1/96 Project 1710 Beluga

[HardRock]

In eager anticipation of the arrival of the NEW SD from Dave, I have been finalising the gearbox design for the contra-rotating props. This is it.





There are two ways to go here. Either a series of bevel or mitre gears like this set up, or a gear cluster using double gear cogs. The former is simpler the latter is better - if you can find the approipriate cogs. I couldn't get hold of the damned things so this is what I'm going with. And it works incidently. I'll cast up some props tomorrow and report back (from the hospital, probably, where I will be recouperating from the third degree burns). I love this hobby.

[HardRock]

"brain stroke" Ho, ho, ho.

[HardRock]

... dibs on 'the Good'.

I guess that makes Bart, "The Bad" then. I've got dibbs on the "The Ugly", just ask Her Majesty!

[He Who Shall Not Be Named]

That is smart David.....those things are so obvious once you have catched them....but so hard to spot.

grtz,
Bart

So true Bart. I don't design as much as bump into things. If there is any 'skill' to this, it's the ability to separate the chaff from the wheat. There are so many wrong turns till the right path reveals itself.

David

[bwi 971]

That is smart David.....those things are so obvious once you have catched them....but so hard to spot.

grtz,
Bart

[He Who Shall Not Be Named]

I'm working up the little SD's for you, me and Bart. While doing that I had a brain stroke ... er .... brain storm: replace the low pressure blower (LPB) electronic switch with a mechanical one working off the ballast sub-system servo? Cheaper, easier, and frees up a receiver output port.

As you can see, the same limit-switch support is applicable to the entire range of SD sizes:















David

[He Who Shall Not Be Named]

mmmmm......how about The Good, the Bad and the Ugly then.......

Grtz
Ugly

... dibs on 'the Good'.

[bwi 971]

The Three Musketeers? Wait a minute; I don't think there was much thinking going on with those guys. The Three Amigos? Nah, Bart will think that an amigo is some kind of tropical fruit. I have it; the Three Grumpy (Old) Farts. Bart can join now and add the "Old" when he gets his quals finished.

(in the voice of an action-movie announcer) Their hell fed evilness spread equally across the globe! There is no escaping them! Their objective: WORLD DOMINATION! (cue the Imperial March theme).
David

mmmmm......how about The Good, the Bad and the Ugly then.......

Grtz
Ugly

[He Who Shall Not Be Named]

The Three Musketeers? Wait a minute; I don't think there was much thinking going on with those guys. The Three Amigos? Nah, Bart will think that an amigo is some kind of tropical fruit. I have it; the Three Grumpy (Old) Farts. Bart can join now and add the "Old" when he gets his quals finished.

(in the voice of an action-movie announcer) Their hell fed evilness spread equally across the globe! There is no escaping them! Their objective: WORLD DOMINATION! (cue the Imperial March theme).

David

[HardRock]

The Three Musketeers? Wait a minute; I don't think there was much thinking going on with those guys. The Three Amigos? Nah, Bart will think that an amigo is some kind of tropical fruit. I have it; the Three Grumpy (Old) Farts. Bart can join now and add the "Old" when he gets his quals finished.

[He Who Shall Not Be Named]

After some thinking (gasp!) I switched the BALUGA cylinder from a 2.5 to a 2-inch diameter unit. It gives me the length to produce a ballast tank of nearly twice the capacity needed to get this model up to designed waterline. And the smaller diameter presents little of the ballast tank above designed waterline, so not much wasted buoyancy with the smaller diameter system. I've already cut cylinders and have sized the bulkhead for three units. One for Scott, one for Bart, and one for me.

David

[He Who Shall Not Be Named]

Yes it's for Scott's lovely BELUGA....no way around....I have to squeeze her assembly in.

grtz,
Bart

Good. I'll get two birds with one stone -- I'll put together both yours and Scott's SD's this week. E-mail me your shipping address.

David

[bwi 971]

It's a 2.5" diameter cylinder. Is it for Scott's little BALUGA? If so I can put one together quick and get it off to you. If it's for another boat I need to know the maximum length of cylinder I can get into that boat and how many ounces of water the ballast tank has to hold. I'll take it from there. I assume you need a single-shaft version?

David

Yes it's for Scott's lovely BELUGA....no way around....I have to squeeze her assembly in.

grtz,
Bart

[He Who Shall Not Be Named]

Can you give the specs on that SD David, I will need one in the future.

grtz,
Bart

It's a 2.5" diameter cylinder. Is it for Scott's little BALUGA? If so I can put one together quick and get it off to you. If it's for another boat I need to know the maximum length of cylinder I can get into that boat and how many ounces of water the ballast tank has to hold. I'll take it from there. I assume you need a single-shaft version?

David

[bwi 971]

This is the finished boat. Add SD and some weight/foam for balance and off she goes.

I'm catching up on the forum, darn she looks good Scott.
grtz,
Bart