Paddy.....just a suggestion here. I would turn the brackets on your trim tabs reverse from the position in the picture. It would allow more positive movement than what is allowed in the picture.
70 mph DF 33
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How are you going with your two DF's?Last edited by Xzessperated; 11-18-2009, 11:18 PM.Several boats in various stages of destructionComment
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Douggie, the fool on the hillComment
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Got it, thanks, and a good suggestion. In my wee world I think that trim tabs are mounted flush with the hull and you make adjustments from that point, if they are required! I use them on some hulls, but not all
DouggieLast edited by Flying Scotsman; 11-18-2009, 10:15 PM.Comment
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I recently traded my DF29 ( that hit 70 ) for a DF41 copy. I was curious to see the quality of these hulls and I do have to say they are well made. My boat was traded in the swapshop with Phil Munsterman. His boat was set up by Ray Fuller with all CNC hardware. I will be reconfiguring all the hardware and layout of the interior. The DF33 is coming along very well. I have worked the bugs out by trimming the Speedmaster stinger back 5/8" and cutting 3/4" off the rudder. Setup on the DF33 is similar to yours just alot more power. DF33, Neu 1521 1y, PQ 6s2p, M545. I finally stopped the chine walking and am working on keeping the boat on the water with neutral trim and negative drive angle.
Douggie....Rumdog is spot on with the answer. Glad to help* BBY Lift Master RIgger * Insane Gen 2 Cat * Aeromarine Avenger Pro Twin * Delta Force Cyber Storm * Delta Force 41" Mono * H&M Viper II * H&M Intruder * OSE Raider Hydro * Whiplash 20 * Brushless Mini Rio *Comment
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I learned as a newbie that just because the tabs are neutral, that doesnt mean it will have zero effect on the hulls running attitude. I had a little chine walk when I first started dialing in my Titan. When I went a half turn positive on the tabs, all was good. Now when I dial in a hull, I start a turn or two positive and work my way down. I know Dougie and you other guru's already know this. I'm just bringing it up for guys that are starting out. Attached is a pic with the tab bracket mounted upside down. I did replace those screws with SS and locking nuts.Attached FilesMike Chirillo
www.capitolrcmodelboats.com
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Paddy,
I have in my collect of props Y536 (have not tried this yet) all props are S/B
X442 ( have no runs )
X637 ( have no runs )
X640 ( have no runs )
X642 detongued (ran this prop )
X645 ( ran this prop )
M445 (ran this prop )
Unfortunately I have not measured my speeds with these props. Need to get a GPS soon. My setup is for mostly sport running. Batteries are 5S2 Lipos 25C 4200MAH (these are about 2 years old with maybe half a dozen runs on them, brand name unknown! made by a friend who was into E-Helis at the time. I don't run trim tabs as the boat has a deeper Vee than the reg DF hulls. And she runs really well without them. I think I have had good speeds from the last two props. I am thinking of even going to a X450.
Neal,
What prop are you running?
What speed are you getting?
Have you an oval setup or a SAW setup?
Do you have a pic of the transom hardware you could share with us?
Can you give me more info on your batteries? I think you run 5s2p but what C rating and how old are they?
How have you got your trim tabs setup? Mine are above the bottom of the hull and only touch the water if the nose lifts a little.Attached FilesLast edited by westbeach; 11-18-2009, 11:48 PM.HPR115 x2 ,Dark Horse Shovel, Delta Force CyberStorm, Delta Force Sniper 23-RTR:Comment
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Paddy, I will take better pics of the transom, but the stinger is from Ray Fuller, and the rudder is from OSE. Turn fins are made from al. extrusion and sheet metal for the fin. My motor is laid out fwd towards the bow BTW. Battery pack sits towards the transom.Attached FilesHPR115 x2 ,Dark Horse Shovel, Delta Force CyberStorm, Delta Force Sniper 23-RTR:Comment
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Nice work, maybe the cupping makes the difference!Twin Cat 135, Sprintcat40 (single-twin), DF 35", Maritimo, Mean Machine, SV 27
http://www.rcfastboats.com/Comment
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Cupping makes a big difference. Usually will also increase lift of the hull. Working the LE also makes a difference.
Bill Seebold Sr. did some work on my SS raker I run on my bassboat and wow...a little cup and LE bending and I can sure see the difference in the lift. Lost some RPM but she gets there...just take a bit longer.
I picked up 5 mph but takes longer to get her to top out.Comment
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Cupping makes a big difference. Usually will also increase lift of the hull. Working the LE also makes a difference.
Bill Seebold Sr. did some work on my SS raker I run on my bassboat and wow...a little cup and LE bending and I can sure see the difference in the lift. Lost some RPM but she gets there...just take a bit longer.
I picked up 5 mph but takes longer to get her to top out.
Please correct me if I am wrong but I think cupping concentrates the cone of water coming from the prop. At a guess I would say the rooster tail is not as high because more of the water is tending to go directly behind the boat and not rising in the air. To tell you the truth I was not looking at the rooster tail while the boat was at that speedSeveral boats in various stages of destructionComment
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From what I read only (not tried yet) that's correct. Narrows the thrust cone and increases thrust.Twin Cat 135, Sprintcat40 (single-twin), DF 35", Maritimo, Mean Machine, SV 27
http://www.rcfastboats.com/Comment
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