Turboprops

[im-sad]

Are jet driven prop planes considerd a Jet or a Regular plane, for instance the Piaggo avanti has a jet that drives a prop, Im assumeing that most would categorize it as a regular plane righ??

[bigglesjets]

Hi Im-sad

Collins Dictionary :-)

jet , a aircraft driven by jet propulsion
jet propulsion, propulsion by jet of gas or liquid- jet propelled

http://i25.photobucket.com/albums/c77/bigaldix/si0522sm.jpg

Suppose it could pass as a jet,it would look the same with 2 brushless motors jetting it along!!!!!!!!!

HMMMMMmmmmm!

Cheers

Al

[bigglesjets]

Hi Im-sad

Hey ,on second thoughts that looks a really nice project, Anyone got plans

Al

[Roger Lombard]

All "jet" engines are technically gas turbines. Turbines are used to drive compressors which push compressed air into combustion chambers where the addition of burning fuel causes rapid expansion of the hot gas which is then used to drive the turbine and you're back to where you started. What you want to do with the "surplus" energy (in the form of hot gas) determines what you end up with. If you just let the hot gas go as a high speed high pressure gas stream you have a jet. If you insert one or more extra turbines into the gas stream which are coupled to a propeller you have a turbo prop (and no jet effect in the exhaust because all the energy has been soaked up by the power turbines). If you couple the power turbines to an electricity generator you have a gas turbine generator etc etc. In practice most modern commercial aircraft "jet" engines are a really a mix of ducted fan and jet. A significant proportion of the intake air is compressed by the big "fan" up front and is then ducted back around the engine (so not through the combustion process) to the rear where, relatively cool and slow in velocity, it mixes with the very hot and high speed gas coming out of the hot bit. Still a jet but quieter and more fuel efficient than a pure jet.

[bigglesjets]

Hi Roger

Thats the best explaination (layman type) I've heard yet! mate

Cheers
Al

[Broncomech]

To answer the original question a turboprop aircraft is simply a propeller driven aircraft (regular plane if you like) with turbine engine providing the power to turn the reduction gearing and propeller. Take the propeller off and the engine can not provide enough thrust to move the aircraft.
This type of engine was designed to produce mechanical energy (high speed low torque rotational force) to drive something, usualy through a reduction gear system as the turbine speed can be in excess of 40,000 RPM.
As mentioned above the energy can be extracted by use of an extra turbine or turbines which are not physicaly attached to the gas generator (free turbine) Pratt Whitney PT6 is one example .
The energy can be extracted directly from the gas generator shaft (direct drive) Honeywell TPE331 seres engines are one example, both engines drive an attached reduction gear to convert the high rotational speed to a lower speed and increase the torque to drive something.
The first thing that comes to mind when turbine engines are mentioned are aircraft but there are many other things that use turbines for power, ships, trains, tanks, cars, boats, and the list goes on.

[im-sad]

yeah i know how they work but could planes like the Avanti be put in this fourm?? I also know of the many other uses of turbo-drives, I saw on discovery channel a motorcycle powerd by a gas turbine, really cool.

back to the Q. As here is the fourm for airplanes that are jetlike but prop powered would a turboprop driven aircraft be moved to the , say.. fomies if it was posted here??

[RCParkflyer]

back to the Q. As here is the fourm for airplanes that are jetlike but prop powered would a turboprop driven aircraft be moved to the , say.. fomies if it was posted here??

That would be the Jets - Pushers Forum (http://www.rcgroups.com/forums/forumdisplay.php?f=237) :D

P.S. Your in it

[bigglesjets]

Hi Guys

hmmmm, Well! ummmm, errrrr!!!!!!!!, it looks like a jet guys? what do you think?


Al

[Tim H.]

Interesting question...

Broncomech hit it right on the head on the . I fly a BE1900D for a living. 1 PT6-67D on each wing. Almost 1350hp per side... The thing is a BEAST! But if I called it a jet, I'd get laughed out of a job...

Now, an Avanti IS a pusher, and it DOES have a jet engine... I think it would fit right in here... It looks fast just sitting still.

I say go for it! My 2 cents...

Tim H.

[bigglesjets]

Hi Tim
Now if I told a guy that flys D/F or Turbine jets that I fly jets, ummm with a prop on.
Now he would probably laugh at me.


Go for it

I like the Piaggio, anyone got any plans drawn up yet.LoL

Cheers
Al

[RCParkflyer]

Simprop Piaggio Avanti P180 ARF Kit (no longer in production)

http://www.hobby-lobby.com/images/si0522sm.jpg

Hobby Lobby doesn't sell it anymore

http://www.airalpha.com/upload/2003111710172075-avanti-large.JPG

FMS Simulator
http://wald.heim.at/schwarzwald/522450/AFPD_models.html
http://wald.heim.at/schwarzwald/522450/AS_Avanti_AFPD.zip

[im-sad]

OK if the avanti could be placed here i have a new Q.

If we made a F18 PJ, and stuck the motor to the nose it wont be out of place here. but say if we put a C-5 which has turboprops(i think) wouldnt it be moved to the foamies or parkflyers or whatever??

[RCParkflyer]

If you made that F-18, people would fly to indonesia just to take a hammer to that plane LOL a C-130 has 4 turbo-props, a C-5 is a 4 engine Jet.

[PhantomII]

Interesting question...

Broncomech hit it right on the head on the . I fly a BE1900D for a living. 1 PT6-67D on each wing. Almost 1350hp per side... The thing is a BEAST! But if I called it a jet, I'd get laughed out of a job...

Now, an Avanti IS a pusher, and it DOES have a jet engine... I think it would fit right in here... It looks fast just sitting still.

I say go for it! My 2 cents...

Tim H.

I used to work on the MUII and I hated the bird.....those D@!* garrett engines were to loudest things out there!!!

[im-sad]

oookayy, so will the c-130/5 be moved from this fourm if it was placed here??

[RCParkflyer]

I suppose it would, it depends on how the Mod's feel that day, I guess :D

[Tim H.]

I used to work on the MUII and I hated the bird.....those D@!* garrett engines were to loudest things out there!!!

MU2 = Widowmaker...

Hmm... Let's see... Let's put spoilers on it instead of ailerons. Maybe the low speed handling won't be affected TOO much... Yeah right...

MU2's SCARE me!!!!!!!!

[PhantomII]

MU2 = Widowmaker...

Hmm... Let's see... Let's put spoilers on it instead of ailerons. Maybe the low speed handling won't be affected TOO much... Yeah right...

MU2's SCARE me!!!!!!!!


Never rode in them.....never wanted too!!! I was glad when we got rid of them and got King air's 200, 350. I would much rather have a Merlin then an MUII!!!

[Tram]

I flew one for a few months.. :) I loved the moo-2.. :)

I think the Avanti would be either/or.. It's not a jet.. but.. it is a pusher.. and it sorta looks like a jet.. but is it truly a jet? Nope...

Tim - How's the 1900 treating you? I start J32 school in January..

[Tim H.]

Tram - It's been treating me very well... PIC turbine... I'm going to try to get my B737 type in Jan.

Tim

[alpapilot]

A few years ago in Newark (EWR) taxi times for most departing traffic was around three hours - very typical of "The Sewer". For those that don't know, EWR has two long parallel runways 22L,R and 4L,R. One is for departures and one for arrivals.

There is another runway that goes mostly purpendicular - 11,29. On this particular day all jets were departing 22R with the three hour taxis, but the turbo-props were departing 11 (which heads right to the Hudson and then past Manhattan) and getting off the ground in under ten minutes.

Now for the point of the story, I tried to convince flow control that I was not flying a jet that day but a turbo-prop with a really small propeller with a whole bunch of blades encased in an aluminum housing. Yeah, ATC didn't go for it, but it was worth a shot.

[im-sad]

but the fourm states :jet like aircraft not powered by edf units. The Avanti fills the criteria as everyone says that its : jet like , originaly jet powered, and a pusher.

The turbo prop is basicly a jet engine with an adittional prop on the front to provide thrust. so they dont use the jet 100% for power but they use the power of the jet to turn a prop to give power,

[RCParkflyer]

Finally Found it :)
Simprop Piaggio Avanti Video

www.parkjets.com/SI0522-PiaggioAvanti.wmv

Tom

[Tram]

I think the Avanti would slip into Pushers just fine..

However, a C-130, Dash 8, Jetstream 32, Beech 1900, etc in a "jet forum" would be a little silly.. They are simply not jets.. nor is the Avanti.. However, the avanti is a pusher, so put the Sugar Lobster wherever you like. :)

[jazsop]

l thought about kiting a Piper Meridian or TBM 700. Would work great do to its some what square fuselage and would use the wing from the bd-5 l am getting ready to release. l would just need to scale down the fuselage to mach the wing size. matt