Bronco Type XXIII in 1/35th scale

[redboat219]

Notice you have more foam at the stern compared to the bow.

[redboat219]

Just another wild guess here.

Could the foam used to close the main induction flapper valve in the sail be causing the aft end to rise? Then again i bet you'll see this when you dive the boat and observe for any nose down trim.

[RCSubGuy]

Notice you have more foam at the stern compared to the bow.

There was also a long strip of foam along the entire length of the upper hull. The model was very statically stable as the righting moment it generated was very decent. You'll notice that I mounted the WTC low in the hull, below centerline. The keel weights were outside the hull along the lower keel, made from two big strips of metal (came with the 32nd Parallel kit).

[redboat219]

I also noticed that there are no guards in front of the bow planes.

[He Who Shall Not Be Named]

Just another wild guess here.

Could the foam used to close the main induction flapper valve in the sail be causing the aft end to rise? Then again i bet you'll see this when you dive the boat and observe for any nose down trim.

A consideration. However, dead in the water in submerged trim (only one-inch of sail sticking into the air) the boat sits dead level. But put some speed on and it goes nose-down.

M

[RCSubGuy]

Okay... so provided you shook the hell out of it and released any trapped air, we can eliminate trapped air as a cause. Have you tried locking the control surfaces like some others suggested and seeing what it does under speed in submerged trim?

Does the boat have the same tendency in surfaced trim?

[He Who Shall Not Be Named]

Okay... so provided you shook the hell out of it and released any trapped air, we can eliminate trapped air as a cause. Have you tried locking the control surfaces like some others suggested and seeing what it does under speed in submerged trim?

Does the boat have the same tendency in surfaced trim?

I have not locked the control surfaces zero-zero. Good idea. I'll give it a go tomorrow. That will eleminate a device problem as the cause of the un-commanded pitch-down.

M

[redboat219]

There was also a long strip of foam along the entire length of the upper hull. The model was very statically stable as the righting moment it generated was very decent. You'll notice that I mounted the WTC low in the hull, below centerline. The keel weights were outside the hull along the lower keel, made from two big strips of metal (came with the 32nd Parallel kit).

Maybe you could try this set-up?

[GNuge]

David,
I believe your problem stems from the size shape and location of the bronco stern fins. They are very chunky, do not have the negative angle of the real boats or like the old 32 Paraelle boat and they are not in line with the stern stabilizer. I believe removing them would be the best way to determine if this is the problem. Best regards.
George

[He Who Shall Not Be Named]

More food for thought. And thanks for that. Right now I'm up-to-here with production work. Something to consider once I get that beast back into the water.

M

[MFR1964]

David,

Just back from holiday, enjoyed the fine climate of Greece, internet over there was a nightmare, i could barely stayed tuned with the problems of your demon-like boat.
But something popped my mind, what about all those floodholes you made at your keel?, maybe they act like a waterscoop, forcing your boat going down at higher speed, the openings at the back of your boat near your divingplanes, they will behave like a waterjet propulsion, lot's of incoming water is present, scooped up by your surplus of flood holes, try to tape those holes shut, and run her again.

Since summertime is almost at it's end, i'll end up the works on the OSA II soon, and start to complete the XXIII, hang in there buddy!, we will get those XXIII's running!


Manfred.

[red_noir]

Any progress on this issue?




Chuck

[He Who Shall Not Be Named]

Any progress on this issue?




Chuck

Next week I hope. It's warming up around here.

M

[red_noir]

:) perfect, looking fwd to the results.


Just un boxing my bronco kit as I type this!


Chuck

[Warpatroller]

Next week I hope. It's warming up around here.

M

David,

I just sent you an email, regarding your fittings kits for this model. Just a heads up..

Steve