VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Main > RV General Discussion/News
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #11  
Old 11-04-2011, 08:29 AM
flyboy1963's Avatar
flyboy1963 flyboy1963 is offline
 
Join Date: Oct 2008
Location: Lake Country, B.C. Canada
Posts: 2,416
Default other options?

do a search for a couple of very smart guys from South America? they built a velocity type ship, with 2 auto engines, driving a single prop.
that's about as close to your requirements as you can get!

http://www.infortel.com/cozy/

oh, I see Velocity is also in engineering phase on a true twin pusher.
__________________
Perry Y.
RV-9a - SOLD!....
Lake Country, BC

Last edited by flyboy1963 : 11-04-2011 at 08:32 AM. Reason: add url link
Reply With Quote
  #12  
Old 11-04-2011, 08:45 AM
DanBaier's Avatar
DanBaier DanBaier is offline
 
Join Date: Mar 2009
Location: Rochester NY
Posts: 669
Default An old adage is

...that all the second engine does is take you to the scene of the accident.

Putting that aside, from a dollars and cents point of view, you'd be much better off looking for a decent Beech Travelaire (BE-95) or a Twin Comanche (PA-34 or PA-39). Both have Lycoming engines - the Travelaire with O-360s and the Comanche with IO-320s. I think the Travelaire is a little easier to land and perhaps a little faster, but the Comanche is pretty economical on fuel and with add on tip tanks and add on nacelle tanks, you can put on 150 gallons and fly about 8 hours with reserve at 160+ knots.

This all assumes that you don't have to deal with icing conditions - the answers change if you do. Just another point of view -

Dan
__________________
RV7A (N7101) - Flying 10/2008
CFI- SE/ME/Inst
A&P
KC2ZEL
Reply With Quote
  #13  
Old 11-04-2011, 09:53 AM
twsurveyor's Avatar
twsurveyor twsurveyor is offline
 
Join Date: Jan 2005
Location: Ridgetop, Tennessee
Posts: 134
Default RV with two engines and centerline thrust

Quote:
Originally Posted by RV337 View Post
I want to build an RV, but I want an RV with two aircraft engines and centerline thrust. .
Amazing how many people come up with ideas for a "Better Mouse Trap"!

One time I had a guy call me to come over to his house and look at his "mouse trap". He had a 14' jon boat with a big squirrel cage fan mounted to the transom. It was powered (via a fan belt) by a 10hp Briggs & Stratton lawn mower engine mounted atop the rear seat (his grass hadn't been cut in weeks). He was really proud of this thing but the real reason for having me over was, he wanted a copy of my RV-6 wing drawings so he could build a set of wings and make this thing a "flying boat"! I promise you folks, you can't make these things up!!!

Makes you wonder why Van don't think of things like this. NOT
__________________
Tommy Walker
Ridgetop, TN (1M5)
RV-6A, N 350 TW
830 Hrs & "Climbing?!

Last edited by twsurveyor : 11-04-2011 at 10:16 AM.
Reply With Quote
  #14  
Old 11-04-2011, 10:03 AM
aerhed aerhed is offline
 
Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
Default

I know where you can find a pair of twin comanche wings with spars already cut to fit an RV4. That's as far as the guy got. Watch out though, he does live in Texus.
__________________
Actual repeat offender.
Reply With Quote
  #15  
Old 11-04-2011, 10:15 AM
Michael White's Avatar
Michael White Michael White is offline
 
Join Date: Jan 2005
Location: Cartersville, Georgia KVPC
Posts: 945
Default

Quote:
Originally Posted by sailvi767 View Post
How much fun would a Rocket be with a lightweight 300 HP turbine in the front?

George
Is that a rhetorical question?

"The most fun you can have with your clothes on" comes to mind...
__________________
Moose
VAF #136
Reply With Quote
  #16  
Old 11-04-2011, 10:35 AM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
 
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
Default Welcome to VAF!!!!

John, welcome to VAF.

As to your question, here are a few things to consider.

I would think a 7 would be a better start than an 8, due to fuse length.

A rear engine is going to raise havoc with the C/G, and the shorter fuse of a SBS will mitigate some of that. You will still need to extend the front engine mount, I would imagine.

The wing structure will have to be re-engineered to carry the additional weight, the additional load of the tail boom attachment, the additional fuel capacity ETC.

The fuse will need to be re-engineered to carry the additional weight, the additional vibration issues will have to be analyzed and dealt with, and of course the landing gear will need a total re-design.

The tail volume will most likely not work with the reworked balance of the aircraft, and will need to be re-engineered also.

Not much RV left by the time you get done, is there?

Anyway, I am not an engineer, so my thoughts are only a SWAG, but you get the idea. Pretty sure I have missed a few things.

Thanks for the chance to do a bit of mental exercise

As I said before, welcome aboard.
__________________
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Reply With Quote
  #17  
Old 11-04-2011, 11:04 AM
mrblob's Avatar
mrblob mrblob is offline
 
Join Date: Feb 2006
Location: San Luis Obispo, CA
Posts: 159
Default Boomerang

Forget the centerline thrust idea, use two fuselages, and build it like the Rutan Boomerang. It has all of the benefits of centerline thrust with none of the disadvantages.

Paul
Reply With Quote
  #18  
Old 11-04-2011, 11:23 AM
Flyfalcons's Avatar
Flyfalcons Flyfalcons is offline
 
Join Date: Jul 2009
Location: Bonney Lake, WA
Posts: 295
Default

I don't even think my Lear can do 1000fpm on one engine and it does 5000+ with both operating. A piston plane doing 1000fpm on one engine just isn't going to happen.
__________________
Ryan Winslow
Reply With Quote
  #19  
Old 11-04-2011, 12:03 PM
cawmd82's Avatar
cawmd82 cawmd82 is offline
 
Join Date: Jan 2005
Location: Dallas
Posts: 302
Default Pots and kettles?

Quote:
Originally Posted by aerhed View Post
I know where you can find a pair of twin comanche wings with spars already cut to fit an RV4. That's as far as the guy got. Watch out though, he does live in Texus.
Hmmmm......Isn't the state of Wyoming symbol a Cowboy??

Sounds like a fun ride if you can thru the details-Maybe twin 0-340s would bolt up.
__________________
Chuck Wallace, M.D.
RV-8 "Free Bird" ECI O-360, Hartzell BAFP, All the cool stuff I can find......
N882Z

RV-10 N184KW Bought flying.....
Dallas, Texas
Reply With Quote
  #20  
Old 11-04-2011, 12:18 PM
aerhed aerhed is offline
 
Join Date: Dec 2008
Location: Big Sandy, WY
Posts: 2,567
Default

Quote:
Hmmmm......Isn't the state of Wyoming symbol a Cowboy??
Yeah, but don't blame me. In the thirties when tourism was really getting rolling here, the mayor of Cheyenne told everyone to dress more like "cowboys". He said "we don't want to just look like a bunch of farmers". Could be we took it too far. Sometimes its like living in a bad episode of Gunsmoke.
__________________
Actual repeat offender.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 06:46 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.