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- This topic has 18 replies, 7 voices, and was last updated 14 years, 6 months ago by George Reinhart.
07/26/2008 at 2:09 pm #40914
Battling work and ADHD all the way, I finally finished the BH. It is a little heavy at 7.7 oz, but will serve well as a trainer and experience builder. Everything seems to be working correctly, and I hope to get it in the air on Tuesday or Wed then if it is still in one piece, take it to Muncie.
Andiamo is Italian for “Let’s Go!”
07/26/2008 at 2:11 pm #46080
Close up of the Smoothie setup.
07/27/2008 at 1:24 am #46081Jim JenningsParticipant
Dohrm, I have been anticipating a look at this model and it was worth the wait! Very nice. It looks like an E-Flight out runner. Are you willing to share the specs with our viewers? What did you cover it with, ect?07/27/2008 at 3:09 am #46082
It is a box stock Bounty Hunter, with a ParkRunner motor. 1380 Kv with a Smoothie timer. Fuse dt for now, but I could put a servo on it if desired.
I covered it with Sig equivilent of ultracote. Battery is a Thunderpower 3 cell lipo, 480 Mah, 11.1 V. 15c cont/22c burst. I have 2 of the batteries you recommended, but only have one with connectors on it at present. [ran out]
It weighs just under 8 oz with the thunderpower battery [7.7 oz] and 8 oz with the other battery.
The wing has 245 sq in, so I hope the thing will glide ok.
I will see if I can get it trimmed out this week, if it lives, it is goin’ to Muncie. I am thinking of strapping it to the hood of the truck for style points.
A club member made the decals. Great job, they look good. I haven’t ever used vinyl decals before, and have never used ultracote before.
WooHoo! Volts and watts and amps!!!!!07/30/2008 at 7:34 pm #46083
First trimming session is over, and everyone lived through the landings. It seems to be an easily trimmable plane. I only took it up to an 8 second motor run, as the wind came up towards the river. [been there, done that already] Based on what I saw in 8 seconds, 20 seconds seems a little bit nuts. I was surprised at the excellent glide with a very nice turn circle. I need to adjust the rudder tab to allow a better way to set it, but other than that, everything is ok.
07/30/2008 at 10:32 pm #46084DAN BERRYParticipant
Good to hear that its a going plane. Its best to keep it out of the water.
Motor runs for these beasts is an issue that needs to be addressed.07/31/2008 at 3:03 am #46085George ReinhartParticipant
Don’t you thimk motor runs are going to end up somewhat self limiting?
At 25 seconds you’re only going to get one flight becuse you don’t get the model back.
Just thimk, O.O.S. in only 25 seconds. Now that’s real performance!
Cheers07/31/2008 at 3:31 am #46086Jim JenningsParticipant
Glad to hear that you survived trimming. This is good stuff, models that can have the power increased a bit at a time, they are quite yet they scream! The max is always 2 min. and the motor run is longer than you want. Does it get any better? With 10 second motor runs we will have a handful of guys racing to the horn praying that they do not make a mistake. We are going to have a great time. 😀08/19/2008 at 5:26 pm #46087
I had four different modelers, all very experienced guys, who looked at my BH, made nice sounds and then said,” It’s a shame that airfoil just isn’t any good. It just won’t glide.”
This one glides! It has [IMHO], an excellent glide. I couldn’t be happier with the glide. ???????????
I am going to build another fuselage, and try to knock beaucoup weight off the plane. I also need to trim the power pattern better. Maybe that will improve the glide! ;^)
Bottom line, if you are thinking of trying this event, don’t be afraid to take a good 1/2A model and slap an electric motor on it. You’ll be glad you did.08/19/2008 at 9:24 pm #46088DAN BERRYParticipant
Airfoil problems? Not that i saw.
I definetly agrre with you re the 1/2A size planes.08/19/2008 at 10:37 pm #46089Dean McGinnesParticipant
That airfoil was developed by Curt Stevens for Hand and Catapult Launched Gliders. It is considered an excellent gliding section. Before my BH was vaporized by a powered DT 🙁 on Monday evening, It too had an excellent glide.08/19/2008 at 11:28 pm #46090CHARLES C GROTHParticipant
What airfoil is that? How thick? Could you post the coordinates?
Chuck08/19/2008 at 11:53 pm #46091
Wow, I don’t know what the airfoil is, and I am pretty sure I am not enough of a rocket scientest to send you coordinates. I can, however, trace the plan airfoil section. There are no real ribs as such, all behind the high point is just geodetic sticks. Really strong wing.
No curve behind the high point at all. Flat line to the TE. Fairly sharp LE, which I found extremely good on my CO2 models.
I don’t have a lot of experience, but I think this form of construction is quite good. It builds fast, and makes a very stiff wing.08/19/2008 at 11:54 pm #46092
Chuck, I would bet a breakfast at the 12th ST Cafe that someone on here can plot the coordinates, I cannot help with that particular chore.08/20/2008 at 12:52 am #46093
The wing has a 6.25″ chord for the main panel. The front of the main spar is 1.75″ aft of the LE. The spar height is 1/2″. [high point] The front of the airfoil is just a nicely rounded leading edge curving down to a fairly sharp LE.
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