20 Hydro how do you get past the wall

[SayMikey]

We are going low to mid 60s and have hit a wall. No more speed,give it up guys. Nova Rossi,aa pipe 65% nitro H-7 3.2 It acts like thats all there is.............

 

[DickJones]

We are going low to mid 60s and have hit a wall. No more speed,give it up guys. Nova Rossi,aa pipe 65% nitro H-7 3.2 It acts like thats all there is.............

OK on the paypal and your address, what Boat,what Rossi engine, 3 port,5,7, head clearence, is it hard to launch, after U give me some more info perhaps I can help.

dick

 

[steve wood]

it all has to work together.head clearance,bowl volume,transfer /boost timing,exhaust timing,crank(induction timing),water jacket(heat),prop,strut angle,fuel,glow plug,pipe(and pipe length),BOAT,on,and on,and on. we had hit the wall also, till a couple weeks ago. there is no difinitive answer. i talked to Rocky tonight,try ,try, again. o,and carb also.

 

[Chris Wood]

mikey

what props are you running and what pipe lenght.. props is most of it.. motor helps but props.. i have so many props that i don't use any more that used to work on old boats.. if you are running the aa pipe try a 1450 cut to 46mm cup it up to 3.4 - 3.75 and cut off the tongues.

run the pipe 7 3/4 - 7 7/8.

what motor are you talking about?

chris

 

[Kevin Krogness]

it all has to work together.head clearance,bowl volume,transfer /boost timing,exhaust timing,crank(induction timing),water jacket(heat),prop,strut angle,fuel,glow plug,pipe(and pipe length),BOAT,on,and on,and on. we had hit the wall also, till a couple weeks ago. there is no difinitive answer. i talked to Rocky tonight,try ,try, again. o,and carb also.

WOW I'm going to have a ton of questions when I get a outrigger... With that said is it really that hard to just get a rigger going and be semi competitive? Sorry for the derail...

 

[SayMikey]

I have a few 1450 props to carve on,been running h- everythings Orlic 5 port pipe may be a 1/4 long. My concern is it looks like ive got all I can get65 % fuel in a UFO. Will 5% more nitro make that much difference and still be consistent.

 

[shoboat]

Mike,

Just give me a call, I will enlighten you on quite a few things you need to work on.

Hint: More C.O.B. Pitch, RPM = Speed so you need to increase your RPM. Mike your boat

is too heavy for much more speed, try around 3.5 lbs or less with the JAE-21.

Thanks,

Mark Sholund

231.590.3023

 

[Jeff Schindler]

Does anyone know how to modify a radar gun to read abaout 15% high? I think that is the easiest way. Seriously, 66 mph heat racing is killer. That being said, it would be a great accomplishment for us Evansville guys to get a .20 boat 75 mph and I really appreciate the help everyone has given. I don't think Evansville has ever had B-Hydros running that fast, and It may have to do with the weather more so than the effort and ingenuity put into the boats.

 

[Jeff Schindler]

I just took some measurements from our 66 mph pass to share.

UFO .21 hydro - 4.5 lbs dry weight

Frank Orlic Modified Novarossi 5-port

A/A .21 pipe 8.5" Flange to start of cone.

H7 prop @ 46.5mm tip-tip 3.50" trailing pitch, 2.95" COB

65% Nitro, 18% MeOH, 12% oil, by volume. Oil is 15 parts cool power, 2 parts castor.

 

[steve wood]

I just took some measurements from our 66 mph pass to share.

UFO .21 hydro - 4.5 lbs dry weight

Frank Orlic Modified Novarossi 5-port

A/A .21 pipe 8.5" Flange to start of cone.

H7 prop @ 46.5mm tip-tip 3.50" trailing pitch, 2.95" COB

65% Nitro, 18% MeOH, 12% oil, by volume. Oil is 15 parts cool power, 2 parts castor.

a few things:lose some weight. 70% nitro. s pipe,for sure.

 

[Duck899]

I just took some measurements from our 66 mph pass to share.

UFO .21 hydro - 4.5 lbs dry weight

Frank Orlic Modified Novarossi 5-port

A/A .21 pipe 8.5" Flange to start of cone.

H7 prop @ 46.5mm tip-tip 3.50" trailing pitch, 2.95" COB

65% Nitro, 18% MeOH, 12% oil, by volume. Oil is 15 parts cool power, 2 parts castor.

a few things:lose some weight. 70% nitro. s pipe,for sure.

Awe, there it is Mike......only the thin guys go fast!....

:lol:

 

[dwilfong]

I just took some measurements from our 66 mph pass to share.

UFO .21 hydro - 4.5 lbs dry weight

Frank Orlic Modified Novarossi 5-port

A/A .21 pipe 8.5" Flange to start of cone.

H7 prop @ 46.5mm tip-tip 3.50" trailing pitch, 2.95" COB

65% Nitro, 18% MeOH, 12% oil, by volume. Oil is 15 parts cool power, 2 parts castor.

That is a lot of weight to make go fast with a 21. If you get below 4lbs it will be much easer. It is real hard to get the weight of a boat that the basic tub and sponsons are already heave. You can whittle away at every thing but 1/2 a pound. that is allot of whittling.

David

 

[SayMikey]

Good thing is its not going to be his primary boat. We are clearing the Jae 21 right now.

 

[John Knight]

I just took some measurements from our 66 mph pass to share.

UFO .21 hydro - 4.5 lbs dry weight

Frank Orlic Modified Novarossi 5-port

A/A .21 pipe 8.5" Flange to start of cone.

H7 prop @ 46.5mm tip-tip 3.50" trailing pitch, 2.95" COB

65% Nitro, 18% MeOH, 12% oil, by volume. Oil is 15 parts cool power, 2 parts castor.

That is a lot of weight to make go fast with a 21. If you get below 4lbs it will be much easer. It is real hard to get the weight of a boat that the basic tub and sponsons are already heave. You can whittle away at every thing but 1/2 a pound. that is allot of whittling.

David

Gang,

Keep one principle in mind - you trade off reduction of weight for stability. It is VERY noticable when running in high winds, heavy chop and with a lot of boats in the heat race. If you run among 3-4 boats per heat, then the chop from the boats will be small. If you run in heats with 6-7 other boats then the chop is considerably greater. Here in the southeast, we usually run in 8 boats heats with most every class. So the boat setup is for that type of racing.

The traditional designs (not the JAE styled) boats do not run well with weight below 3lbs 10 oz in the conditions noted above. I have seen very few boats that can do that with any degree of regularity. There are still refinements being done with the JAE21 so time will tell on them but they seem to be running counter to the usual results. The ENTIRE package is MORE important than less weight. All must be in sync if you want to get in the 70's and even higher.

 

[Joe Warren]

Mikey have you had a OPS 3280 pipe on it & 3 1/4 - 3 1/2? 1450 backcut 3.4 - 3.8 Also a Cut down H-10. What is the head temp?

 

[Chris Wood]

mike just from the sounds of it the pipe is long.. shove that baby in. 5% won't make that much a difference on the nitro situation.. may a tink but not a HUGE difference.

weight is a big deal BUT you can still get that thing in the 70's. i had a old sg over 5lbs that run mid 70's so i know it can be done.

try shoving the pipe in.. is the current set up hard to launch? try a cut down 1450 46mm or so and see what shakes out.. if you want give me a call

319-750-0893

chris

 

[SayMikey]

mike just from the sounds of it the pipe is long.. shove that baby in. 5% won't make that much a difference on the nitro situation.. may a tink but not a HUGE difference.

weight is a big deal BUT you can still get that thing in the 70's. i had a old sg over 5lbs that run mid 70's so i know it can be done.

try shoving the pipe in.. is the current set up hard to launch? try a cut down 1450 46mm or so and see what shakes out.. if you want give me a call

319-750-0893

chris

This boat launches every time,do in part to a 3x 1/2 inch ski on the leading edge of the shaft log<coming out of bottom of boat. We wll be testing again next weekend thanks for all the help.

 

[Joe Warren]

3280 OPS 3 1/4 pipe length from the Plug to the band Would be for a saw attempt... If any other pipe works better on Franks mod N/R .21 I have Not seen it....... Head clearence @ .006 -.008 pipe 3 3/8 - 3 1/2 I would like to hear it then..... MEOooooooooooooooooooW. Got the get the Engine & Pipe Correct then the Boat & onto tweaking the prop....... Just in that order.

 

[twox45]

Mike you need to spend about 30 minutes on the phone with Ron Zaker before you run your new 21 JAE. He, David Prusse, and Martin Truex have done more testing with the 21 JAE kit boat than any one, with some very positive results (built to spec).

David

 

[SayMikey]

Indeed I saw several exceed 70 this past weekend. By far Chris Wood had the best speed,in the end I think David Preusse won 1st. I need to get some props going and a new build.......