 Sprint witch was 1.08.

The 67 size boat is stabel enough to drive wright on the boys and this what you need to doo to set a fast time it can be done with a 90 boat as they will handel just as well you just have to drive on the boys.

You can allso do it wth a twin if you feel lucky and taken your brave pills.

CHD Racing Paul :

 

[Ian Inverarity]

Paul,

I didn't know the twins were down to 1.01's, that is pretty good!

I shall be having a go with my single 90 to see what I can do, but I think Aaron's 67 will get fastest heat time if he can get it running!

I looked up the fastest heats of NAMBA nats for the last few years and the results aren't really conclusive.

In 2002 the fastest heat was by a 67: 1.07

for 90's it was 1.12 and for twins it was 1.24

In 2001 the fastest heat was by a 45: 1.17

for 67's it was 1.23 and for 90's it was 1.25

In 2000 the fastest heat was by a 90: 1.20

for the 45's it was 1.24 and for the 67's it was 1.31

So actually there is no pattern at all! ???

Ian.

 

[Twin_k90]

Ian,

i think it all comes down to weather you get a clean run or not,

bill has run 1.01 at hunter valley!

Dale

 

[EatMyShortsRacing]

Ian,

Have you weighed your hummingbird with a 67 instead of the 90? Is yours a 67/80 boat with the 90 in it?

Dale... So where is my boat??? huh???

EMS Racing Impatience is a virtue

 

[Ian Inverarity]

Craig,

The 67 engine is about 200g lighter. My hull is a stretched version of the 67/80 boat, a bit longer and wider stance. I dont think it would be much heavier than the 67/80 boat. Say 1/2 a kilo max lighter, probably less than that.

Hey, let him finish fixing his first!

Ian.

 

[EatMyShortsRacing]

My boat should be high priority!!!!

Now all I need is 2 90s... better get another order in...



Hey Ian how much are the bolly pipes?? Think I better try one (or 2) just to see if I have been barking up the wrong tree....

EMS Racing double the fun

 

[Ian Inverarity]

Craig,

More A's the better! ;D

The Bolly pipes, MP-92's which are muffled (and very quiet, you will probably drill the baffle! ) are $125 each. See here. Made to order tho, takes about 2 weeks. A motors love them.... 8)

http://www.bolly.com.au/models/pipes.asp

Nitrocrazed racing: My pipes are stronger than my hulls....

 

[Twin_k90]

craig,

all the templates have been done for the hull, waiting on some good ply to make them out of, should have them done tomorrow, the glasser will only take a week or so with the tub,

sponsons,

i cut the foam for mine last night, just have to shape them now and them they are ready to lay up, if these ones come out good i will give them to you!

Dale

 

[labtocc]

Been there....done that! Have a 70" Expresscraft I bought from a shop on consignment....it looked so bad! Twin Zen's /twin Kanellos(counter rotating). When I finally got it running it sounded and looked so good. But it was such a pain to work on those tightly fit in engines that I finally in disgust ripped them out and slid a 42cc Zen in place. Right after that I traded Marty for his Taz(JUST BAD) now I have a pair!

 

[Twin_k90]

You get used to working on them, they are a pig to work on at times, but the sound is awesome!!

Dale

 

[Ian Inverarity]

The problem with twins is everytime you want to try something you have to buy 2! Like 2 pipes, two props etc! Gets expensive! I have never driven one tho, I bet it is interesting! ;D

Ian.

 

[labtocc]

;D I found twins to be awesome....but as others have noted ....twice the price ...twice the pain.... would not have another unless I was wealthy , and had someone else to do the work!!!! But GOD it was so awesome in sound and propwash and ..and....and....