hi there everyone im after some help with a new project this is to be my first turbine im looking at the kolibri or the jjj not sure yet but im looking to convert my e-flight bae hawk to turbine i need a good way to fill the holes in in the bottom of the fuse also any good info would be apreciated as im new to turbines i have decided to go small as i now fly small 70mm edf jets and im limited to space where i can fly so i want to make this a complete build thread

http://www.e-fliterc.com/Products/De...ProdID=EFL8025

Jamie

I think the Hawk would not make a good conversion. The airframe is not that light to start with and adding tail pipe, turbine and fuel it will be heavy!

Dave Wilshere

do you mean the starting airframe weight ? or the finished weight as the plane is quite light and a 1.5kg finished weight and the turbine with fadec at 200 grams fuel i dont see how it will be to heavy ?

I have an Airworld Cougar EDF converted to the Lambert, it has twice the wing area of the EF Hawk. The EF Hawk EDF weighs 1300grams, I would not want another 200grams, plus I think the turbine conversion will end up heavier than 1500grams...

Dave W

ok thanks for the opinion so what does anyone else think i know of the guy from sincity jets is doing the same thing in the us in another thread he tols me of the project and he thinks it will be a good platform he is the importer of the kolibri so i was just wondering if there is anyone here that can asist with my build as this is my first turbine project

That is sound advice from Dave, not something you would want to attempt as a first jet project.

so any opinion of a better airframe i have also been looking at sapac composite l-39 or there baehawk or the ka models l-39 any sugestions

also please dont think this is my first model its just my first turbine i have only flown edf for the past 2 years and have flown many overweight planes i feel this airframe will suit the aplication 200 grams over aint bad when you double the thrust power to weight !!! its still a rocket now im unsure of the best way to either fill these holes or to simply put some metal mesh or whatever it is that you use

While it may not be a good first turbine project, it is a good airframe. It will take off heavier than the lipo version, but land lighter. It is also almost a pound lighter than the Falcon 25, which is a GREAT platform for the Kolibri.

The E Flight Hawk flies nicely, but even at EDF weight it will stop flying quickly, I just think it will be too heavy for that thin wing-someone can prove me wrong...

The L-39 would be better, Flaps and retracts plus a bigger wing

Dave

Actually, the Sepac Hawk would be the optimal Hawk platform. A little bigger wing and a GREAT flyer.

Another good candidate is the Mr. Boogie Hawk [link=http://www.rcgroups.com/forums/showthread.php?t=595117]70mm Hawk[/link]
It is large for a 70mm, and may very well be suitabe for the Kolibri...

Spar

thanks to everyone so far for the help so my only delema is that the ka models l-39 is only slightl larger wing area but has a removable wing and the sapac are fixed wing models but they have a larger wing area is there anyone that has done a sapac to turbine or now of anyone that hase done one?

Actually, Dave , I recently came across data that shows that thin wings can and do create just as much lift...the issue is that they do so over a smaller angle of attack range...I found that interesting cus i, too, assumed that thin wings didn't make lift.

so basicly you think the wings are just to small ? it seems to me that it would be fine but i dont know its all so up and down the main thing that im worried about is not being able to put retracts in the plane

Hi,
I recently bought a Twister (Multiplex) with Lambert turbine. On this airframe I put until now around 40 flights. The Lambert turbine is awesome, and the twister flies quite well (after some major modifications done by the previous owner).

What you should not forget is that those things must be flown like “true” jets, so they fly fast (and land also fast), you cannot make too tight turns and aerobatics and you have to consider the turbine spool-up time.
Here it comes the problem: those planes need a relatively big airspace to fly, but they are also so small that you have to keep them as near as possible if you want to see them…
I therefore would go for something bigger if possible.

Considering that I have flown only the twister bud I have seen live a Twinjet (with retracts) I would go for one of those because their simplicity. Simple to build, ready to fly in a couple of hours and relatively cheap. There is also a lot of experience on those airframes, therefore you can find a lot of precious hints for the building and set-up.
For the beginning I would also forget retracts and scale stuff. Go for something which allows you to fly a lot and avoid all possible sources of problems.

If it has to be scale I would go for the Aeronaut Panther (but it requires a lot of work, I followed the building of one of them) and the Viper of Schreiner as there is some “literature” on the turbine conversion.


Regards
M

yes i have been thinking that a bit i was thinking maybe going for the twinjet or something to get started

A kolibri powered twin jet is a blast! That thing is a bullet!