Building the new Bushbaby SAFARI

[Oupa-G]

Dear Myr every question you have asked I have answered to the best of my knowledge the windtunnel is just a joke and your comment about my garden I take as a compliment My garden is 1 hectar in size and is very beautiful. For the rest I'm just a home-builder that would love to have access to an engine Dyno and a windtunnel but not in this life. I enjoy your questions and if my humour is misunderstood then it is just cross cultural differences. I appreciate your search for the exact answers and when you have built your aircraft with the 260I then maybe one day we can fly next to each other and compare. The ultimate testbench is the air . Figures on paper are very often manipulated. Please keep on asking. I promise to give the exact figures as I test fly . The figures will not be manipulated. I tried to send this message through the PM system but I do not know how to use it so the answer is given this way.

Cheers Oupa-G

[t-bird]

Hi Oupa-g

Ek volg julle ontwikkeling met groot belangstelling.
Jy het op ‘n tyd gesê dat julle ‘n rotax met fuel injection het.
Ek stel belang om ‘n rotax te convert. Hoe maak ek kontak met julle.

Groete

Callie

[Oupa-G]

Hi T-Bird It is true there is a 912S already flying with an E-Boxi and the second one is being converted we are trying different throttle body configurations. The present inlet manifold's airflow is not ideal and we are trying out to run the front injectors at a different mixture then the rear ones ala GAMI injectors on the Continental and Lycoming engines. At the moment the EGT temp's are deurmekaar. On the first conversion we made a new inlet manifold with equal pipes and that engine runs sweet. Getting the correct size injectors to match the engine also requires experimentation. But yes there is something in the pipeline but not yet ready for the market.

Cheers Oupa-G

[t-bird]

Hi Oupa

I have a gyro project that needs an engine.

The Rotax 914 puts out 115hp which you only use when hot ,heavy and high for takeoff. Only important on short airfields with obstruction on the end.

What is more important to me is the 100 hp guaranteed by the 914 irrespective of altitude.

Would it be possible to turbo the BMW engine – Low pressure altitude compensator to maintain 100 hp ?

Regards

Callie

[German]

Hi Oupa G.How about a single injection system like on certain Uno s ,where they took the carburetor off and fitted a"injection carburetor"and then what if this single injector fails?

[Oupa-G]

At this stage we are looking at a reliable normally aspirated engine . I do not see the need for a single injection system the Vw in Europe played with that at the moment the cars go with a well designed inlet system and an injector per cylinder. Turbo charging is of course a natural partner in aviation if it only is turbo normalizing . I have turbo normalized my Vansin homebuilt with a manually controlled waste gate. You just do not overboost the engine then you can get 100hp at the reef. But let me first just get this engine past 500 hrs and then I will turbo compensate.Hope that answers the questions.


Cheers Oupa-G

[Mogas]

Hi Oupa-G
How is the higher hp achieved by BMW on the black cylinder RT GS1200 engine and how much more than the standard "silver" GS.
Thanks
Mogas

[Oupa-G]

Hi Mogas

YOU will be glad to hear that I'm into the tuning phase now and it is the new 3D software because of the variable pitch. Also there are minor refinements in the software. The refinements are wonderful that are there for smoother starting and also taking into consideration power dips etc . The box I'm tuning has the name Mogas written on it so a fully tuned box is coming your way. We are also playing around with temp senders to see which will work best , taking into consideration easy installation etc remember we need two of each. Coming back to your question the silver GS is 100hp The black body Rt1200 uses the same throttle bodies and the same injectors Ihave not researched the cams or the valve sizes but I will do that the higher hp is at a higher revs. But with the reduction we have you are still within the prop speed limit. The R1200S with 120hp has different throttle bodies with bigger inside diameter and different valves and cams but the same weight. Safari II is getting one of these engines. So my Safari will have 110hp and once we have test flown we will see the difference. With the variable pitch one can use the take-off power but we cruise at 5500rpm and we will quickly see how the available torque is at cruise. THE nice thing is with all the ground running the oil temp goes to 85C .The cyl heads are at a very low 95C so on the ground with all the testing the temps do not run away and that is only the prop blast working. That is all for this morning . I see the hits are over 29000 what a wonderful response. I will try to keep it interesting.

Cheers Oupa-G

[Low Level]

I have a gyro project that needs an engine.

Would it be possible to turbo the BMW engine – Low pressure altitude compensator to maintain 100 hp

Hi Callie

I also have a project in my garage, and was thinking along the exact lines. Therefore following Oupa's project with great antisipation.

[Mogas]

Thanks Oupa-G
We at KFA have aquired a black pot GS and will shortly begin our own "dual sport" GS powered Bush plane/Sport cruiser.
She will get the Mogas Eboxi

[Boet]

Had my daily call from Oupa late this afternoon, we both had a full, busy day, and kicked our heels up, and had an interesting chat about what we love doing most. AEROPLANES!! He is very happy with the progress made on the Safari, and the roar of the Bee Em regularly rattles the neighbourhood windows. Oupa is fine-tuning the E-Boxi, and is nearly there with it. The oil cooler and the cooling baffeling is obviously working very well, and even after prolonged static engine runs, both cyl head and oil temps are well within safe limits. Him and Jan have now come to the "short-list" stage of the build. Not so long to go now!!
My own Explorer is also progressing slowly, now with the wings and flapperons sprayed their final coat, also nearing completion. Stlll toying with the landing gear config. Taildragger or nosewheel??

[Mogas]

Taildragger or nosewheel??
Cummon Boet
You know you want one, your avatar says so!

[Boet]

Mmmmmm. I am waiting for a certain someone to make me a semi-free castoring tailwheel?? STILL vaitink............

[Oupa-G]

The other day I was in the Metropolis of Loeriesfontein and I happened to visit a good friend of mine in his workshop was a nosewheel of a Bushbaby I picked this up and I wandered who in his normal healthy mind would put so much weight on an aeroplane and then make it ugly on top of it. I don't know what the discussion is about the wheel should be at the back and a little training, period.

Cheers Oupa-G

[Boet]

Ja Oupa........mens stry nie met so n groot ou nie!!