RE: DeHavilland Mosquito  
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RE: DeHavilland Mosquito - 9/23/2007 2:24:13 AM   
Alex 51


 

Posts: 28
Joined: 4/24/2007
From: montevideo, MN, USA
Status: offline 		I have completed my moquito. CG, if i am reading you correct 115mm from the leading edge next to the fuselage ??
I installed a twin sync unit into the mosquito. It brings the running engine back to idle if one of the engines die. Works great on the ground and it syncs the engines automaticaly three clicks above idle. I still have the original fuel tanks in the mosquito. I have evo 46's i can get about 6.5 to 7 min out of the tanks at 1/2 throttle, not much time is it anyone out there using the tanks? I used Robart 510 retracts and 1.5 volt bats with a switch for each engine.

(in reply to CAP232AC)
       Post #: 551

RE: DeHavilland Mosquito - 9/23/2007 4:07:26 AM   
j3_av8r


 

Posts: 4
Joined: 1/14/2004
From: Guelph, ON, CANADA
Status: offline 		Hi CAP232,

I did use the JR Hi Torque servos but I think they are overkill (I had them sitting around). The Mossie's gear is shorter than the P-47's and if you use light weight wheels, I would think you could probably do fine with some lighter duty ones. I even removed one of the two springs on the retract units as it didn't seem necessary. With the gear retracting aft, the airflow helps retract them anyway.

Yes, they have 85 deg rotation which is why my gear mounting blocks are deeper into the nacelle and angled forward slightly.

The gear has a bit of play but does not wobble at all (especially compared to what wire gear would do). That is one of the reasons I went to the oleos. It taxies, takes off and lands smoothly with the oleos. And they look so much better!

Another pointer on the rudder mixing...I set it up so it would only add throttle to the required engine and not have any affect on the inboard engine. I didn't want to be able to inadvertently shut the throttle too far and kill the engine if the throttle was near idle.

The Welkin is very cool. The high aspect ratio wing makes for a great performer on modest power. I was actually starting to draw one up hoping to have a one-of-a-kind machine when Marc showed up with this one. Oh well. It did when Best of Show - Military at the NEAT Fair last year.

(in reply to CAP232AC)
       Post #: 552

RE: DeHavilland Mosquito - 9/23/2007 4:10:31 AM   
j3_av8r


 

Posts: 4
Joined: 1/14/2004
From: Guelph, ON, CANADA
Status: offline 		Alex 51,

Yes, the 115 mm is at the fuselage.

The twin sync is a great idea and would have probably saved me from my 1st flight prang. Which unit are you using?

Andy

(in reply to Alex 51)
       Post #: 553

RE: DeHavilland Mosquito - 9/23/2007 4:52:10 PM   
Alex 51


 

Posts: 28
Joined: 4/24/2007
From: montevideo, MN, USA
Status: offline 		Thanks for the info i checked the cg last night and i will need a .65 lb's more that brings the plane to 14.25 lbs. I will need to use flaps on take off and landings big time. The twin sync is made by rc showcase(www.rcshowcase.com). This unit was setup for Futaba 9c tx but they can be programed for any of them i have a spectrum 2.4 and it works great. I had a programing problem when i first got it but it was a instructional error. showcase tec (Bill Wike ) was on top of the problem and helped me solve the problem by sending me a new set of instructions. You can go on line and print out a set of instructions. Also with this unit you can run glow starters.

(in reply to j3_av8r)
       Post #: 554

RE: DeHavilland Mosquito - 9/24/2007 1:51:17 PM   
Hot Rod Todd



Posts: 499
Joined: 10/14/2002
From: Cedar Rapids, IA, USA
Status: offline 		I had no problems setting up the Mossy with my 9C. Just set up a mix on the second throttle channel to match the first. You turn on trim function and there you have it. Make sure you turn off the aux control on the channel you use, or you may find yourself wondering why it changes every time you bump a rotary knob. The rudder mix is also no problem, but you have to decide if you want it to drop a bit of power on one, or bring it up on the other. I have not needed to do this though, since the plane seems to take off well, as long as I have some toe-in set on the gear.

I'm not sure of my exact CG now, but I know it is back of 115mm. My previous model felt heavy, and when landing the elevator started to loose effectiveness. Now that I am back to 117-118 I love the way the plane flies and lands.

I would NOT take off with flaps. Unless you have a shorter runway than normal the extra drag could cause you some problems. I do like them on landing though, since it would be tough to slow the thing down without them.

I put some robart struts on mine, and like it much better than the wire retracts I had. They help to cushion the landing and keep the plane from bouncing. Here's a photo of mine where you can see the type I used. 90 degree retracts are what you want, if you are buying a new set anyway.



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(in reply to Alex 51)
       Post #: 555

RE: DeHavilland Mosquito - 9/24/2007 4:58:25 PM   
CAP232AC


 

Posts: 15
Joined: 11/9/2003
From: Pueblo West, CO, USA
Status: online
quote:

Just set up a mix on the second throttle channel to match the first.


What second throttle channel? I can't seem to find it. I used heli mode on my OV-10 (throttle and pitch curves) to sinc up the throttle curves, but would be unable to use rudder mixing that way. I'll go play with that radio again and see what I can do..

(in reply to Hot Rod Todd)
       Post #: 556

RE: DeHavilland Mosquito - 9/24/2007 5:15:21 PM   
Hot Rod Todd



Posts: 499
Joined: 10/14/2002
From: Cedar Rapids, IA, USA
Status: offline 		You can use any open channel. I don't have the book in front of me, but you just pick an open mix and use the throttle as the master, and the other channel as the slave. For example you could use channel 8, make channel 3 the master. Make sure you turn on trim, and turn off the default switch that enables the channel (in my case it was VRA I believe). The two channels will then match each other. End points can be set seprately on both channels, but the trim and throttle cut should work on both. I don't worry about matching up throttle curves since my engines run close enough. That is one feature I wish I had (like my buddies JR9303). Keep the linkage angles the same and you should have a very close match anyway. I think having the engines perfectly matched at every RPM is a bit overated, as long as they both keep running well.

(in reply to CAP232AC)
       Post #: 557

RE: DeHavilland Mosquito - 9/24/2007 5:45:46 PM   
CAP232AC


 

Posts: 15
Joined: 11/9/2003
From: Pueblo West, CO, USA
Status: online 		Well, I was hoping to edit my last post, but...Anyway, I still can't figure out how to "slave" a channel to throttle. However I figure I can use "throttle needle" to set the curve and just mix in "rudder to throttle" to get my steering mix on channel 3. Then I can "NULL" the channel 8 switch on AUX channel menu. As far as perfect sinc, I agree, they don't need to be absolutly perfect. I don't like the "WA -WA -Wa -Wa" sound they make when not synced perfect though, especialy on my electrics.

Aaron

(in reply to Hot Rod Todd)
       Post #: 558

RE: DeHavilland Mosquito - 9/25/2007 3:57:15 AM   
Alex 51


 

Posts: 28
Joined: 4/24/2007
From: montevideo, MN, USA
Status: offline 		Todd
Nice job on your mosquito I like your struts. I only hope we get some more good days to get mine up. Thanks to all for the great advice i never fly a new plane until I check the forums. I have the cmp 190 that I've been flying this summer. I put a 2300 Super tiger and a perry carb on it. I have been bring it to the fun flys and battle it out with a H9 150 P 47. It make for a good show for everyone.

(in reply to CAP232AC)
       Post #: 559

RE: DeHavilland Mosquito - 10/7/2007 8:12:05 PM   
Robinaire



Posts: 766
Joined: 9/7/2002
From: West Palm Beach, FL, USA
Status: offline 		Hi Charlie. Holiday????? You had one in '89!! (It's my natural mean streak!) I just found this thread, and have a question for all. About 2 years ago, I was contacted by a Western Canadiam chap who was building a humongeous Mossie, I believe it was 144". I was designing a gear for it. He had built one himself, and hoped to put out a kit for the plane, with me building gear. He sent me pics of a Mossie in a museum up there, and much other info. A year or so ago, I had a massive blowup on my "confuser" and lost historical emails and a complete address book. I had been away from the project for a few months due to some production problems, and after I had the crash, I could not remember anything but his first name, which was Jerry, and that his last name was Eastern European! Maybe he reads this, or perhaps someone out there might recognize my brief description. I'm at a loss to know how to find him. I'm getting ready to build another Mossie gear, and wanted to look up some of my earlier general data, especially the full-scale stuff. Anybody out there with "detecting" talent??? Lee Robinson W. Palm Beach, FL

< Message edited by Robinaire -- 10/7/2007 8:15:32 PM >

(in reply to CharlieDelta)
       Post #: 560

RE: DeHavilland Mosquito - 10/11/2007 9:17:28 PM   
Alex 51


 

Posts: 28
Joined: 4/24/2007
From: montevideo, MN, USA
Status: offline 		I seen that mossi one time on a forum I wiil go back to some of the stuff I have saved and get back to you. Do you make the gear for the CMP mossi 71"

(in reply to Robinaire)
       Post #: 561

RE: DeHavilland Mosquito - 11/25/2007 12:50:00 AM   
kahloq



Posts: 1904
Joined: 1/1/2006
From: Fort Collins, CO, USA
Status: offline 		Looking at getting one of these Mossies as I have a spare saito 56 lying around. Two would power this plane decent as many have stated OS 52's work well.
Not sure if I'll get to this plane anytime soon though as a KMP B-25 needs to be built as well as 56" ws F-86 ducted fan jet.
Though, this plane doesnt look too hard to get put together, when i get one, it might get pushed to the front of the line.

(in reply to Alex 51)
       Post #: 562

RE: DeHavilland Mosquito - 1/1/2008 3:59:54 AM   
j3_av8r


 

Posts: 4
Joined: 1/14/2004
From: Guelph, ON, CANADA
Status: offline 		I recieved a PM on how to take advantage of 9303's programming for the Mossie. Here is what I did...

First thing to do is when turning on the TX; hold the ENT button to get into the System Menu. I programmed my Mossie using the Twin E function. This automatically dedicates another channel to throttle without any additional mixing. To activate it, you first need to go to DeviceSEL and inhibit the channel you will use for the second throttle (AUX2 in my case). This is not spelled out in the manual and it took me a while to figure out. Now you go into Wing TYPE and activate the TWIN E function. Go to MATE and select which channel you want to mix (AUX2). Set the trim function to ACT if you want the trim to work to work both throttles. I did this so I can shut them down together. That is all you need for the system menu that is Mossie specific.

Now you can go into FUNCTION LIST menu and set up the throttles. You will now notice that when you go into the menus instead of THR and AUX2, you have RTH and LTH. Pretty slick! Set-up reversing, travel adjustment, etc. as necessary to line up your throttles. Once you get the engines running you can go into THRO CURV. Note that there are now 2 curves; one for LTH and one for RTH. If you want, adjust the curve for LTH to get a more linear throttle response. Once it is set, leave it alone. Now apply the same percentages to the RTH curve. Now start up the right engine and play with the points in the RTH curve to synchronize the right engine to the left. I found that getting the engines to be in reasonably synch across the entire RPM range is important for helping keep the plane going reasonably straight on takeoff. With no fin and rudder in the prop blast, the tail can swing harder than the tailwheel can fight.

When setting up the flaps, you will find that there is considerable elevator trim change as the plane really wants to balloon up. I highly recommend using lots of flap for landing this bird. It gives washout,