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#21
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Bonus Jet glider demo weekend
I think a turbo prop would be ideal for smoothness and better fuel
efficiency. I don't guess a small light turbine powered prop has been developed. |
#22
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Bonus Jet glider demo weekend
On Apr 25, 9:50*pm, Mark Jardini wrote:
I think a turbo prop would be ideal for smoothness and better fuel efficiency. I don't guess a small light turbine powered prop has been developed. The model airplane guys have developed working turboprop engines though possibly not at the scale we need. The little turbojets have many advantages starting with their simplicity, small size and low residual weight after the fuel is gone. Adding a prop adds complexity and weight of a gearbox while reducing the "self-retrieval" speed. |
#23
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Bonus Jet glider demo weekend
On Apr 25, 8:50*pm, Mark Jardini wrote:
I think a turbo prop would be ideal for smoothness and better fuel efficiency. I don't guess a small light turbine powered prop has been developed. Ah I don't thinks so. The gear reduction, drive and prop retract and/ or folding mechanisms and need for a belt or high mounted jet engine are all likely horrible complications. The sorts of current motorglider complications we want to get away from. BTW there are small jet turboptops in use for models etc. (e.g. http://www.jetcatusa.com/spt5.html). Darryl |
#24
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Bonus Jet glider demo weekend
On 4/25/2011 8:50 PM, Mark Jardini wrote:
I think a turbo prop would be ideal for smoothness and better fuel efficiency. I don't guess a small light turbine powered prop has been developed. The company that makes the turbine used on the BonusJet makes a turboprop version. -- Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me) |
#25
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Bonus Jet glider demo weekend
Is there any danger to the vertical stabilizer from the exhaust heat?
I asked this of the owner of the Silent jet and they said that the skin temperatures were "within tolerances". Hmmmm. I just worry that given enough time the heat may affect the structure of the tail (glass? carbon fiber?) with the potential of loosing the tail. While I might be able to live with loosing a rudder, loosing the elevator is a whole other matter. If this was a conventional tail, rather than a T tail, there would be an additional safety factor. Are there other aircraft with a configuration like this? All I can think of are private, commercial or military jets in which engine heat is definately not directed against an airframe member. I believe that safety dictates adding a metal heat shield formed to the shape of the vertical stab. This would include a thin air gap (glued on non-metallic blocks) so no heat would transfer. Pretty simple to create and install. This wouldn't decrease the performance of the glider to any great degree (or any at all?) as the vertical fin is a non-lifting surface (might affect rudder performance?) - - but would greatly increase my comfort level. I can hear those infamous last words now, "Don't worry, we've never had a problem." ;-) John "My $0.02 of Safety" DeRosa |
#26
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Bonus Jet glider demo weekend
On Apr 26, 9:57 am, ContestID67 wrote:
I just worry that given enough time the heat may affect the structure of the tail (glass? carbon fiber?) with the potential of loosing the tail. While I might be able to live with loosing a rudder, loosing the elevator is a whole other matter. If you were losing the tail, rudder or elavator, it'd be a problem. Loosing it, though, it'll probably just rattle... -John |
#27
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Bonus Jet glider demo weekend
The BonusJet's fuselage was post cured at the TsT factory to 200
degrees F. Data from the engine manufacturer PBS show the radiant heat at various distances from the exhaust. Using the data, Bob determined that an exhaust splitter would be necessary. PBS manufactured a special exhaust that split the heat plume 6 degrees per side (12 degrees total). Subsequent testing with the engine at full throttle on a 95 degree F day, using heat sensitive tape labels on the vertical and horizontal surfaces showed a maximum temperature of 145 degrees F, well below the 200 degrees that would subject the tail to deformation and/or damage. BTW, the poster that was concerned about a "bomb" on board undoubtedly rides his bicycle or walks to the airfield if he is concerned about travelling in a vehicle that actually carries (gasp) fuel on board. Like every vehicle on the road. And the aircraft that tows him up. |
#28
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Bonus Jet glider demo weekend
At 14:23 26 April 2011, jcarlyle wrote:
On Apr 26, 9:57 am, ContestID67 wrote: I just worry that given enough time the heat may affect the structure of the tail (glass? carbon fiber?) with the potential of loosing the tail. While I might be able to live with loosing a rudder, loosing the elevator is a whole other matter. If you were losing the tail, rudder or elavator, it'd be a problem. Loosing it, though, it'll probably just rattle... -John I believe that Bob has that data on his website mentioned earlier but I remember that it reached a max of 140 degrees in testing and his glider was post cured to past 200 so should not be a factor, also it mainly seems to hit the tail much lower than the horisontal stab and didn't effect the controlability at all. In fact I enjoyed the flight soooo much that if I hit the lottery tomorrow Id have Bob working on putting one in a New Duo disci tomorrow! I truley felt that the reliability, power and simplicity made this a nobrainer! For most of us, we would be taking off once in the morning and flying most of the day landing back at night without power. This would limit the noise factor at your local or private airport. Doing Touch and go's probably wouldn't make friends but once a day should not be much of an issue. I took off my headset while under full power and again at reduced power and, from inside, its a lot less noisy than I imagined and way less than a mooney or cessna. Now if I could only put one in my Ventus B for less than the airplane was worth CH |
#29
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Bonus Jet glider demo weekend
I can't wait to hear about the JS-1 turbine installation. Once again
I dream of a lottery winning that would precipitate a quick order to Jonkers and a delivery to Bob Carlton for a Turbine upgrade. Or would it be a Duo discus XLT without the lawn mower engine. I guess the Bonus sailplane would be fine although I would not consider it my dream ship. Having the TBO raised from 300 hours to 2000 hours really gives strength to the quality and capability of these turbine engines. I wonder what the risk of a engine bird strike might be? Since I have yet to hit any bids, it is probably pretty low. Congrats Bob on being a trailblazer in a time of economic depression with a weak currency. I wonder if there has been any interest from over seas. Cheap dollars make our products a deal in Europe. I guess my only hope now is that Bob sells a bunch of Turbines which might make them available on the used market in 20 years at price my wife might think is not completely insane. Something about a toy airplane costing more than our house sours the discussion of my dream ships. John Ackerson |
#30
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Bonus Jet glider demo weekend
why wait .....the 304S Jet is being built and delivered now with a proven
turbine sustainer. HpH is well ahead of the game now years ago went through the testing similar smaller turbine engines that most other manufacturers are just now testing only to move on...there's one here now and will very soon be (in the next 30-60 days) be two more 304S Jets flying in the US alone ...there are now something around 25 304S sailplanes sold. tim "Dr. John" wrote in message ... I can't wait to hear about the JS-1 turbine installation. Once again I dream of a lottery winning that would precipitate a quick order to Jonkers and a delivery to Bob Carlton for a Turbine upgrade. Or would it be a Duo discus XLT without the lawn mower engine. I guess the Bonus sailplane would be fine although I would not consider it my dream ship. Having the TBO raised from 300 hours to 2000 hours really gives strength to the quality and capability of these turbine engines. I wonder what the risk of a engine bird strike might be? Since I have yet to hit any bids, it is probably pretty low. Congrats Bob on being a trailblazer in a time of economic depression with a weak currency. I wonder if there has been any interest from over seas. Cheap dollars make our products a deal in Europe. I guess my only hope now is that Bob sells a bunch of Turbines which might make them available on the used market in 20 years at price my wife might think is not completely insane. Something about a toy airplane costing more than our house sours the discussion of my dream ships. John Ackerson __________ Information from ESET NOD32 Antivirus, version of virus signature database 6072 (20110426) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 6072 (20110426) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com |
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