Setup tips for a K&B 7.5 and DPI Tunnel

[crowebar]

Setup tips for a K&B 7.5 and DPI Tunnel

I've got an older K&B 7.5 that is stock and a DPI 7.5 tunnel. I put it together years ago but never ran it. I pulled it off the shelf today and want to go play. Here's my question. What's a good prop to start with. Also, What's a good motor placement? Up, down, neutral? Will it need positive or negative trim or flat?

Thanks in advance!

Dick Crowe

 

[Mike Hughes]

Re:Setup tips for a K&B 7.5 and DPI Tunnel

Dick

We have been running the 1450 back cut and pitch up. A good starting point would be a little below the sponson and neutral angle. Adjust to fit.

Mike

PS I hired on with a new crew this week. SME A commerial electric outfit.

No more unemployment checks for me.

 

[Ron Olson]

Re:Setup tips for a K&B 7.5 and DPI Tunnel

Dick, I have one, it's one of the first good ones out of the mold. A small adjustment makes a big difference in the set-up, it is a real touchy hull. When you get a good set-up on it, leave it there or you'll lose it, I know. The owners manual that I have really doesn't give any good advice, just the usual stuff as you know. I have 2 oz. of lead on each sponson tip and some on top of the radio box.

If you have trouble getting a fuel tank that fits well under the cowling, get one of Grimmy's 13 oz. Pyramid tanks, they fit great in there!

 

[[email protected]]

Re:Setup tips for a K&B 7.5 and DPI Tunnel

I had better luck w/an Octura X-447 three blade and the engine set at a neutral position w/mine.

If possible I'd buy some extra plastic from a hobby shop and plastic glue and reinforce the transom before the motor tears it apart.

 

[Jerry Dunlap]

Re:Setup tips for a K&B 7.5 and DPI Tunnel

Hold On Here!!!

This is "Mr. Go Fast With Electricity" asking questions about stinky, noisy, messy nitro boats??!!

Dick, for sport running just stick a X447 on it. If you don't have one, give me a call and we'll meet somewhere between my place and your house for a cup of coffee and a prop exhange.

Also, I suggest adding 4 - 5 oz. of lead to the front sponson tips.

Jerry D.

 

[crowebar]

Re:Setup tips for a K&B 7.5 and DPI Tunnel

Thanks Guys, That will help out.

I may take you up on the Coffee Jerry, more just to hang out then to get a prop off of you!

I started a little electric tunnel project and forgot how much I liked Tunnels. I still have my 3.5 and built that 7.5 but it never made it to the lake! I still hold that I'll make it out to the nitro races again. I've always liked Nitro boats, I just had to back off a little and be a dad the last few years. While that hasn't changed much (especially with 1 month old twins) I'll still plan on a comeback sometime, hopefully soon!

It might even have a little incentive if this 3.5 electric tunnel comes out as good as I think it will. With the advent of Brushless motors and 3300 mah battery packs I might just be able to hang with you guys on your course! Might be fun just to see!

I'll give you a call!

Dick