Need ideas!

Thanks to a great friend, I have a rear exhaust BB 15 engine that I believe will work nicely for a small full blown stunt ship.
I can reduce current plans, or start from scratch.
What I want is suggestions for dimensions as to span, area, tail moment, etc.
The engine will be used in as close to a pipe run as can be achieved.
TIA
Bill <><

Re-fit it in your Ares!
Jim D.

LAST EDITED ON Oct-15-04 AT 01:39 PM (CDT)
 
Maybe a Lil' T-Bird. (??)
You know the 15 ain't enough for the Ares.
Bill <><

Bill;
When we are at Huntersville, let us have a conversation. I am developing a Staris for a Russian 15 as well as one for a Cyclon .051. I am also putting together a Debolt Continental for a Russian 15 combat ebngine ,the ultimate high rpm, low pitch setup.

All of the above will be run on bladder ,pressure fuel systems,with
the fuel system remaining hooked up to the NVA all the time and fueled thru a check valve at the back of the bladder. The fuel tubing will come from the bladder out the front of the plane and then back to the NVA and will be pinched off at that point to refuel. The bladdder will be refueled from the back thru a check valve at a line hooked to the rear of the bladder.
Busby

Hi Buzz
I can't throw the hat down this time............
But! I'll be there.
I am pretty sure the 15 I have will be a good engine, but not the level of the new Russian ones.
I am think, that's the problem, that a plane in the Lil' T-Bird, or built up Peacemaker would be right, or maybe a little smaller than that.
Just *might* have the Vulcan ready.
Bill <><

What .15? The problem is prop diameter. I'd try it on a NoblARF. PW used an old Wooley Cobra to test fly his .15FP's for the bomber project. I didn't get to see that fly, but asked if it would do more than fly level. Affirmative, but can't recall if it would do the pattern or not. If so, I'd expect it would be weather sensetive. NoblARF? Still Stuka? Wooley's Argus? Dolphin? Steve

Hi Steve,
The Gold Head Taipan BB 15 RE.
I know it's not as strong as many, but it should be stronger than the Old Foxes and OS, etc. I would think it is stronget than an FP15 also.
Would like to use an 8-4.
Bill <><

LAST EDITED ON Oct-17-04 AT 08:14 AM (CDT)
 
Bill, that sounds just like a little engine I once owned!! Years ago, I used a Taipan 19 side exhaust plain bearing with magic muffler in the 20 size MK Blue Angel R/C model. It was full house RC and is about 47" span. It had almost vertical performance on an 8 x 6 prop. The 15 should be great on the 8x4 or 8x6 prop. Forgot it was an RC version. Can you get a c/l venturi for it over there ok?

For those interested, this is the Taipan Bill is talking about.

A friend of mine has a very nice little stunter fitted with a Tiapan 2.5cc goldhead glow. We flew it today. It's called a "Lucky Lady" and it's built from a British kit bought in the early 1980's in the UK. The manufacturer was a mob called St Leonards!

Hmmm...... that engine looks very familiar!
Thanks, Dallas!
Venturi is no problem.
I have lots of possibilities for this engune, just have to decide which avenue to take. I'm sure it will be a good engine for my purposes.
Mr. Werwage designed the USA-1 to be able to fly on a little less power than the size dictated, so a derivative of that design is starting to stick in my head. I'm thinking a mid 40" wingspan (44"-46") might be the size I want to start with. I'll work to save weight where reasonable.
Thanks all!
Bill <><

Busby,

What you propose sounds intriguing. I have always wanted a CL Stunt model named "Ear Bleed," for what it would do to one's ears after a full day of practice flying.

I have a little bit of experience running a Stunt engine on a bladder, mostly done in response to an early test setup being referred to as "a solution to no known problem."

Model was a Zilch X, my current OTS model as a matter of fact, engine a Fox 35. (I have since reverted to a hard tank.)

I intended all along to use a fuel regulator, as originally developed by Norm McFadden for AMA Combat models. With input from P. Walker I quit using case pressure to drive the regulator, instead using a very light spring behind regulator diaphragm, and vented regulator to outside air pressure. As you may remember, Paul used a central bladder in his second B-17 and it fed four O.S. 15FPs, each with its own regulator.

As my model was set up to "trick" Don McClave who made above noted utterance, it was necessary to conceal all the extra stuff one needs to do in filling bladder as opposed to a hard tank. This involved a couple check valves, and I wish you much better luck than I enjoyed. While they would generally seal just fine, when they didn't it could be a real mess.

Incidentally, central to tricking Don was that all look normal for each flight. And so I used standard "ketchup pump" to fill the bladder; these pumps look wimpy, but only because it's just Stunt guys using them. They will easily fill even bladders made from Phil's (ferocious) material.

Also want to caution you that it may well be necessary to change bladders during contest days; it is not unknown to change the bladder prior to every single flight, as did PW there for a time. So don't get too much faith invested in bladders which are not easy to get to for preventive maintenance.

I am assuming you are placing bladder--we ex-Combat guys actually refer to them as "bags," thanks to input from Grand*rson--astride the balance point. Alignment fore and aft seems best, as we can much more easily deal with a shifting balance point, as per current practice, than we can in dealing with lateral balance shifting to the left during a flight.

Several of us will be very interested in the results of your work.

Uh, have you spoken with Larry Scarinzi (sic?!) yet? If not, you should.

Hey Bill!

How about the Mini-Brute? MAN, 9/79.

Designed for Fox 19-25, a modern BB 15 would probably drive it pretty well.

LAST EDITED ON Oct-18-04 AT 05:52 PM (CDT)
 
I flew an old timer, the Scared Kitten by Wild Bill, at VSC years ago. I used a C*x Conquest with a .25 venture, 5% nitro with 28% castor and a bladder(the Piston and Liner were new with about 5 or 6 runs on them) and a Rev-up 8-3 prop. The RPM was about 24K so the conquest was getting into it's power band. This is a Fox .35 sized ship with a nice thick wing 36" span I think, about the size of a VooDoo only with a stunt airfoil. I flew it on 60FT .012 lines and shortage of power was NOT a problem. It was kind of like what a pipe ship must be like it went the same speed no matter which way it was going. The Tiapan will be down a little but not much, I would try for a 8-3 though because the 8-4 may be a little quick.