Design > Stunt design

Heinkel 219

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ash:
I guess this is as good a place as any for this one...

I've been wanting to do a profile HE219 for Profile scale, but a Sea Fury will fill that role and I found this plan for an He219: http://www.myunclewillies.com/about5.html2.html (halfway down).
Walter Musciano, American Modeller - 11/12 1964

http://d94132.u23.simplenet.com/images/HEINKLE%20He%20219%2061ws/Heinkel%20219%2080.JPG

The joy of this one is that its the same scale as the Sea Fury, would make a fair standoff scale ship with servo throttle control, and is classic legal if I can get it to stunt passably (with disconnected throttles).

It seems somewhat bizarre to me that the plan calls for a pair of Fox .59s on a 61" craft, but there it is. I'm sure my pair of 25FPs would do just fine at a stuntable weight.

I haven't studied the plan thoroughly yet, but the main issue will probably be the assymetric airfoil section if I want the best of a classic pattern. There's a certain leeway to change that, but not by much. Weight is going to be the killer.

For now its firmly in the 'Maybe' list subject to mysterious Stunt Machine info becoming available.

If any of you have any experience with this He219 design or any thoughts to offer, I'm all ears.

ash:
Yep, weight is going to kill it. Further examination reveals only about 533 Sq inches of high AR wing. With two engines, two fuel systems, big scale wheels etc. 44 ounces seems a tall order. Looks like this one goes to the back of the 'maybe' list for the forseeable future. I need to get out of the habit of thinking its a good idea to make models that can enter in multiple events. One properly designed and built model to excel in one event.

Russell Shaffer:
The two Fox .59's might be just about right for a fast, level flight.  Should keep the lines tight, at least.  Russell

Ted Fancher:

--- Quote from: ash on February 27, 2006, 10:56:40 PM ---Yep, weight is going to kill it. Further examination reveals only about 533 Sq inches of high AR wing. With two engines, two fuel systems, big scale wheels etc. 44 ounces seems a tall order. Looks like this one goes to the back of the 'maybe' list for the forseeable future. I need to get out of the habit of thinking its a good idea to make models that can enter in multiple events. One properly designed and built model to excel in one event.

--- End quote ---

Don't be too quick on that decision, Ash.  533 squares  on a high aspect ration planform with two engines isn't necessarily undoable unless you get carried away with the scale details and/or use too much plywood.

One of my current "mind" projects is a twin Imitation which is about 620 square inches and I'd be perfectly happy if it came in at a bit under 60 oz with a couple of .20s  or .19s.  One of the neat things about twins is the large area of the combined prop disks.  They seem much more willing to haul the freight and can live with a higher wing loading than you might think.

If you could build it light and power it with a couple of OS .15 FPs you might be surprised.

Ted

ash:
Thanks for the input. The high aspect ratio would be a help, but one of the pre-requisites for any twin I build is that it use the two nice 25FPs I have already. My biggest problem is that I have too many "mind" projects as you put it... especially for classic stunt. Matching engines/plans/classes is a nightmare when there is only room to build one at a time!!

I'll definetly build an He 219 for the two 25s one day, but the question will be whether to build it pretty for F4B or profile scale or build it super light for classic stunt. Leading odds are with the original plan of doing a profile scale He219 and going with the little Hooptee for classic. There's a Rabe Bearcat plan yanking at my chain for classic though... If I had a spare ST46/60 lying around it would be a done deal ;D

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