Thoughts on Delta Force 28 cat hull?

[hughb]

I'm interested in getting a Delta Force 28 cat. I already have a few of the more common cat hulls (Apparition, Zonda, Genesis) for which i already have plans to build as twin motor cats. However I'm looking for a cat to put in a big single motor for decent speeds (>60-70mph) while having the handling abilities to do some racing.

Would the DF 28 good for race and sport running? I also like the Aeromarine Mean Machine (they look exactly the same), is it worth the extra cost for being 1 inch longer? Can the hull handle a 40mm motor and 6s?

I've searched on this forum but couldn't find one reference to the DF 28 hull.

P.S. I know the cheetah seems a popular choice, though its out of stock at OSE.

[Old School]

This states a 29" Pathfinder

https://www.youtube.com/watch?v=fYTgEUK5P9c

[hughb]

Yeah that's very nice. Seems to get up and move!

[rol243]

If your wanting to race in P class its wise to go abit longer in length than say the 28 inch to something like 30 / 31 / 32 inch, the extra length does help alot in oval racing when water conditions start getting choppy. I know Deltaforce make good hulls as so Aeromarine but i feel aeromarine would be my pic for a racing cat.

[fweasel]

I have a TFL 27" mini zonda single motor build, setup for SAW runs. Its a fun boat, but that hull is so small and narrow, it needs ideal water conditions. In race water forget it. I would imagine a DF28 would not fare any better. The Cheetah is well known for stability in race conditions and an awesome turning hull. You can email Steven at OSE and see what the lead time on ordering a hull from TFL would be or try another TFL distributor in the US.

[HTVboats]

We used a DF 28 cat cut down 1 inch to run for the "N" oval record. In testing I found this hull works very well and turns decent with a 4S spec motor. I feel it is better in turns than the Mean machine which I also have. I haven't over powered the hull so I cant address any speeds above 55 mph. With a 40 mm motor it may go over 60 but won't handle turns. MY MM set the "P" oval with a 1512 and ran mid 60's. It still lost time in turns and couldn't run flat out there.
That said I like the DF and mine at 27" might be better at the 28" full length.
Mic

[hughb]

Thanks for the responses everyone. Still sitting on the fence...we'll see

[fweasel]

We used a DF 28 cat cut down 1 inch to run for the "N" oval record.
Mic

Mic,
Got any pictures of that boat? Would love to see the setup.

[rol243]

Just remember that a model running around in oval trim on its own will handle conditions alot better than the same model running in a race with other boats .

[hughb]

Thankyou for the input of everyone. I did end up going with the DF 28. I understand it may be small for racing, but I'll use it to practice my building skills and then to further my boat handling skills.

On another note, for a single motor cat hull should the propshaft/stuffing tube be centralised along the longitudinal axis of the hull, or offset slightly to counteract prop torque? As for the rudder, should it be offset to the right or left side of the boat? How far over should it be, closer to the centreline or more toward the edge of the boat?

[fweasel]

Offsetting the drive line is more of a mono hull tuning trick as those hulls pivot on that same axis. Single motor cats can still suffer from some torque roll, especially with narrow beams, but usually only while getting on plane. They are running on two ride surfaces once on plane and its not really an issue. Rudders are typically offset to the right due to the right hand turns in racing and interference with the both the prop thrust cone and physical interference with the prop itself. As for the amount of offset, at a minimum, it needs to be far enough over that the rudder will not hit the blades of the largest prop you plan on running, the rest is sorted with testing and tuning.

[HTVboats]

ca.jpgDF int.jpgDf2.jpg[ATTACH=CONFIG]158888[/ATTACH
Some pics of DF vs MM. I spliced one inch at the end of the first step and off the front of the cowl. For "N" it had a TP 3640/4700kv and a MGM 28026 and pulled 230-240 amps. Works much easier with a P spec. I would set up another DF28 over a MM. JMO
Mic

[hughb]

Awesome thank you guys

[hughb]

Doing some reading. In this build thread on a Cheetah hull they offset the driveline, but this is to compensate for propwalk.

https://forums.offshoreelectrics.com...hlight=cheetah

[hughb]

HTVboats,

Can I ask in Pic 4 of your post above what are the two blocks inside the tunnel? Is it for disrupting airflow to reduce lift?