21' Scarab Prop

05-11-2003, 10:44 AM

I am in need of a new prop for my Scarab. I realize is is alot smaller than almost all of the ones here, but I could use some help. i purchased it at the end of last season and was only able to use it a few times. Due to intake leak, carb need rebuilding and exhaust leak I wasn't able to get a good rpm reading at WOT. I could get around 5000 with a 19 pitch Mich. prop that the prop guy said was so thin it was bending under load. It just felt like it was slipping alot. I am running a merc. 5.7 with an alpha drive. Merc. prop finder says to run a Mirage Plus 21p. Any suggestions will be appreciated. Thanks in advance.

Tinkerer · 05-11-2003, 11:56 AM

Find someone that has one and try it out before you buy it. That prop does sound about right.

28SCARAB · 05-13-2003, 08:57 PM

My old 87 Scarab 1 sounds about like your set up. I was running a MIRAGE 21 - 23 prop. I had a little bit of motor work- not much.
That was 10 years ago. That"s best I can remember. Sounds about right.

05-22-2003, 02:46 AM

Hi,

I have a Scarab 21’ with a Merc 350 Magnum and Alpha drive (gear ratio 1,47). Currently spinning a 21” Laser II prop (with the vent holes plugged) which gives me 4600 rpm at WOT. I also have a 24” Turbo prop that only gives 4100 rpm (surprisingly with the same top speed).