Go Back  RCU Forums > RC Airplanes > RC Warbirds and Warplanes
Reload this Page >

92.5" Piper L-4 Grasshopper

Community
Search
Notices
RC Warbirds and Warplanes Discuss rc warbirds and warplanes in this forum.

92.5" Piper L-4 Grasshopper

Thread Tools
 
Search this Thread
 
Old 07-25-2014, 10:07 AM
  #26  
glazier808
My Feedback: (1)
 
glazier808's Avatar
 
Join Date: Mar 2009
Location: Honolulu , HI
Posts: 3,985
Likes: 0
Received 3 Likes on 3 Posts
Default

Originally Posted by Prekin
Very powerful Zero. What is the dry weight?

Yes, ive seen some screamers with a g45 up front. I was hoping that using this heavier motor and battery's I would need no nose weight, I've come close. I'm just under 28 lbs, but I'm balanced at 7", and that's too far aft, so I may need a pound of lead to move to 6".
Old 07-25-2014, 12:53 PM
  #27  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

So, where do you have batteries? Under the cowl?

Last evening I completed Grasshopper and try it balance it. Manual said, that C.G. should be 97- 103 mm from leading edge. I set it in 90 mm from L.E. because it should a "school" airplane for my dad. It balances perfectly in this set.
Before I leave my workshop I glued the wing struts.
Attached Thumbnails Click image for larger version

Name:	P7240916.JPG
Views:	152
Size:	1.06 MB
ID:	2017322   Click image for larger version

Name:	P7240917.JPG
Views:	142
Size:	1.04 MB
ID:	2017323   Click image for larger version

Name:	P7240918.JPG
Views:	151
Size:	1.06 MB
ID:	2017324   Click image for larger version

Name:	P7250938.JPG
Views:	170
Size:	1.04 MB
ID:	2017325  
Old 07-25-2014, 01:03 PM
  #28  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

Last day I was very busy. At 7:00 a.m. I went to my workshop to glued some window on L-4, prepared a wing joiner, because the tube was too thin. At 9:00 a.m. I loaded my car and drove to an airfield with my friend. I wanted to made some flights with my Eagle Renegade and since 1:00 p.m .to now (11:00 p.m.) I worked on L-4. Very nice day This build it looks like some race.
Attached Thumbnails Click image for larger version

Name:	DSC07182.JPG
Views:	113
Size:	3.24 MB
ID:	2017327   Click image for larger version

Name:	DSC07222.JPG
Views:	96
Size:	2.97 MB
ID:	2017328   Click image for larger version

Name:	DSC08655.JPG
Views:	85
Size:	877.1 KB
ID:	2017329   Click image for larger version

Name:	DSC08656.JPG
Views:	93
Size:	656.4 KB
ID:	2017330  
Old 07-26-2014, 11:08 AM
  #29  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

Grasshopper is almost done. Today I painted scale engines and drilled holes for scale engine and cooling in the cowl. Other step was placing of receiver, RX batteries, ignition and ignition´s batteries of course. Ignition I put on the floor as manual said and receiver with electronic switch of ignition batteries I put on the floor before servos. RX batteries are on the firewall, I fixed them by a one tie. Ignition batteries I put on the special desk over the receiver.
Attached Thumbnails Click image for larger version

Name:	P7250934.JPG
Views:	104
Size:	1.04 MB
ID:	2017493   Click image for larger version

Name:	P7250935.JPG
Views:	103
Size:	1.05 MB
ID:	2017494   Click image for larger version

Name:	P7250937.JPG
Views:	104
Size:	1.06 MB
ID:	2017495   Click image for larger version

Name:	P7260939.JPG
Views:	96
Size:	1.04 MB
ID:	2017496   Click image for larger version

Name:	P7260940.JPG
Views:	107
Size:	1.05 MB
ID:	2017497   Click image for larger version

Name:	P7260941.JPG
Views:	103
Size:	1.05 MB
ID:	2017498   Click image for larger version

Name:	P7260942.JPG
Views:	121
Size:	1.04 MB
ID:	2017499   Click image for larger version

Name:	P7260943.JPG
Views:	129
Size:	1.06 MB
ID:	2017500  


Last edited by Prekin; 07-26-2014 at 11:22 AM.
Old 07-26-2014, 12:13 PM
  #30  
Joespeeder
 
Join Date: Dec 2007
Location: Davison, MI
Posts: 548
Likes: 0
Received 0 Likes on 0 Posts
Default

Hi Prekin,

I have this same L-4.... Be sure to check your welds on the lading gear. I had one break and one side of the gear hung down as I flew around to burn off fuel. It's a great plane that flies like a Cub. I used a mix on ailerons and rudder I think 50%.

The only issue I've had is the gear. I replaced all the bolts and added lock nuts to everything and then the weld broke.

Have fun !!

Joe

Last edited by Joespeeder; 07-26-2014 at 12:17 PM.
Old 07-26-2014, 12:14 PM
  #31  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

Here you can see the mount of LiPol batteris for ignition. Finally I glued last window and painted black stripes on the tail.
Attached Thumbnails Click image for larger version

Name:	P7260944.JPG
Views:	128
Size:	1.03 MB
ID:	2017536   Click image for larger version

Name:	P7260945.JPG
Views:	125
Size:	1.03 MB
ID:	2017537   Click image for larger version

Name:	P7260946.JPG
Views:	113
Size:	1.04 MB
ID:	2017538   Click image for larger version

Name:	P7260947.JPG
Views:	109
Size:	1.03 MB
ID:	2017539  
Old 07-26-2014, 12:21 PM
  #32  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

Thank you for advices Joe. Where did you set C.G.?
I hade similar idea about the landing gear. I changed all screws and locked by CA glue and chemical lock.
Old 07-26-2014, 01:49 PM
  #33  
Joespeeder
 
Join Date: Dec 2007
Location: Davison, MI
Posts: 548
Likes: 0
Received 0 Likes on 0 Posts
Default

Hi Prekin,

I set it per the manual and it works well.... Here's a big thread on this plane. http://www.hobbyking.com/hobbyking/f...cb8b31d2fd4b69

Joe
Old 07-26-2014, 10:06 PM
  #34  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

Thanks for the link, I´ll check it.
Old 07-27-2014, 02:51 AM
  #35  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

It seems, that I can fly it today. Before few minutes I glued a cockpit struts and strings on the rudder and stab. I don´t use a metal string but I use to make them from special fishing cord for big fishes. I´ve just flown with it on my Eagle Renegade.
Attached Thumbnails Click image for larger version

Name:	P9200242.JPG
Views:	93
Size:	695.6 KB
ID:	2017641   Click image for larger version

Name:	P9200244.JPG
Views:	81
Size:	695.7 KB
ID:	2017642   Click image for larger version

Name:	P7270948.JPG
Views:	91
Size:	1.04 MB
ID:	2017643   Click image for larger version

Name:	P7270950.JPG
Views:	111
Size:	1.06 MB
ID:	2017644   Click image for larger version

Name:	P7270952.JPG
Views:	95
Size:	1.05 MB
ID:	2017645   Click image for larger version

Name:	P7270953.JPG
Views:	89
Size:	1.10 MB
ID:	2017646   Click image for larger version

Name:	P7270954.JPG
Views:	94
Size:	1.09 MB
ID:	2017647   Click image for larger version

Name:	P7270955.JPG
Views:	90
Size:	1.07 MB
ID:	2017648  

Click image for larger version

Name:	P7270956.JPG
Views:	85
Size:	1.04 MB
ID:	2017649   Click image for larger version

Name:	P7270957.JPG
Views:	104
Size:	1.04 MB
ID:	2017650  
Old 07-27-2014, 03:08 AM
  #36  
Lifer
My Feedback: (1)
 
Lifer's Avatar
 
Join Date: Aug 2008
Location: Kansas City, MO
Posts: 4,529
Likes: 0
Received 29 Likes on 28 Posts
Default

Looks great! Looking forward to the flight report.
Old 07-27-2014, 03:16 AM
  #37  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

Be sure Lifer, I´ll also add some short movie. And thanks for kind words.
Old 07-27-2014, 12:01 PM
  #38  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

Flight weight is 5625 g (fuel included)- 12.401 pounds. But I had really bad day. Grasshopper is alright, that´s OK, but when we (me and my dad) came to airfield the weather went wrong. Wind, rain and thunder was coming we were waiting here for 45 minuts but it didn´t look, that it would be better, so we went back to home. The next opportunity for maiden flight will be next weekend.
Another long week of wainting.

Last edited by Prekin; 07-27-2014 at 07:17 PM.
Old 07-28-2014, 09:24 AM
  #39  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

Here is one picture from yesterday. It is last moment when was the sun shining. Here is Grasshopper without dummy engines for now.
The yellow nose- I know that is not historical paint scheme, but this yellow nose could be good mark for my dad. His sense of sight is´nt perfect so he will see L-4 easier with this yellow nose.
Attached Thumbnails Click image for larger version

Name:	DSC07253.JPG
Views:	135
Size:	2.89 MB
ID:	2018014  
Old 07-31-2014, 10:35 AM
  #40  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

Finally I´m back at home and I´ve done Grasshopper. I pasted dummy engine and I made holes for air intake under the covers. After maide I´m going to make scale bazookas.
Attached Thumbnails Click image for larger version

Name:	P7310958.JPG
Views:	105
Size:	648.1 KB
ID:	2018919   Click image for larger version

Name:	P7310959.JPG
Views:	102
Size:	664.8 KB
ID:	2018920   Click image for larger version

Name:	P7310960.JPG
Views:	107
Size:	683.9 KB
ID:	2018921  
Old 08-01-2014, 04:28 AM
  #41  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

This L-4 flies very well. It wasn´t necessary to trim some control channel and it flies on the quater of throttle. Second take-off I made on the half of the power.
Attached Thumbnails Click image for larger version

Name:	P8010969.JPG
Views:	90
Size:	1.85 MB
ID:	2019067   Click image for larger version

Name:	P8010971.JPG
Views:	101
Size:	659.1 KB
ID:	2019068   Click image for larger version

Name:	P8010973.JPG
Views:	99
Size:	2.84 MB
ID:	2019069   Click image for larger version

Name:	P8010974.JPG
Views:	86
Size:	636.0 KB
ID:	2019070   Click image for larger version

Name:	P8010977.JPG
Views:	67
Size:	420.4 KB
ID:	2019071   Click image for larger version

Name:	P8010982.JPG
Views:	86
Size:	293.2 KB
ID:	2019072   Click image for larger version

Name:	P8010984.JPG
Views:	88
Size:	865.6 KB
ID:	2019073  
Old 08-01-2014, 04:44 AM
  #42  
Joespeeder
 
Join Date: Dec 2007
Location: Davison, MI
Posts: 548
Likes: 0
Received 0 Likes on 0 Posts
Default

Congrats Prekin !!

I need to fix my gear and great mine back in the air....

Cool to see other L-4's out there patrolling the skies.


Joe
Old 08-01-2014, 05:35 AM
  #43  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

Thanks Joe, have you got some short movie? I´ll add my one probably this evening.

I´ll made some scale details in cockpit. But now, I see that the throttle bars shloud be more forward but now is too late to remake it.
Attached Thumbnails Click image for larger version

Name:	P7220884.JPG
Views:	88
Size:	1.76 MB
ID:	2019088   Click image for larger version

Name:	P7220885.JPG
Views:	81
Size:	1.76 MB
ID:	2019089   Click image for larger version

Name:	P8010987.JPG
Views:	100
Size:	1.07 MB
ID:	2019090   Click image for larger version

Name:	P8010988.JPG
Views:	126
Size:	1.06 MB
ID:	2019091  
Old 08-01-2014, 06:08 AM
  #44  
Joespeeder
 
Join Date: Dec 2007
Location: Davison, MI
Posts: 548
Likes: 0
Received 0 Likes on 0 Posts
Default

Hi Prekin,

I don't have any video of the L-4.... I have lots of videos you may enjoy though Looky here https://www.youtube.com/user/JoespeederII/videos

I have to fix the L-4 gear and finish my ESM LA7. I will get that one in the air this year if it kills me. I started out the year with 6 which were new or needed to remaiden after a rework and I've been chasing things all year.

I'm down to a WWI Pfalz and the LA7.

Then it's just flying, tuning, and maintenance.

I'm looking forward to seeing your L4 video. I reinforced mine in anticipation of using it as a glider tug.

Joe
Old 08-01-2014, 06:17 AM
  #45  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

I´m not sure, if I understand well but... Are you working on six projects now?
I like the video with Lancaster.
Old 08-01-2014, 06:22 AM
  #46  
Joespeeder
 
Join Date: Dec 2007
Location: Davison, MI
Posts: 548
Likes: 0
Received 0 Likes on 0 Posts
Default

Hi Prekin,

I started the year with 6.... Down to 2... Just the LA7 and the Pfalz haven't had air under their wings.

I'll get there.

Joe
Old 08-01-2014, 06:27 AM
  #47  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

I wish you good luck with your projects. ESM LA-7 is great warbird, and she flies very well as our HK Grasshopper.
Old 08-01-2014, 11:16 AM
  #48  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

Here is link for video as I promised: https://www.youtube.com/watch?v=0XDMIVOROlo
And some other shot.
So, what now? 83" Spitfire or 97" Liberator?
Attached Thumbnails Click image for larger version

Name:	DSC07312.JPG
Views:	90
Size:	1.99 MB
ID:	2019194  

Last edited by Prekin; 08-01-2014 at 11:28 AM.
Old 08-02-2014, 03:50 AM
  #49  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

Another beautiful morning on the airfield. Be careful during landing with your HK Grasshopper. It decelerate very well (very quick), so it is easy to be too slow.
Attached Thumbnails Click image for larger version

Name:	P8020989.JPG
Views:	78
Size:	1.04 MB
ID:	2019325   Click image for larger version

Name:	P8020991.JPG
Views:	77
Size:	1.01 MB
ID:	2019326  

Last edited by Prekin; 08-02-2014 at 03:53 AM.
Old 08-02-2014, 04:03 AM
  #50  
Prekin
Thread Starter
My Feedback: (19)
 
Prekin's Avatar
 
Join Date: Jan 2008
Posts: 2,087
Received 78 Likes on 71 Posts
Default

Here are some more shots from maiden.
Attached Thumbnails Click image for larger version

Name:	1.8.2014 11_47_0004.jpg
Views:	86
Size:	121.0 KB
ID:	2019327   Click image for larger version

Name:	1.8.2014 11_52_0006.jpg
Views:	81
Size:	51.3 KB
ID:	2019328   Click image for larger version

Name:	1.8.2014 11_52_0007.jpg
Views:	83
Size:	57.6 KB
ID:	2019329   Click image for larger version

Name:	1.8.2014 12_12_0001.jpg
Views:	73
Size:	60.2 KB
ID:	2019330   Click image for larger version

Name:	1.8.2014 12_12_0002.jpg
Views:	76
Size:	59.5 KB
ID:	2019331   Click image for larger version

Name:	1.8.2014 12_14_0003.jpg
Views:	74
Size:	71.4 KB
ID:	2019332  


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.