Dumas Hawk .21

[john schultheis]

Well still trying to get this hawk running first time out this year and still no luck however it came in everytime under its own power

i'm having problems getting the rpms up so the boat can get up on plane it sounds extremely rich but when i try leaning it out then it just dies i talked to joe at zipp kits and he told me to try one of his props so i bought a 1450 and tried that its better but stil no luck the motor is a thunder tiger .21 and i'm running 30% o donnels fuel any ideas would be greatly apprecited since i've tried everything i can thing of thanks

 

[john schultheis]

i gonna try jumping down to a 440 prop and see if that helps

 

[gil sonsino]

John I guess the problem is the lack of power of your TT 21.The Hawk compared to the new riggers is heavy and needs a good engine like a Novarossi or a GO if you can't turn the Zipp 1450(46mm).What pipe are you using? Gill

 

[dwilfong]

Try a grimracer 42x66 lifter prop.

David

 

[hugh hargett]

Is your strut set too shallow/deep? Gil his motor should get it up unless theres a problem with it. Heres a video of an fe hawk on a 3674 feigao 10xl . Not much more than a hp in that. Id check the strut depth an all. His 21 has to have at least a hp :unsure: - I hope.

Video:http://www.youtube.com/watch?v=bTPkO1Ei8UU

The hawks do okay when set up - for what they are.

 

[shoboat]

John,

A propeller like an H-5 with reduced cup is what you need or more nitro%.

The cup is loading your motor too much.

Have Fun Testing,

Mark

 

[john schultheis]

i've tried adjusting the strut doesn't make much of a difference the pipe is a mac and the length is 8 1/2 inches

 

[Tim_Duggan]

What is the head clearance set to on your TT?

 

[Lay26]

ninja sprint if you could get one would be great!!!.... pipe is too long and the head clearance may need to be set right

 

[tmunn]

A modified hawk and good motor and pipe will run with any of the new stuff.Mine is actually lighter than my JAE.Mine like an H4 the best.

 

[David Murany]

i've tried adjusting the strut doesn't make much of a difference the pipe is a mac and the length is 8 1/2 inches

I would suggest shortening the pipe to 8 inches and bumping up the nitro%. Never had much luck with o'donnell fuels. Good luck.