Delta Force Mini Hydro running

**befu** · 11-21-2009, 12:55 AM

Runnign

OK, this bugger runs! the first time I tested it, it was windy with about a 1-2" chop on the water. I was running a 27mm prop and it ran well. had to keep it going as it didn't want to get up on plane other than a hand launch.

Next time I ran it on a 30mm platic prop. Run time was a solid 5 minutes. Again hand launch. Sitting still, it would dig the nose in and the rear would come out of the water! I learned a trick though. Goose the throttle, wait the rear to fall again and nail it, it pops up on plane about 1/2 the time. Anyways, rough water again but this thing ran like a offshore boat. It was jumping 3-5 feet at a time as it skimmed along. I couldn't believe it didn't blow over.

Today I ran it with a y531 octura purple prop on smoother water. It rocked! The video I am uploading stinks, but it shows the speed as I was zoomed way out. It rides really nice. The sponsons rock in WOT turns, but I took the hook out of the turn fin because I was having a hard time adjusting it not to act like a hydrofoil in the straights! you can hear it in the video, but some of it is wake action also. I taped the whole run, so it is 101MB video!

I really like the speed and solid 4 minute run time on a $10 battery! I hate the tape down hatch. Will have to work on that one.

Anyways, fun boat for $150 RTR with everything! Just a bit quicker than the Mini-v's

I will post video next when it is done uploading.

Brian

**befu** · 11-21-2009, 01:31 AM

video

OK, video fo the mini hydro running. hits the water at 0:15, I beach it at 4:25 as it was slowing down. Never hit the cutoff, but I have before. 4:10 of fast running on a 2200 battery. 60 / 4 = 15c x 2.2 = 33 amps. Not bad considering it was a 25 amp control with a 30 amp burst rating. Not even warm! Motor was cold, but it is rated for 45 amps.

On the 30mm prop I was getting 5+ min run time, so that lowers the amp draw down to about 25-26 amps. I also have some of the ss 40 amp controls, so maybe I will try 3s on that motor. Maybe not, that would be almost 40k rpm! Maybe I will try it, just prop down some first.

I am happy for a $150 investment. I think I have like 8 of those batteries!

Brian

**Rex R** · 11-21-2009, 05:06 AM

from what I've seen, a fair number of hydros require the 'two step' launch method(goose then punch). if it was set up to run the 427 prop, then the strut might need to be raised a smidge when running the larger props, say about 0.5 - 1 mm at any given adjustment. to me it sounds like the prop is running a hair deep.

**bustitup** · 11-21-2009, 10:39 AM

Originally posted by befu

OK, video fo the mini hydro running. hits the water at 0:15, I beach it at 4:25 as it was slowing down. Never hit the cutoff, but I have before. 4:10 of fast running on a 2200 battery. 60 / 4 = 15c x 2.2 = 33 amps. Not bad considering it was a 25 amp control with a 30 amp burst rating. Not even warm! Motor was cold, but it is rated for 45 amps.

On the 30mm prop I was getting 5+ min run time, so that lowers the amp draw down to about 25-26 amps. I also have some of the ss 40 amp controls, so maybe I will try 3s on that motor. Maybe not, that would be almost 40k rpm! Maybe I will try it, just prop down some first.

I am happy for a $150 investment. I think I have like 8 of those batteries!

Brian

WOW nice job of setting her up......I was wondering about the crooked install of the motor mount also but I got that boat from jesse and he told me he did that on purpose to help eliminate problems with torque

**wakeboardfusion** · 11-21-2009, 11:45 AM

Yeah, ive read that they are supposed to be like that also to help prop walk and torque. on a boat that size is the shaft about.25 to .5 inch off center if you measure on the stern?

**bustitup** · 11-21-2009, 11:52 AM

Originally posted by wakeboardfusion

Yeah, ive read that they are supposed to be like that also to help prop walk and torque. on a boat that size is the shaft about.25 to .5 inch off center if you measure on the stern?

I know J has lot of builds under his belt and a lot of lake time....I trust his judgment

is our cabin on the lake ready yet J?

**Jesse J** · 11-21-2009, 12:05 PM

I must admit I learned that trick on my first FE build - Garry Finlay plans and direction from Andy Kuntz... Two who have a few more builds on their record.

As for the cabin... Its done, I just need some help with the dock. I was thinking a two level one, where the lower one is 1/10 ish scale and has a strip of magnets. That way when the boats come in their metal gunwales hookup and hold them there... i.e. have the dock give the boats a big

Yes hydros are not cats are not deep vees. they bein flat and turn flat need to deal with that prop walk scooting the back end to the left thus effectively making the boat want to turn right on the straights. If you off set the drive train to the starboard, or centered but 1-2 deg clockwise you should negate propwalk.

**Rumdog** · 11-21-2009, 02:28 PM

This little guy sure is getting around! It was my first build and has been through lots of different setups! I used to run 3s on a feigao 380 8L. It was insanely fast! I custom made that turn fin and bracket myself. Jesse had re-done the motor mount after he bought it. Yhe way i had it it was not adjustable for drive angle. I did set it up with the motor/ strut offset to the starboard side to counter act the propwalk, but it looks like she's running good for you!

**Rumdog** · 11-21-2009, 02:31 PM

Try running the battery lengthwise in the hull all the way over to the port side. It'll help it run flatter in the straitaways.

**Jesse J** · 11-21-2009, 02:34 PM

right, and also helps counter act torque roll. It seems to be getting better the more it is passed along!

**befu** · 11-21-2009, 04:16 PM

Good ideas.

OK, the strut didn't change, I only moved the motor mount over so it would fit under the cowl with the turnigy motor. I angled it slightly to get a nice smooth driveshaft line to the strut.

From the rear of the sponsons to the prop, it is 11". As I ran it, the COG was 1.62" back from the sponson. Moving the battery lengthwise as shown below moves the COG back about 1/4" to 1.88" from sponsons.

The other picture shows the hull as I ran it. Both front sponsons are sitting on the bench, as well as the bottom of the strut. Definately looks like the transom is higher.

Thanks for all the input. This boat rocks except for the dang tape down hatch.

I am going to build a 1/16 shovel nose this winter. Will have to work on making that one non taped. I know, trouble with water but I will work on it.

Attached Files

**bustitup** · 11-21-2009, 04:21 PM

I shouldnt have sold that boat....but I couldnt get my fat little fingers in there to work on it

enjoy it befu

**befu** · 11-21-2009, 04:21 PM

Jesse

Originally posted by bustitup

WOW nice job of setting her up......I was wondering about the crooked install of the motor mount also but I got that boat from jesse and he told me he did that on purpose to help eliminate problems with torque

So, this was originally set up by Jesse. Hmm, it seems I am liking more and more of his boats. Great, now it will seem like I'm a stalker.....

Not sure if I will keep it or not after the 1/16 shovel nose. I will if I can get a standard hatch for it that bolst down with a couple of thumb screws.

Brian

**befu** · 11-21-2009, 04:23 PM

I feel your pain...

Originally posted by bustitup

I shouldnt have sold that boat....but I couldnt get my fat little fingers in there to work on it

enjoy it befu

Yeah, I am 6'5" and 265 pounds. Not exactly petite!

Brian

Delta Force Mini Hydro running

Delta Force Mini Hydro running

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