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Old 12-02-2019, 08:46 AM   #11
Cougar429
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Re: KMP Harvard 84"


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I can agree with pretty much everything posted here. The Texan/Harvard is a prime example of an extremely short nose moment, typical of round engine craft of that era. Another is Rare Bear, although that is a bit off nominal in any event.

In some cases have replaced the slab style stabs and tail controls in favor of built up to reduce weight and reduce the tendency to warp, (although with yours sheeted and aerodynamic not sure if that an option). Unionville seemed to be notorious for this, along with using some rather thick fuselage bulkheads.

I had to add quite a bit even to my T/F version, to the point I used a metal motor mount and still had to fab a bracket to affix lead to it opposite the jug.

I also agree this one proved to have one of the most wicked stall characteristics of anything I flew.
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Old 12-04-2019, 07:35 PM   #12
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Re: KMP Harvard 84"

Well, taking the advise of the folks on this site, I did some modifications on the Harvard. Prior to starting, it took better than 4 lbs of lead right up at the front of the cowl to make the plane balance. Upon finishing the mods, I now have 2lbs, 7ozs of added weight behind the firewall, similar to the way DannoH did his. I am extremely pleased with how this worked out, and want to thank everyone who gave great info and suggestions. Been a great learning experience for the next warbird.
Thanks again everyone.
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Last edited by RSVenture; 12-04-2019 at 07:41 PM. Reason: spelling error
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Old 12-05-2019, 08:27 AM   #13
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Re: KMP Harvard 84"

Great to hear you were able to work out some of the lead required.

Can't wait to see some pics and vids of this one flying.
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Old 12-05-2019, 12:01 PM   #14
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Re: KMP Harvard 84"

Thanks Cougar. All because of the help of folks on this forum. If they fit, will now swap 2200mAh batteries for 5000's I have on hand. Utilize useful, as opposed to dead weight.
Looking forward to flying it. Unfortunately, weather makes us wait for a few months.
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Old 12-06-2019, 12:07 PM   #15
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Re: KMP Harvard 84"

The On my Top Flite Cessna 182 , electric I moved my balance weight from behind the firewall to a unique way ; in front of the firewall and reduced the total lead by something like over 10 oz. will see if I still have the pictures and post.
I trimmed the bolts down to the locking nuts so no chance of touching the motor. This works well for electric because of no vibration but on a fueled motor the wood mount would have to be built a bit different because of high vibration and harmonics created could cause it to vibrate. The wood is slotted so I can slide back or forth to fine tune balancing.
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Old 12-06-2019, 12:15 PM   #16
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Re: KMP Harvard 84"

Thanks Stegl. As a matter of fact I am right this minute fitting some weight under the cowl in front of the firewall. Looks like it may work and if so will surely help to further reduce the weight.
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Old 12-06-2019, 02:04 PM   #17
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Re: KMP Harvard 84"

And if you can move it foreword further like I did , you end up using much less ; versus on the firewall . Doesn't have to be on the sides , could be top or bottom. To make my square blocks of lead ; I use angle aluminum clamped into a square box , measure the weight of lead pieces I need , melt it with a propane torch in a small stainless steel container as the lead won’t stick and when melted , pour into the mood.

Dan has an excellent idea on the mold shape but if you move that forward into the engine compartment just behind the cowl lip , am sure you could come close to halving the lead weight again versus mounting inside firewall.

With regard to aircraft snap rolling if too slow or tight turns, ( as mentioned) this is usually caused by either neutral wingtip incidence , positive incidence or each wingtip incidence at different amounts. A Robart incidence meter become priceless here when building wings , to set the wingtips at a negative incidence in relation to the incidence at the inner part. That way the centre stalls before the outer wingtips and the tendency to tip stall is reduced. Just one way to do it.

Last edited by stegl; 12-06-2019 at 02:25 PM.
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Old 12-06-2019, 04:25 PM   #18
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Re: KMP Harvard 84"

Also remember that, on round fuselages like the Harvard the fuse itself will blank out part of the rudder when you fly slower and add a little up elevator. The higher the nose gets, the more rudder/fin area is lost.
Wheelie, not 3-point landings and keep a little more power on until you are ready to flair fro landing.
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