NON step 35 Top Speeds
#112
Registered

Joined: Jan 2010
Posts: 617
Likes: 144
From: syracuse ny
My 89 10 meter has 468 blocks with 088 heads and 177 blowers. The motors made 610 hp on the dyno. I have trs drives and with 28 bravos or 26 hydros I run the exact same top speed of 75. The boat handles better with the hydros and both sets of prop spin to 5000. I have been debating switching to bravos and probably picking up 10 mph.
#118
Registered

Joined: Feb 2020
Posts: 68
Likes: 37
I have extensively tested and can provide some info that others may find beneficial with 10m/35 straight bottoms. Spinning props in was faster than spinning out at every rpms. Always. Docking sucked when converting to spinning in. Boater beware.
My setup for findings: Late 1993/early 1994 35. 715 lb ft torque, 740 hp 572 Dart based builds. NA. Pump Gas 93. Drives Bmax with 1.30 gears. Testing has been reported with IMCO SC Std Length lower as well as -2 IMCO SC lowers. XD as built on the fountain performance report in late 1993 was 16". I have measured extensively and with std length lowers and with that I was 5.865" under prop shaft depth. With IMCO SC -2 lowers I was at 3.865". The boat was faster with 3 blade mirage + props everywhere until I went above 5" below. The boat with a deeper x dimension with 4 blade bravos plowed, did not carry the bow, and was much slower. Once I went -2 I was no longer able to plane with 3 blade props. 4 blade Bravos became the test props once went to -2. 24p and 26p. 5" seems to be the magic number to get to or close to and run 3 blades with less power. The cost benefit analysis of higher with the 4 blade may be different with a 1.50 gear helping to spin the extra blade.
Drive toe:
Mission critical. 1/8" toe in or out depending on spinning in or out. Toe changes with rotation. Fastest I found was spinning in with the imco sc bullets 1/8" closer together with the prop shafts 1/8" wider. I found over 90 mph and under 90 mph the 1/16" versus 1/8" toe to be beneficial. Under 90 mph try 1/16", over 90 try 1.8".
Slip:
Spinning in was faster, always.
STD 16" XD: Docking sucked compared to spinning out. Depends how bad you want the top speed. Spinning props in I would find 8-9% slip at 5.865" under consistently with Mirage 3 blades. Spinning 3 blades out I would see 10.5-11.8% slip depending on prop.
-2 18" XD: Docking still sucked but was much easier to move around the dock with the bravo 4 blades. Felt faster around the dock in and out of gear. Planed effortlessly with 4 blades, could not plane with 3 blades. Slip numbers spinning in were in the low 12% to low 13%.
Speeds/RPM:
In a 1.30 gear in a BMAX I always found spinning a bigger prop slightly slower worked better than zinging a smaller prop 300-400 rpms more. This may not translate to a 1.50 bravo boat 1-1 but eventually I will upgrade to an scx upper with a 1.50 gear and provide more feedback. The boat could eat standard bravos for lunch with 700+ lb ft running hard/poker run. BMAXs have had zero issues with the power.
Boat fully loaded with fuel and 25p B Blades lab finished 3 blade Mirage + would consistently run 88-89-90 mph gps. It took under half a tank and some chop to break 90 mph and the best it ever ran was 93.8 mph on the 25 mirage + 5700 ish rpms 1.30 gear 9.62% slip. Everyday of the week on a hot summer with fuel going somewhere with people it was a true 90 mph boat. Likely the 1.30 gear cost it 3-4 mph maybe more but in exchange was trouble free boating. I had wondered if a later thick floor xr sweptback drive set upper with a 1.50 gear would have been a good comparison, just never got there.
Boat fully loaded with fuel and 26p bravo 4 blades with -2 imco sc 95.1 mph 13.41% slip 5800 rpms. I found each inch you raised was about 250 real rpms on the dash with playing with other props. The boat felt awesome with -2 and finally got up and went and got much less "wet" in the water. Carried bow great and the boat felt fast. Unfortunately didn't do much more testing as it got cold and then went to Whipple 3.3 1000+ hp and torque builds. Will report back more as that project gets sea tested.
Hope this helps folks. The 35 straight bottom with a 1.50 gear and a true 650-700 a side is a weapon in under 3' seas and doesn't do anything crazy and rides well in the rough. I prefer them over the single step later 90s boats in terms of handling as well as build quality on the pre Fountain going public on the stock market assembly line build quality. If you are searching every mph spinning in with -2 lowers is a massive massive gain. I would recomend everyone with a early 90s fountain and a bravo based drive platform to raise the x. It still carried bow and the cruise speed gains were massive 5-7 mph. Since this is about top speed I didn't expand much there, but the boat was better everywhere higher with 4 blades but the 1.30 gear and a short test season results in the above. I think with the 1000+ hp and torque and a 1.30 gear it becomes beneficial and we will report back further if it can spin a 28 or 30p bravo 4 blade based prop.
My setup for findings: Late 1993/early 1994 35. 715 lb ft torque, 740 hp 572 Dart based builds. NA. Pump Gas 93. Drives Bmax with 1.30 gears. Testing has been reported with IMCO SC Std Length lower as well as -2 IMCO SC lowers. XD as built on the fountain performance report in late 1993 was 16". I have measured extensively and with std length lowers and with that I was 5.865" under prop shaft depth. With IMCO SC -2 lowers I was at 3.865". The boat was faster with 3 blade mirage + props everywhere until I went above 5" below. The boat with a deeper x dimension with 4 blade bravos plowed, did not carry the bow, and was much slower. Once I went -2 I was no longer able to plane with 3 blade props. 4 blade Bravos became the test props once went to -2. 24p and 26p. 5" seems to be the magic number to get to or close to and run 3 blades with less power. The cost benefit analysis of higher with the 4 blade may be different with a 1.50 gear helping to spin the extra blade.
Drive toe:
Mission critical. 1/8" toe in or out depending on spinning in or out. Toe changes with rotation. Fastest I found was spinning in with the imco sc bullets 1/8" closer together with the prop shafts 1/8" wider. I found over 90 mph and under 90 mph the 1/16" versus 1/8" toe to be beneficial. Under 90 mph try 1/16", over 90 try 1.8".
Slip:
Spinning in was faster, always.
STD 16" XD: Docking sucked compared to spinning out. Depends how bad you want the top speed. Spinning props in I would find 8-9% slip at 5.865" under consistently with Mirage 3 blades. Spinning 3 blades out I would see 10.5-11.8% slip depending on prop.
-2 18" XD: Docking still sucked but was much easier to move around the dock with the bravo 4 blades. Felt faster around the dock in and out of gear. Planed effortlessly with 4 blades, could not plane with 3 blades. Slip numbers spinning in were in the low 12% to low 13%.
Speeds/RPM:
In a 1.30 gear in a BMAX I always found spinning a bigger prop slightly slower worked better than zinging a smaller prop 300-400 rpms more. This may not translate to a 1.50 bravo boat 1-1 but eventually I will upgrade to an scx upper with a 1.50 gear and provide more feedback. The boat could eat standard bravos for lunch with 700+ lb ft running hard/poker run. BMAXs have had zero issues with the power.
Boat fully loaded with fuel and 25p B Blades lab finished 3 blade Mirage + would consistently run 88-89-90 mph gps. It took under half a tank and some chop to break 90 mph and the best it ever ran was 93.8 mph on the 25 mirage + 5700 ish rpms 1.30 gear 9.62% slip. Everyday of the week on a hot summer with fuel going somewhere with people it was a true 90 mph boat. Likely the 1.30 gear cost it 3-4 mph maybe more but in exchange was trouble free boating. I had wondered if a later thick floor xr sweptback drive set upper with a 1.50 gear would have been a good comparison, just never got there.
Boat fully loaded with fuel and 26p bravo 4 blades with -2 imco sc 95.1 mph 13.41% slip 5800 rpms. I found each inch you raised was about 250 real rpms on the dash with playing with other props. The boat felt awesome with -2 and finally got up and went and got much less "wet" in the water. Carried bow great and the boat felt fast. Unfortunately didn't do much more testing as it got cold and then went to Whipple 3.3 1000+ hp and torque builds. Will report back more as that project gets sea tested.
Hope this helps folks. The 35 straight bottom with a 1.50 gear and a true 650-700 a side is a weapon in under 3' seas and doesn't do anything crazy and rides well in the rough. I prefer them over the single step later 90s boats in terms of handling as well as build quality on the pre Fountain going public on the stock market assembly line build quality. If you are searching every mph spinning in with -2 lowers is a massive massive gain. I would recomend everyone with a early 90s fountain and a bravo based drive platform to raise the x. It still carried bow and the cruise speed gains were massive 5-7 mph. Since this is about top speed I didn't expand much there, but the boat was better everywhere higher with 4 blades but the 1.30 gear and a short test season results in the above. I think with the 1000+ hp and torque and a 1.30 gear it becomes beneficial and we will report back further if it can spin a 28 or 30p bravo 4 blade based prop.
#119
Registered

Joined: Nov 2007
Posts: 432
Likes: 9
From: The River
I have extensively tested and can provide some info that others may find beneficial with 10m/35 straight bottoms. Spinning props in was faster than spinning out at every rpms. Always. Docking sucked when converting to spinning in. Boater beware.
My setup for findings: Late 1993/early 1994 35. 715 lb ft torque, 740 hp 572 Dart based builds. NA. Pump Gas 93. Drives Bmax with 1.30 gears. Testing has been reported with IMCO SC Std Length lower as well as -2 IMCO SC lowers. XD as built on the fountain performance report in late 1993 was 16". I have measured extensively and with std length lowers and with that I was 5.865" under prop shaft depth. With IMCO SC -2 lowers I was at 3.865". The boat was faster with 3 blade mirage + props everywhere until I went above 5" below. The boat with a deeper x dimension with 4 blade bravos plowed, did not carry the bow, and was much slower. Once I went -2 I was no longer able to plane with 3 blade props. 4 blade Bravos became the test props once went to -2. 24p and 26p. 5" seems to be the magic number to get to or close to and run 3 blades with less power. The cost benefit analysis of higher with the 4 blade may be different with a 1.50 gear helping to spin the extra blade.
Drive toe:
Mission critical. 1/8" toe in or out depending on spinning in or out. Toe changes with rotation. Fastest I found was spinning in with the imco sc bullets 1/8" closer together with the prop shafts 1/8" wider. I found over 90 mph and under 90 mph the 1/16" versus 1/8" toe to be beneficial. Under 90 mph try 1/16", over 90 try 1.8".
Slip:
Spinning in was faster, always.
STD 16" XD: Docking sucked compared to spinning out. Depends how bad you want the top speed. Spinning props in I would find 8-9% slip at 5.865" under consistently with Mirage 3 blades. Spinning 3 blades out I would see 10.5-11.8% slip depending on prop.
-2 18" XD: Docking still sucked but was much easier to move around the dock with the bravo 4 blades. Felt faster around the dock in and out of gear. Planed effortlessly with 4 blades, could not plane with 3 blades. Slip numbers spinning in were in the low 12% to low 13%.
Speeds/RPM:
In a 1.30 gear in a BMAX I always found spinning a bigger prop slightly slower worked better than zinging a smaller prop 300-400 rpms more. This may not translate to a 1.50 bravo boat 1-1 but eventually I will upgrade to an scx upper with a 1.50 gear and provide more feedback. The boat could eat standard bravos for lunch with 700+ lb ft running hard/poker run. BMAXs have had zero issues with the power.
Boat fully loaded with fuel and 25p B Blades lab finished 3 blade Mirage + would consistently run 88-89-90 mph gps. It took under half a tank and some chop to break 90 mph and the best it ever ran was 93.8 mph on the 25 mirage + 5700 ish rpms 1.30 gear 9.62% slip. Everyday of the week on a hot summer with fuel going somewhere with people it was a true 90 mph boat. Likely the 1.30 gear cost it 3-4 mph maybe more but in exchange was trouble free boating. I had wondered if a later thick floor xr sweptback drive set upper with a 1.50 gear would have been a good comparison, just never got there.
Boat fully loaded with fuel and 26p bravo 4 blades with -2 imco sc 95.1 mph 13.41% slip 5800 rpms. I found each inch you raised was about 250 real rpms on the dash with playing with other props. The boat felt awesome with -2 and finally got up and went and got much less "wet" in the water. Carried bow great and the boat felt fast. Unfortunately didn't do much more testing as it got cold and then went to Whipple 3.3 1000+ hp and torque builds. Will report back more as that project gets sea tested.
Hope this helps folks. The 35 straight bottom with a 1.50 gear and a true 650-700 a side is a weapon in under 3' seas and doesn't do anything crazy and rides well in the rough. I prefer them over the single step later 90s boats in terms of handling as well as build quality on the pre Fountain going public on the stock market assembly line build quality. If you are searching every mph spinning in with -2 lowers is a massive massive gain. I would recomend everyone with a early 90s fountain and a bravo based drive platform to raise the x. It still carried bow and the cruise speed gains were massive 5-7 mph. Since this is about top speed I didn't expand much there, but the boat was better everywhere higher with 4 blades but the 1.30 gear and a short test season results in the above. I think with the 1000+ hp and torque and a 1.30 gear it becomes beneficial and we will report back further if it can spin a 28 or 30p bravo 4 blade based prop.
My setup for findings: Late 1993/early 1994 35. 715 lb ft torque, 740 hp 572 Dart based builds. NA. Pump Gas 93. Drives Bmax with 1.30 gears. Testing has been reported with IMCO SC Std Length lower as well as -2 IMCO SC lowers. XD as built on the fountain performance report in late 1993 was 16". I have measured extensively and with std length lowers and with that I was 5.865" under prop shaft depth. With IMCO SC -2 lowers I was at 3.865". The boat was faster with 3 blade mirage + props everywhere until I went above 5" below. The boat with a deeper x dimension with 4 blade bravos plowed, did not carry the bow, and was much slower. Once I went -2 I was no longer able to plane with 3 blade props. 4 blade Bravos became the test props once went to -2. 24p and 26p. 5" seems to be the magic number to get to or close to and run 3 blades with less power. The cost benefit analysis of higher with the 4 blade may be different with a 1.50 gear helping to spin the extra blade.
Drive toe:
Mission critical. 1/8" toe in or out depending on spinning in or out. Toe changes with rotation. Fastest I found was spinning in with the imco sc bullets 1/8" closer together with the prop shafts 1/8" wider. I found over 90 mph and under 90 mph the 1/16" versus 1/8" toe to be beneficial. Under 90 mph try 1/16", over 90 try 1.8".
Slip:
Spinning in was faster, always.
STD 16" XD: Docking sucked compared to spinning out. Depends how bad you want the top speed. Spinning props in I would find 8-9% slip at 5.865" under consistently with Mirage 3 blades. Spinning 3 blades out I would see 10.5-11.8% slip depending on prop.
-2 18" XD: Docking still sucked but was much easier to move around the dock with the bravo 4 blades. Felt faster around the dock in and out of gear. Planed effortlessly with 4 blades, could not plane with 3 blades. Slip numbers spinning in were in the low 12% to low 13%.
Speeds/RPM:
In a 1.30 gear in a BMAX I always found spinning a bigger prop slightly slower worked better than zinging a smaller prop 300-400 rpms more. This may not translate to a 1.50 bravo boat 1-1 but eventually I will upgrade to an scx upper with a 1.50 gear and provide more feedback. The boat could eat standard bravos for lunch with 700+ lb ft running hard/poker run. BMAXs have had zero issues with the power.
Boat fully loaded with fuel and 25p B Blades lab finished 3 blade Mirage + would consistently run 88-89-90 mph gps. It took under half a tank and some chop to break 90 mph and the best it ever ran was 93.8 mph on the 25 mirage + 5700 ish rpms 1.30 gear 9.62% slip. Everyday of the week on a hot summer with fuel going somewhere with people it was a true 90 mph boat. Likely the 1.30 gear cost it 3-4 mph maybe more but in exchange was trouble free boating. I had wondered if a later thick floor xr sweptback drive set upper with a 1.50 gear would have been a good comparison, just never got there.
Boat fully loaded with fuel and 26p bravo 4 blades with -2 imco sc 95.1 mph 13.41% slip 5800 rpms. I found each inch you raised was about 250 real rpms on the dash with playing with other props. The boat felt awesome with -2 and finally got up and went and got much less "wet" in the water. Carried bow great and the boat felt fast. Unfortunately didn't do much more testing as it got cold and then went to Whipple 3.3 1000+ hp and torque builds. Will report back more as that project gets sea tested.
Hope this helps folks. The 35 straight bottom with a 1.50 gear and a true 650-700 a side is a weapon in under 3' seas and doesn't do anything crazy and rides well in the rough. I prefer them over the single step later 90s boats in terms of handling as well as build quality on the pre Fountain going public on the stock market assembly line build quality. If you are searching every mph spinning in with -2 lowers is a massive massive gain. I would recomend everyone with a early 90s fountain and a bravo based drive platform to raise the x. It still carried bow and the cruise speed gains were massive 5-7 mph. Since this is about top speed I didn't expand much there, but the boat was better everywhere higher with 4 blades but the 1.30 gear and a short test season results in the above. I think with the 1000+ hp and torque and a 1.30 gear it becomes beneficial and we will report back further if it can spin a 28 or 30p bravo 4 blade based prop.
#120
Registered

Joined: Feb 2020
Posts: 68
Likes: 37
Happy to help. Unfortunately you will all have to carry the torch on future testing. Have moved into a staggered 42 with 6s. I figured these pics may help folks with the above on angle of attack and the differences shorty's made on a 35 straight bottom.
3 Blade 5.865" Under- Sits back and runs entirely different. Tail wet.

4 Blade 3.865" Under boat ran entirely different, much flatter and got the back up with the 4 blades spinning in and ran on the variable pad and notch much less wet.

3 Blade 5.865" Under- Sits back and runs entirely different. Tail wet.

4 Blade 3.865" Under boat ran entirely different, much flatter and got the back up with the 4 blades spinning in and ran on the variable pad and notch much less wet.





