TopRCModel FW-190
10-28-2019, 08:40 AM
#601
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Location: Springdale,
AR
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10-28-2019, 05:37 PM
#602
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Since the radial is such a low vibration engine I decided that 4 cowl mounts will be plenty
10-29-2019, 12:00 AM
#603
Join Date: Jan 2007
Location: Dubai, UNITED ARAB EMIRATES
Posts: 487
Nice work, very neat. Is this the 125cc engine?
It seems to have a very short snout, requiring the engine to be mounted quite far forward. I cant help thinking that a longer prop hub modification would allow the engine to be mounted further back in the cowl and not have the problem of the rockers interfering with the cowl. I have seen the engine 'in situ' in the cowl, with no interference, but that is of course, without the offset taken into consideration.
Also, with the 125 being heavier than the FG90, it shouldnt affect the CG that much if moved back a bit... hmmm, I am going to have to think this through.
Nice to see your progress.
It seems to have a very short snout, requiring the engine to be mounted quite far forward. I cant help thinking that a longer prop hub modification would allow the engine to be mounted further back in the cowl and not have the problem of the rockers interfering with the cowl. I have seen the engine 'in situ' in the cowl, with no interference, but that is of course, without the offset taken into consideration.
Also, with the 125 being heavier than the FG90, it shouldnt affect the CG that much if moved back a bit... hmmm, I am going to have to think this through.
Nice to see your progress.
10-29-2019, 05:35 AM
#604
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AR
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Originally Posted by cathurga
Nice work, very neat. Is this the 125cc engine?
It seems to have a very short snout, requiring the engine to be mounted quite far forward. I cant help thinking that a longer prop hub modification would allow the engine to be mounted further back in the cowl and not have the problem of the rockers interfering with the cowl. I have seen the engine 'in situ' in the cowl, with no interference, but that is of course, without the offset taken into consideration.
Also, with the 125 being heavier than the FG90, it shouldnt affect the CG that much if moved back a bit... hmmm, I am going to have to think this through.
Nice to see your progress.
It seems to have a very short snout, requiring the engine to be mounted quite far forward. I cant help thinking that a longer prop hub modification would allow the engine to be mounted further back in the cowl and not have the problem of the rockers interfering with the cowl. I have seen the engine 'in situ' in the cowl, with no interference, but that is of course, without the offset taken into consideration.
Also, with the 125 being heavier than the FG90, it shouldnt affect the CG that much if moved back a bit... hmmm, I am going to have to think this through.
Nice to see your progress.
Last edited by n8622t; 10-29-2019 at 05:37 AM.
10-29-2019, 08:49 AM
#605
Join Date: Jan 2007
Location: Dubai, UNITED ARAB EMIRATES
Posts: 487
Jimmy, I think I will look into getting a new prop hub machined on there. It would likely need to be a hub with a design similar to a DLE type configuration in order to work, I am not sure if that will be as easy as one would think as it would mean adding a magnet for the timing...need to sit back and do some sort of design.
Thanks for your help.
Thanks for your help.
10-29-2019, 10:53 AM
#606
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AR
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Cowl mount area is reinforced and ready to drill
10-29-2019, 10:55 AM
#607
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Cowl mount area is reinforced and ready to drill
10-29-2019, 04:59 PM
#608
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AR
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Drill and tap
10-30-2019, 04:40 PM
#609
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Now to mount the cooling vents, clean up the rocker reliefs and blister, and baffle the engine
10-31-2019, 03:58 AM
#610
Join Date: Jan 2007
Location: Dubai, UNITED ARAB EMIRATES
Posts: 487
Looks good man! Are you going to be putting more cooling vents than the one at the bottom? The openings where the real plane's exhausts are, are pretty large, and them in conjunction with the louvre at the bottom...as well as baffling, might just be enough to get air moving through and removing heat...I would hope it is, as adding more vents is going to start taking away from the 'appearance'.
I am following dilligently as I am searching for ways to get this engine in without to much hacking. By the looks of it, moving the engine back around 1.25" might just negate the need to have the valve areas cut out....its marginal..
Great work, and i am SOOOO keen to see this plane fly with that 'lump' in it.
Andy
I am following dilligently as I am searching for ways to get this engine in without to much hacking. By the looks of it, moving the engine back around 1.25" might just negate the need to have the valve areas cut out....its marginal..
Great work, and i am SOOOO keen to see this plane fly with that 'lump' in it.
Andy
11-01-2019, 04:02 PM
#611
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Thanks Andy but I didn’t mention that the Germans were working on a new prototype 190 that never met production due to the end of the war....it had a 5 cyl radial
11-03-2019, 08:46 AM
#612
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Decided to add two smaller vents on top of cowl
11-03-2019, 07:14 PM
#613
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Location: Nashville, IN,
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From what I understand the vents like the ones you use are not very effective since the space is so small between the slats lots of interference drag as the air tries to figure the way out.
Sparky
Sparky
11-04-2019, 05:15 AM
#614
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Actually the vents are very affective....the openings are very large and the slats are angled as to create a negative pressure which reduces drag on the front side and easy air flow on the exit side, very affective
11-04-2019, 10:14 AM
#615
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That should be close to a 3:1 ratio of venting
11-04-2019, 02:06 PM
#616
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Now to brace and hot glue then a thin coat of epoxy on the baffles
11-04-2019, 08:04 PM
#617
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Join Date: Mar 2010
Location: Wading River,
NY
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So after flying mine all season, I have to say this has turned out to be one of my favorite airplanes. I put probably 60-70 flights on it and really have had zero issues with it. Its a superb flying plane with the DLE-111. I have Sierra main gear and the TOP RC stock tailwheel unit. I never could get the geometry on the pull pull cables correct on the tailwheel, so I ended up just locking it down.
11-04-2019, 08:05 PM
#618
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Location: Wading River,
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11-05-2019, 04:37 AM
#619
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That’s awesome...glad to hear it’s a solid bird
11-05-2019, 04:39 AM
#620
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EZ fit
11-05-2019, 06:10 AM
#621
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Time for the tail
11-05-2019, 06:21 AM
#622
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Here’s the tail wheel pull pull cable geometry:
mount the cable exits 3/8 inch above the forward tail wheel mount and there shouldn’t be any tension change in the cables
mount the cable exits 3/8 inch above the forward tail wheel mount and there shouldn’t be any tension change in the cables
Last edited by n8622t; 11-05-2019 at 06:25 AM.
11-05-2019, 08:10 AM
#623
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Thanks for the help Tim
11-05-2019, 08:34 AM
#624
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Drill your pull pull cables here and the cable tension remains constant...3/8 inch above the mount plate
11-05-2019, 12:56 PM
#625
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And I thought the cowl was a lot of work
