I need help with a ducted fan setup
02-14-2006 | 03:22 AM
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From: Portage,
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I need help with a ducted fan setup
I have a Royal cessna citation. It take the Kress RK20B fans. I am trying to locate some good engines to use with these fans. I have been leaning towards buggy engines. Has anyone ever done this before? I some of you guys could help get this powerplant together I would really appreciate it!!
-Matt
-Matt
02-14-2006 | 06:44 AM
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From: AlcesterWarwickshire, UNITED KINGDOM
RE: I need help with a ducted fan setup
02-15-2006 | 11:35 AM
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RE: I need help with a ducted fan setup
I had the kit, but never built it. I heard it flies fine. Typical Royal kit, makes a very nice airplane, if you keep the weight down. You can save a pound or two just by hollowing out all the blocks, changing the heavy sheeting for contest wood, and drilling lightening holes in all the many plywood pieces. Worth the effort!
The BEST engine for the RK20 is the OS25vrdf with the Mac's pipe. Better than the K&B. Hold out for a pair of those, they are not that hard to find, but worth finding.
MVVS and such, the ONLY place I have ever seen them used is on the Kress website. I have NEVER seen one actually flown in a DF configuration, it was not made for that. I have experimented with buggy engines, and you can spend a lot of money testing engines that are not ported and timed and set up for DF use, hedge your bets and get the OS engiens, they were made for it. The K&B are good but second place, but watch out, there are several different versions of the K&B, one is much hotter than the other....
The Toki fans won't put out enough for this plane.
You should also seriously consider 90mm electric fans.
The BEST engine for the RK20 is the OS25vrdf with the Mac's pipe. Better than the K&B. Hold out for a pair of those, they are not that hard to find, but worth finding.
MVVS and such, the ONLY place I have ever seen them used is on the Kress website. I have NEVER seen one actually flown in a DF configuration, it was not made for that. I have experimented with buggy engines, and you can spend a lot of money testing engines that are not ported and timed and set up for DF use, hedge your bets and get the OS engiens, they were made for it. The K&B are good but second place, but watch out, there are several different versions of the K&B, one is much hotter than the other....
The Toki fans won't put out enough for this plane.
You should also seriously consider 90mm electric fans.
02-15-2006 | 02:15 PM
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RE: I need help with a ducted fan setup
Hello,
I have built this jet and am waiting for better weather to test fly it. I would ditch the glowfan and get 2 HW620 electric fans from wemotec. the fans are smaller than the RK20 so they look more scale and with just about any electric motor they put out more thrust. I used 2 old graupner 930-10 brushed motors on 8s lipos. The thrust is 7 lbs and duration is better then 8 minutes. The other advantage is they always start in sync.
The plane itself is a bear to build and is typical of royal ( Carve balsa block to resemble plane, hollow as need for flight )
Derrek
I have built this jet and am waiting for better weather to test fly it. I would ditch the glowfan and get 2 HW620 electric fans from wemotec. the fans are smaller than the RK20 so they look more scale and with just about any electric motor they put out more thrust. I used 2 old graupner 930-10 brushed motors on 8s lipos. The thrust is 7 lbs and duration is better then 8 minutes. The other advantage is they always start in sync.
The plane itself is a bear to build and is typical of royal ( Carve balsa block to resemble plane, hollow as need for flight )
Derrek
