> On 20 Apr 2015, at 7:51 pm, Peter Champness <[email protected]> wrote: > > I still like the single main wheel, preferably fixed. Simple, cheaper, robust > and can't land wheel up. Looks horrible, more drag, learn to do checks. > > Yes it is tipped over at the start of the take off, but wing can be raised as > soon as airspeed is sufficient. which might not take long with the wheel > motor. Unfortunately Australian airfields are covered in vertical relief objects such as marker cones, signs etc. and pilots can't be trusted to land on the big piece of bitumin with the dotted line down in the middle without these. > > Q4. Is the tail wheel stuck on? Seem s like this is a simulation at this > stage. Yep > > Turbofan required instead of turbo jet. Unfortunately nothing on the market > yet. No, turbo fan is a much more complex engine and much larger in diameter which defeats the purpose of the jet and will be much more expensive. Main advantage is propulsive efficiency which doesn't matter much in a self launcher as the engine doesn't run for long. Bigger turbojet ( or two) is better. Propulsive efficiency of Pawnee tow plane towing glider is about same as turbojet.( from POV of glider). About 10%. Yep I did the numbers. No point wishing for something that doesn't exist. Mike > >> On Mon, Apr 20, 2015 at 7:33 PM, Mike Borgelt >> <[email protected]> wrote: >> At 07:24 PM 20/04/2015, you wrote: >>> Thanks Mike, >>> >>> Q1. Main wheels are very close together. Would a wind tip it over? >>> Single main wheel and wing tip wheels might be better. >> >> >> Possibly, but single wheel means it is already tipped over. I've thought >> about 2 single wheels a little further apart. More complex mechanism. >> >> >>> Q2. Where is the jet air intake? >> >> >> Top of fuselage behind canopy. Pop up intake. >> >> >> >>> Q3. Is the jet thrust sufficient for climb out? >> >> >> >> >> Should be but I'd like a little more while preventing running the engine at >> more than 80% thrust for longevity and reliability reasons. >> >> My rule of thumb is Thrust weight or around .18 to 0.2 so you can get 0.14 >> to 0.15 T/W without running engine at 100%. >> >> Mike >> >> >> >> >> >> >>> On Mon, Apr 20, 2015 at 4:43 PM, Mike Borgelt < >>> [email protected]> wrote: >>> >>> VFMG members will have seen this already: http://www.proairsport.com/ >>> >>> Looks like PW-5 wings and tailplane, nicer fuselage and some really good >>> ideas. >>> >>> I've though for some time that dual wheels and electric taxiing are a great >>> idea although I'd have made it a taildragger with steerable tailwheel. >>> >>> Mike >>> >>> >>> Borgelt Instruments - design & manufacture of quality soaring >>> instrumentation since 1978 >>> www.borgeltinstruments.com >>> tel:  07 4635 5784     overseas: int+61-7-4635 5784 >>> mob: 042835 5784                : int+61-42835 5784 >>> P O Box 4607, Toowoomba East, QLD 4350, Australia >>> >>> _______________________________________________ >>> Aus-soaring mailing list >>> [email protected] >>> To check or change subscription details, visit: >>> http://lists.internode.on.net/mailman/listinfo/aus-soaring >>> >>> >>> _______________________________________________ >>> Aus-soaring mailing list >>> [email protected] >>> To check or change subscription details, visit: >>> http://lists.internode.on.net/mailman/listinfo/aus-soaring >> Borgelt Instruments - design & manufacture of quality soaring >> instrumentation since 1978 >> www.borgeltinstruments.com >> tel: 07 4635 5784 overseas: int+61-7-4635 5784 >> mob: 042835 5784 : int+61-42835 5784 >> P O Box 4607, Toowoomba East, QLD 4350, Australia >> >> >> _______________________________________________ >> Aus-soaring mailing list >> [email protected] >> To check or change subscription details, visit: >> http://lists.internode.on.net/mailman/listinfo/aus-soaring > > _______________________________________________ > Aus-soaring mailing list > [email protected] > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring
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