Thunderboat speed and prop questions
I just got my new Aeromarine t-boat on the water. Just starting to get things dialed in. Lots of tweaking left to do. As of right now it is running about 50-51 on the radar gun with the engine pretty rich. What should I be shooting for as far as competitive race speeds? Right now I am running the X572 they sent me. No mods, just sharpened and balanced. This is my first gasser, and I do not have a collection of props yet. Looking for suggestions on what to try next.
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RE: Thunderboat speed and prop questions
ORIGINAL: fast9 I just got my new Aeromarine t-boat on the water. Just starting to get things dialed in. Lots of tweaking left to do. As of right now it is running about 50-51 on the radar gun with the engine pretty rich. What should I be shooting for as far as competitive race speeds? Right now I am running the X572 they sent me. No mods, just sharpened and balanced. This is my first gasser, and I do not have a collection of props yet. Looking for suggestions on what to try next. |
RE: Thunderboat speed and prop questions
You will no doubt be running a stock motor if your racing? if so speeds you should probably be aiming for are mid to high 50s,from what ive seen on the boards these are the speeds guys are running competetiveley in race trim although 60+ mph has been reached with stock motors.
Mart try over on jims boat dock theres more guys on there who run these cool boats |
RE: Thunderboat speed and prop questions
I'd like to see how a 21 lb. Thunderboat runs over 60 mph with a stock engine, if it does, the stock engine needs to turn 18000 rpm with a 7016 prop in the water, Can a stocker turn that high? if so, it must a full mod engine.
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RE: Thunderboat speed and prop questions
ORIGINAL: rcboateric I'd like to see how a 21 lb. Thunderboat runs over 60 mph with a stock engine, if it does, the stock engine needs to turn 18000 rpm with a 7016 prop in the water, Can a stocker turn that high? if so, it must a full mod engine. ps speed isnt allways about rpm its about making the best of whats available,match the right prop to the motor etc. Mart [link]http://www.blazermarine.com/videos/Lauterbach42708.mpg[/link] Jim Geigers Rockett somewhere in region of 54 mph i believe stock motor again. [link]http://uk.youtube.com/watch?v=HxalhItqJvw[/link] |
RE: Thunderboat speed and prop questions
The Thuderboat speed record is 56.948 mph at the NAMBA, if you think your similar boat can kick this record out, please go ahead.
http://www.namba.com/content/records.asp?EventType=10 |
RE: Thunderboat speed and prop questions
ORIGINAL: rcboateric The Thuderboat speed record is 56.948 mph at the NAMBA, if you think your similar boat can kick this record out, please go ahead. http://www.namba.com/content/records.asp?EventType=10 Mart |
RE: Thunderboat speed and prop questions
My point is simple, I was just trying to find out the true speed for the Thunderboat, if you're not agree with that, borrow a GPS and put it in yours and run it.
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RE: Thunderboat speed and prop questions
True speed? well theres many thunderboats arround just do some research and im sure you will find all that i have?,most are in the low to mid 50s in race trim as ive said and ive talked to many who race them ive no reason to not believe them .My boat has a full mod so id say its over those speeds ;).The guy who started this thread has recorded speeds of 51 mph with the motor not fully tuned in yet so what does that tell you?.Tell you what why dont you buy a thunderboat yourself and stick that hornet motor in you like so much and ill gurantee you will be surprised how fast it will go and it wont blow over like a cat either ;).
Mart |
RE: Thunderboat speed and prop questions
I really would like to see a Thunderboat that can run in 70's or 80's just like our cats and riggers, I'm not hating everyone who has a similar boat that could run over 60mph or more but why don't you respect that NAMBA, the boat speed record is 56.948mph or unless they forgot to update it.
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RE: Thunderboat speed and prop questions
ORIGINAL: rcboateric I really would like to see a Thunderboat that can run in 70's or 80's just like our cats and riggers, I'm not hating everyone who has a similar boat that could run over 60mph or more but why don't you respect that NAMBA, the boat speed record is 56.948mph or unless they forgot to update it. Mart |
RE: Thunderboat speed and prop questions
I'm looking forward to see those Thunderboat owners that can going there to replace that speed record just like Wally did, otherwise, its speed limit is 56.9mph to me so far.
Class: Classic Thunderboat Name: Jim Johnson Date: 09-08 Sec: 3.951 MPH: 56.948 Egine: Zenoah Hull: Insane Prop: Propworks 6717 |
RE: Thunderboat speed and prop questions
The Blazer Marine Lauterbach will indeed do 60 mph with a stock Zen and a M&D pipe. We run a PropWorks 6518-3-415. The boat is modeled after the "Deepwater Special" ;)
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RE: Thunderboat speed and prop questions
ORIGINAL: juicr The Blazer Marine Lauterbach will indeed do 60 mph with a stock Zen and a M&D pipe. We run a PropWorks 6518-3-415. The boat is modeled after the "Deepwater Special" ;) |
RE: Thunderboat speed and prop questions
At last, somebody posting an answer to the question instead of joining in on the pissing contest!
The NAMBA record trials are in a couple of weeks at Legg Lake so just maybe a new one will be set for the T-boats. |
RE: Thunderboat speed and prop questions
Just because ONE Owners of a Thunder Boat at a SAW event did 56.9, does not mean that there are not others with thunder boats going faster ?
A SAW contest is a pissing match of the moment, maybe your fast that day, maybe not ? .... But in a class as new as the Thunder boats, he was the fastest that day in a class that had no pre-established record on the books. Weight has a LOT LESS effect on how fast a boat go's when talking "Air Trap" hydros that when trimmed right ride on a pocket of air actually flying to some degree. Weight does however make cornering sloppier and acceleration slower [:o] |
RE: Thunderboat speed and prop questions
Scott just brought up a good point. When a new class is started and it is one where speed records can be set in SAW and oval, there is someone who lays down a speed as a baseline and that person gets credit for holding a record.
Someone that I know has set many IMPBA records and he ran a boat at a record trial event in Flint, MI a few years ago where the boat was a slug but since it was a newly established class, he had another record to add to his already large list of SAW records. SAW doesn't mean a thing in real-world racing as those boats are set up to do one thing, go fast. Most don't turn for crap in SAW trim. Give me a boat that will do 6 laps, make it back to shore under its own power and I'm happy. Now, back to square one. What's a good prop for a stock Zen (with tuned pipe I'm presuming) for a Thunderboat? |
RE: Thunderboat speed and prop questions
ORIGINAL: Scott Schneider Just because ONE Owners of a Thunder Boat at a SAW event did 56.9, does not mean that there are not others with thunder boats going faster ? A SAW contest is a pissing match of the moment, maybe your fast that day, maybe not ? .... But in a class as new as the Thunder boats, he was the fastest that day in a class that had no pre-established record on the books. Weight has a LOT LESS effect on how fast a boat go's when talking "Air Trap" hydros that when trimmed right ride on a pocket of air actually flying to some degree. Weight does however make cornering sloppier and acceleration slower [:o] Ron as regards the best prop for a stock motor in a thunderboat id like to know that one too as my new one will have a stock motor,ive heard lots of recomendations from 6717/3 to prather 275 and quite a few in between.Another thing to take into account is which thunderboat your running because the zipps are smaller than most of the others.The lauterbach is 52" long compaired to the zippkits rockett at just47" and weighing arround 14-16 lbs so its also probably one of the lightest so possibly could be one of the fastest too. |
RE: Thunderboat speed and prop questions
The weigh did effect my cat, added 18 oz of the epoxy to its front for keep it nose down a bit, that helped a lot, as the results, the cat runs more stable now and won't flip over at all even on the choppy water at low to mid 70's, I thing I can bring it to race with other boats, but the issue is I last at least 2 mph of the top speed for this adjustment and never made it back no matter how I re adjust the prop height, my best prop is 2176 hight rake prop, before that I tried a few props on this cat like 6718, 6717, 6518 and all these only could run low 60's.
Scott, I have a question for you, if I send my mod engine back to the its builder to raise its intake and exhust timing, will this change would increase the top speed for a few miles? I known it would lose some low band torque but I wouldn't care about it. |
RE: Thunderboat speed and prop questions
Eric rather than add weight why not move the motor forward more if you have room? that way the boat is lighter yet hopefully more stable in chop etc?.I did that on a mono and it helped a lot and speed was better so you might keep your speed but have a more stable boat,sorry for going off topic guys.
Mart |
RE: Thunderboat speed and prop questions
ORIGINAL: martno1fan Eric rather than add weight why not move the motor forward more if you have room? that way the boat is lighter yet hopefully more stable in chop etc?.I did that on a mono and it helped a lot and speed was better so you might keep your speed but have a more stable boat,sorry for going off topic guys. Mart |
RE: Thunderboat speed and prop questions
ORIGINAL: rcboater, Scott, I have a question for you, if I send my mod engine back to the its builder to raise its intake and exhust timing, will this change would increase the top speed for a few miles? I known it would lose some low band torque but I wouldn't care about it. In most cases those who choose to go the "High Rev" route with engines are required to educate them selfs on the art of prop cupping. You need to find a prop the hull and engine equally like, then modify it for the increases in efficiency required to get the speed up to a higher place. |
RE: Thunderboat speed and prop questions
ORIGINAL: Scott Schneider As you readjust the power band of an engine, your loss's in torque and need in allowing engine to spool up harder will require using a prop of less blade area or diameter. In most cases those who choose to go the "High Rev" route with engines are required to educate them selfs on the art of prop cupping. You need to find a prop the hull and engine equally like, then modify it for the increases in efficiency required to get the speed up to a higher place. Mart |
RE: Thunderboat speed and prop questions
ORIGINAL: Scott Schneider ORIGINAL: rcboater, Scott, I have a question for you, if I send my mod engine back to the its builder to raise its intake and exhust timing, will this change would increase the top speed for a few miles? I known it would lose some low band torque but I wouldn't care about it. In most cases those who choose to go the "High Rev" route with engines are required to educate them selfs on the art of prop cupping. You need to find a prop the hull and engine equally like, then modify it for the increases in efficiency required to get the speed up to a higher place. http://www.props4u.com/prop_chart.htm |
RE: Thunderboat speed and prop questions
FYI eric,
Wally set the XLS27 cat record, using a QD in a dragcat for it. His SS engines didn't break the record. His sprint cat didn't break it neither. To answer the origonal question. Ken Dutlinger won the Cincy race with my 6518/3. So it's 2 votes for the 6518. Try it and see. ;) |
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