ANYONE ELSE WITH A 21 SST HAVING PORPOISE TROUBLE RUNNING AT LOW SPEEDS.
ANYONE ELSE WITH A 21 SST HAVING PORPOISE TROUBLE RUNNING AT LOW SPEEDS.
What speeds you talking?
Bullets are not made for low speeds, get you a astroglass if you want to go slow, lol, just kidding, I hate a boat that does that.
Under 30 mph my XRS likes to porpoise
XRS/250 ProXS
Mine does it until 40 mph, having serious issues setting this boat up in general. Terrible holeshot (blows out bad). Boat will not lift nor carry a load with a 28 Bravo XS. I am running a 250 4 atroke pro xs. Had a phoenix 920 run off and leave me. THis boay is running 73 loaded with 2 people. It is almost embarrassing.
Mine does seem to want to porpoise a little coming off plane but not to bad I don't think. But I'm running a different motor combo than you.
2020 Allison XB 21
Merc 300R
2018-SST Bullet
Merc 300R
Bullet 20XD
300XS DBR
Time... It'll take a little time to get it setup and running... Your dealer, the board and the factory are an extremely knowledgeable bunch, use them. Plus you'll need to put in the seat time to make it happen... Don't get frustrated, there's a learning curve with a Bullet... With my 21XRS it took me a better part of a week just to get it out of the hole consistantly, but after playing with the PVS system it now rockets out... Time and patience... Dan
Are you trimming it up to fast? This will cause porpoising and slower speeds also keeping it trimmed up while coming off plane will also cause it.
Bullet 21xrd Mercury 300xs
Trimming up to fast causes prop to slip so if your jamming the gas and trimming to the moon it never allows prop to take a set
Bullet 21xrd Mercury 300xs
Power poles? What prop?
Marks Props 317-398-9294, 1850 East 225 South, Shelbyville, Indiana 46176 propellerman59@gmail.com http://www.marksprops.com/index.html
Motor is tucked and no trim. I had a 20xf with a 250 Proxs with a sport master and drove the crap out of it. Not a seat time issue. Need to try some other props but where I am at all people have is 26 and under tempest and trophies. Also, can jam the gas on take off, have to feather it to get ot to break over. Tried difefrent PVS situations and basically the same issue. Only dealer is 60 miles away and he just started selling Bullets and really not familiar with the issue. I talked to Tom already and stated they don't have a lot of info on this set up. Not wanting to race just would like to have a boat that is not capable of passing a cookie cutter. I have a old 27 trophy that is a spare and if it works, I am gonna send the bravo tp get worked.
No poles/ 28 bravo 1 XS = 4 batteries
What is the setback ?
BULLET 21XRS 250 SHO
I think a foil would really help porpoising and breaking loose on hole shot.
Stock plate. I think it 14 inches, Have been thinking about the foil as well. Wanna figure the top end out first.
Surely someone has this exact boat with it set up to perform properly, 73 ? were you dragging an anchor ? Just kidding, hope you get her dialed in because i have one on order, will be asking lots of questions.
Check for full pull on the throttle linkage.
Marks Props 317-398-9294, 1850 East 225 South, Shelbyville, Indiana 46176 propellerman59@gmail.com http://www.marksprops.com/index.html
Did already. computer shows 99.7% on throttle. I am lost as hell on this. Mptor has never turned up over 5800 RPMS. Like I said earlier gonna run some smaller props and see what happenes, Raised motor 2 clics from factory setting and still no RPM differnce. Obviously not my first rodeo with motor eight etc but this is puzzling.
I’d put either a BMan foil on or ally foil. Also where is your prop shaft centerline to bottom of boat?
Allison XB 2002, 2.5 280
The foil should cure your porpoise. I run a different boat but mine done that. Night/Day difference. Hardest part was drilling the holes. But after first try was best thing I did. Also sound like your dragging with that low rpm. Also How is it loaded. I know the SST to is a new bullet model. And most of other bullets run 1” or more above pad. Curious to where your is set at. I’d call Paul Nichols & talk to him. He will steer you rt.
Allison XB 2002, 2.5 280