replacing spoiler on rpod 179 |
Post Reply | Page <123 |
Author | |
GlueGuy
Senior Member Joined: 15 May 2017 Location: N. California Online Status: Offline Posts: 2654 |
Topic: replacing spoiler on rpod 179 Posted: 31 Aug 2019 at 9:23am |
IIRC, Stephenh had tried the Purpleline Aero. I don't recall whether he felt it provided any benefit or not. Kind of noodling out loud is whether a reverse spoiler would provide any benefit? Something that was actually curved downward and sitting above enough to encourage the airstream at the back of the R-pod to stay attached long enough to fill the vacuum bubble.
|
|
bp
2017 R-Pod 179 Hood River 2015 Ford F150 SuperCrew 4WD 3.5L Ecoboost |
|
offgrid
Senior Member Joined: 23 Jul 2018 Online Status: Offline Posts: 5290 |
Posted: 31 Aug 2019 at 11:35am |
Thanks furpod,
Yah, I was only being half serious there. But I do think lots of folks (myself included) think that the teardrop shaped front ought to be better aerodynamically. I'm not at this point convinced that it's not without seeing more data. The rear is another story, it clearly drops off too steep to keep the airflow attached, that needs to be 15-20 degrees tops. You can see the detaching airflow on those youtube videos. So a proper spoiler placed where the curve reaches 15-20 degrees ought to help control it. i'm wondering if the new larger rPod spoiler is an attempt to do that. I'm personally not a fan of FB. If someone is interested enough and finds something useful over there let me know. |
|
1994 Chinook Concourse
1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold |
|
StephenH
podders Helping podders - pHp Joined: 29 Nov 2015 Location: Wake Forest, NC Online Status: Offline Posts: 6326 |
Posted: 31 Aug 2019 at 12:07pm |
I found more benefit when we had the Escape and not as much with the Frontier. This is mainly because it sat closer to the RPod on the Escape and the Frontier, even with the tonneau cover, has the 5' bed space between the AeroPlus and the hitch plus the additional distance between the hitch and front of the trailer. It still helps deflect some of the bugs though.
|
|
StephenH
Happy is the man that findeth wisdom,... ouR escaPOD mods Former RPod 179 Current Cherokee Grey Wolf 24 JS |
|
offgrid
Senior Member Joined: 23 Jul 2018 Online Status: Offline Posts: 5290 |
Posted: 31 Aug 2019 at 12:39pm |
Kinda like a car wing sloped down rather than up? I'm not sure it it would reduce drag or not but it would produce lift at the rear of the trailer. That's a bad thing in a race car but might be good for sway reduction on a trailer.
|
|
1994 Chinook Concourse
1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold |
|
GlueGuy
Senior Member Joined: 15 May 2017 Location: N. California Online Status: Offline Posts: 2654 |
Posted: 31 Aug 2019 at 12:45pm |
|
|
bp
2017 R-Pod 179 Hood River 2015 Ford F150 SuperCrew 4WD 3.5L Ecoboost |
|
podwerkz
Senior Member Joined: 11 Mar 2019 Location: Texas Online Status: Offline Posts: 966 |
Posted: 31 Aug 2019 at 3:00pm |
I watched those airflow videos....the one with the spoiler apparently shows that spoiler down farther, and farther away from the A/C unit than I see on the roof of my r-pod.
On my r-pod the spoiler is directly 'shadowed' by the A/C unit and the roof vent cover. This is what I refer to by being improperly placed to improve aerodynamics. It may be that on the longer r-pods, the spoiler sees some undisturbed air...but on mine, I am sure it does not. |
|
r・pod 171 gone but not forgotten!
|
|
offgrid
Senior Member Joined: 23 Jul 2018 Online Status: Offline Posts: 5290 |
Posted: 31 Aug 2019 at 5:25pm |
yah, on the smaller pods you have a pretty short deck. If you don't put the spoiler on before you get to where the roof slope exceeds 15-20 degrees the airflow will separate anyway, so the smaller pods might have a problem there.
I found that software and I'm working on getting some new airflow videos now. I'm using my 179 and Highlander TV. One problem with the models in those videos is that it looks like the Reynolds number might be set too low, allowing for some laminar flow, which we don't have at the speeds and dimensions we're working with. I reset it higher to get rid of that. If anyone wants to fool around with this software, here's the link, its pretty easy to use. The hardest thing is to get a good photo uploaded. Stand way back when you take the picture. You have to use a .bmp not a .jpg and it can't be wider than 1400 pixels. To get rid of the background you can use Paint and carefully cut everything else out so its all white except the trailer and TV. Once you get the profile in you can draw in whatever aero feature you want really quickly. |
|
1994 Chinook Concourse
1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold |
|
marwayne
Senior Member Joined: 25 Oct 2011 Location: Edmonton AB Can Online Status: Offline Posts: 1002 |
Posted: 03 Sep 2019 at 7:21pm |
If you want something done right, do it yourself.
2011 RP172, 2016 Tundra 5.7 Litre, Ltd. |
|
Post Reply | Page <123 |
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |