83turbo

So you're doing an EFI version of "granny's 4 rotor"?



You can probably split the CAS signal to both ECU's. Each engine should have its own MAF, etc.

j9fd3s

the ecu's wont "link" up though, they werent designed for that

83turbo

I guess I'm not totally clear on "link up". I'm assuming the two engines would have some kind of shaft coupling so they will be in sync. Then they should be able to share a CAS. What am I missing?

TLT

Thanks....I'll begin researching the 'splits', and yes, the 13B's would be hard-mounted together. And as for you "reality" folks.....despite the fact that I need this kind of power for my project, I have to answer first to a substantial mortgage, six large dogs to feed and a wife to keep happy, so money is not flowin' out my ears. In my experience, there are two ways of doing things.....set an unrealistic budget/demand and force the issue until you make it happen(which is how we got our 3000sqft stone home and 34 acres of Rocky Mountains), or throw money at it until it works. I'll take the first, thank you. I'll give you an example.......I'm building an aircraft; now the normal routine is to buy a "certified" Lycoming engine(a short-lived $35,000 180HP engine running just below detonation-point due to it's inherent design)and it is further assumed that I'm going to spend upward of ANOTHER $50,000 for some company-made "kitplane" instead of designing my own bird. But, through common-sense, dedicated research, a lot of backyard work, and ooodles of perseverence the skies are now filled with safe, scratch-built airplanes that are powered by everything from flat/inline 4's to V-8's to diesels & to, yes, rotaries, which are taking over the skies with each passing day and outperforming most of the "kitplanes". And throughout all these successful efforts, the flying "establishment" would ding these folks with things like "Why aren't you using a Lycoming?!" or "If it's scratch-built it, it can't be safe!" & my fav......."That little pony-keg of an engine won't even get it off the ground!" to wit virtually all have been proven wrong. My point here is that no matter what you are attempting(car, plane, boat, ect.), there are many paths & dismissing any one path out of hand is short-sighted at best. Elbow-grease, keeping an open mind and perseverence will finish my project, and it will not take an arm and a leg.

bill shurvinton

Twin engine cars have been running for a while in the UK, using bike engines, with a coupling box after the gearboxes. This makes for an easy solution as the 2 engines don't have to know about each other (in fact you can run with one engine off).



When they tried one engine driving front wheels and 1 driving rear then it got silly. Beat the record for 0-60 for a road legal car, but the MOTECs got very confused with corners.

TLT

A coupling box after the gearbox?! Interesting.....I'll have to explore that possibility. Thanks!

RETed

For someone who is bitching about their lifestyle AND wants answers for something most of us have very little experience with...you'd not asking for much, eh?



Seriously, you're going into unchartered territory for 99.44% of us, so be prepared for the snide remarks and rude comments. If you're that good and not blowing smoke, I'd say just go for it and keep us updated. It sounds like you have the resources and know-how to pull this off, and you really don't need our help from the peanut gallery with anything...



Good luck.





-Ted

FlukeSDS

I'm confused ... what's so "far fetched" about his idea?



Isn't the 26B from the 787B "basicaly" 2 13Bs put together? lol

75 Repu

the mention of the box uniting the engines was seen at seven stock.. the wide *** blue car with two t2 engines mounted side my side.. that could work.. why not e-mail atkins rotary about their plane stuff.. they may have played with this idea before..

TLT

I do apologize if I sounded like I was griping....actually I was just relaying that my lifestyle does not lend itself well to mounds of money, and as for this rotary "peanut gallery", I find it to be anything but! I've already gotten good feedback, and some other knowledgeable insights for my project, so if you don't mind too much, Ted, I'll keep inquiring.





Yes, there is an aircraft known as a Cozy that uses side-by-side inline 4's(Subaru's, I think)to individually drive contrarotating props, but in the case of my bird, the engines must be mounted tandem in order to fit into the fuselage, so either they work independently with one driveshaft system going up & over the second engine, or the two are hard-mounted together working as one. Some of my other research has led me to believe that twin-engine dragsters of the 80's and 90's had V-8 injection/blown engines that were linked this way, and I've put out e-mails to those folks. Nevertheless, I'd still like to hear thoughts on how an EFI system could possibly be split to monitor both at once......and if that's not possible...well, there are many other paths .





As I said earlier(and I'm not gripin' here, Ted), Atkins & other rotary aviation companies tend to work along very standard lines(I imagine for liability sake)& they don't like to even much talk about such matters, which is a shame. As to the 26B, I'd heard the same thing, but I'm certainly not the one to confirm.